quiz no. 2 from renu educational group
DESCRIPTION
by:- VIJAY SIRTRANSCRIPT
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Present
INTERACTIVE MULTIPLE CHOICE
QUESTIONS
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These multiple choice questions in some cases, there may be more than one acceptable answer.
For this reason, even if you select a correct answer at your first attempt, it is worth looking at all the alternatives (a) to see if there is a better answer and (b) to see why some of the alternatives are unacceptable.
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Test 2
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Hi I am batty your
quiz instructor . I ask you some question . OKR u ready ?
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QUESTION 1
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(a) A food source, oxygen, enzymes, a blood supply
The process of aerobic respiration requires
Question 1
(b) A food source, carbon dioxide, enzymes
(c) Oxygen, enzymes, sunlight
(d) A food source, oxygen, enzymes
Question 2
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Respiration occurs in all living cells including plants, bacteria and single celled organisms, none of which have a blood supply.
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No
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Carbon dioxide is a product of respiration
No
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Sunlight is necessary for photosynthesis but not for respiration
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No
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CORRECT ANSWER
Components of the food source are combined with oxygen, and energy is ‘released’*. Enzymes are catalysts which speed up these reactions
* Most of the energy is used to drive other living processes though some it is released as heat
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Question 2
This organism is classified as an insect because it has
(a) a segmented body
(b) three pairs of walking legs
(c) wings
(d) jointed legs
Question 3
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Insects do have segmented bodies but so do annelid worms such as the earthworm
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No
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This is the single characteristic of those listed that determines that the creature is an insect.
However, you should bear in mind that if asked for a definition of an insect, all the characteristics listed should be included
Yes
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Most insects do have wings but some are wingless e.g. fleas
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No
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Insects do have jointed legs but so do crustacea such as crabs and lobsters
Jointed legs are a feature of the Arthropods, which include insects.
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No
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Question 3
In a plant cell, which structure is responsible for controlling the entry or exit of substances?
(a) The cell wall.
(b) The cell membrane
(c) The nucleus
(d) The cytoplasm
Question 4
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The cell wall is generally regarded as being freely permeable to water and dissolved substances. Its structure does prevent the passage of large molecules such as some proteins but this is not the same as exercising control
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No
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This is the correct answer
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The nucleus does control most of the activities in the cell but does not exert direct control over the entry and exit of substances.
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No
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The cytoplasm is responsible for constructing the cell membrane but does not exert direct control over the entry and exit of substances.
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No
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Question 4
What will be the products of digestion of fish ?
(a) Glucose and amino acids
(b) Glucose, amino acids, fatty acids and glycerol, minerals and vitamins,
(c) Glucose, glycerol and fatty acids
(d) Glucose, amino acids, glycerol and fatty acids
Question 5
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Fish contain fats as well as protein and carbohydrate
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No
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This is largely correct but vitamins and minerals are not digestion products. They are absorbed unchanged.
If vitamins were broken down by digestion they would lose their properties
No
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Fish contain proteins as well as carbohydrates and fats
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No
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Yes
The proteins are digested to amino acids.
The carbohydrates are digested to glucose
The fats are digested to glycerol and fatty acids
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Question 5
A male, homozygous dominant black mouse is mated with a homozygous recessive female brown mouse. The black genotype is BB, the brown genotype is bb. Would you expect the offspring to be
(a) all brown
(b) all black
(c) 50% black and 50% brown
(d) all intermediate in colour?
Question 6
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All the male gametes will carry the dominant allele B.
The female gametes will carry the recessive allele b. This means that the genotype of all the offspring will be Bb.
There can be no brown mice (bb).
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No
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Yes.
All the male gametes will carry the dominant allele B.
The female gametes will carry the recessive allele b. This means that the genotype of all the offspring will be Bb.
Since the allele for black is dominant, all the offspring will be black
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All the male gametes will carry the dominant allele B.
The female gametes will carry the recessive allele b. This means that the genotype of all the offspring will be Bb.
There can be no brown mice (bb).
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No
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If the alleles for black and brown fur were equally dominant (codominant), an intermediate colour might result but because only the black allele is dominant, this is not a possibility
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No
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Question 6
Which of these organisms can be classed as producers in a food chain?
(a) Earthworms
(b) Mosses
(c) Fungi
(d) Trees
Question 7
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Earthworms are near the bottom of a food chain but they are not producers. They are consumers, digesting and absorbing dead organic matter in the soil
No
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No
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Mosses are producers. Although they are simple plants they contain chlorophyll and produce their food by photosynthesis
Yes
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Fungi are not producers. They digest and absorb organic matter in soil, dead wood or other decomposing matter
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No
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Trees are producers. The chlorophyll in their leaves enables them to produce food by photosynthesis
Yes
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Question 7After blood has picked up oxygen in the lungs, what route does it take to deliver it to a muscle in the arm?
(a) Pulmonary artery, left atrium, left ventricle, aorta, subclavian (to arm) artery
(b) Pulmonary vein, left atrium, left ventricle, aorta, subclavian artery
(c) Pulmonary vein, right atrium, right ventricle, aorta, subclavian artery
(d) Pulmonary vein, right atrium, left ventricle, aorta, subclavian artery
Question 8
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The vessels returning blood to the heart are the veins
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No
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This is the correct route. The oxygen will be used in respiration, perhaps to produce muscle contraction
Yes
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The pulmonary vein returns blood to the left side of the heart
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No
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The right and left chambers of the heart are completely separate, Blood cannot cross from one side to the other.
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No
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Question 8
A B
M
A is a weak solution of sugar in water. B is a strong solution of sugar in water. M is a selectively permeable membrane. After a period of time, the solution level will
(d) rise on both sides
(c) remain the same
(b) rise in B and sink in A
(a) rise in A and sink in B
Question 9
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The water molecules in A can move freely. The sugar molecules in B attract a cluster of water molecules which therefore cannot move freely. Water molecules can pass through the selectively permeable membrane in both directions but there are more freely moving water molecules in A than in B
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No
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Yes
The water molecules in A can move freely. The sugar molecules in B attract a cluster of water molecules which cannot move freely. Water molecules can pass through the selectively permeable membrane in both directions but there are more freely moving water molecules in A than in B so more water will pass from A to B than in the other direction. The water level in A will therefore fall, and that in B will rise
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This would happen if the membrane were freely permeable to water molecules and sugar molecules. The membrane, however, is selectively permeable
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No
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You must be joking
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Question 9
Which of these statements is most accurate?
In bright sunlight a green plant will be
(a) photosynthesising only
(b) respiring only
(c) photosynthesising and respiring
(d) taking in oxygen and giving out CO2
Question 10
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In bright sunlight the plant will certainly be photosynthesising, but this is not the only process going on
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No
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Living organisms are respiring all the time. A plant will be respiring in daylight and darkness, but in bright sunlight you would expect photosynthesis to be taking place as well
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No
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Yes
Respiration takes place all the time but in bright sunlight, photosynthesis will be going on as well.
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Respiration uses oxygen and produces carbon dioxide.
Photosynthesis uses carbon dioxide and produces oxygen.
In bright sunlight, photosynthesis will be going on faster than respiration so there would be a net intake of carbon dioxide and a net output of oxygen
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No
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Question 10
The force which carries water up a tree trunk is produced by
(c) osmosis
(b) root pressure
(a) evaporation from the leaves
(d) active transport
Question 11
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Evaporation of water from the leaves (transpiration) produces a ‘water tension’ which ‘pulls’ water up through the xylem vessels in the trunk
Yes
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Root pressure can certainly generate a force that ‘pushes’ water up through the vessels in the trunk but it is not sufficient to account for the rise which takes water to the top of a tree
No
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Osmosis is responsible for creating root pressure but this is insufficient to drive water to the top of a tree
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No
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Active transport is something which happens in cells. It is usually concerned with the cell taking in specific substances. It cannot produce a mass flow of water.
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No
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Question 11
A reflex action occurs when
(a) a stimulus produces a response
(b) a reaction to a stimulus cannot be consciously controlled
(c) the nervous pathway involves only the spinal cord and spinal nerves
(d) the reaction is very rapid
Question 12
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There are many instances where a stimulus produces a response but they do not necessarily involve reflex actions. For example the stimulus of hunger produces the response to seek food. This is a voluntary response.
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No
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Yes.
For example, the ‘knee-jerk’ reflex cannot be consciously suppressed.
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This is true in many cases but not all. The knee-jerk reflex is a spinal reflex but the reflex change of shape in the iris of the eye must have a nervous pathway in the brain.
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No
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Many reflex actions are rapid but others, such as reflex salivation in response to a sour taste, are comparatively slow.
Also many voluntary actions are rapid. Some of the reactions in, for example, badminton are very rapid but they are not reflex actions
No
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Question 12
Pepsin, an enzyme in the stomach, will only work
(d) on proteins
(c) at 45ºC
(b) on carbohydrates
(a) in acid conditions
Question 13
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The stomach secretes hydrochloric acid as well as pepsin. The pH is about 2
Yes
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An enzyme will act only on one specific substrate.
Pepsin will not act on carbohydrates
No
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At temperatures above 40ºC, most enzymes start to be denatured. That is, their molecular structure is altered and they no longer work. Pepsin will work best at body temperature, 36-37ºC
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No
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Pepsin acts only on proteins, breaking them down to smaller molecules called peptides
Yes
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Question 13
A sample of food is heated with Benedict’s reagent. If a red precipitate is formed it shows the presence of
(d) a reducing sugar
(c) glucose
(b) starch
(a) sugar
Question 14
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The red precipitate does indicate that a sugar is present. It does not indicate which one; glucose, sucrose, fructose etc.
Yes
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Starch should not give a red precipitate with Benedict’s reagent although it may produce a cloudy greenish suspension. This is because heating with an alkaline reagent (Benedict’s) starts to break down the starch to sugar
No
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Glucose will certainly form a red precipitate when heated with Benedict’s reagent but so will several other sugars; fructose for example.
In practice, the conclusion that glucose is present would be acceptable.
Yes
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This is the best answer. A ‘reducing sugar’ is one which can ‘reduce’ the copper sulphate in Benedict’s reagent to copper (1) oxide (the red precipitate).
Glucose, fructose, maltose and lactose are all reducing sugars
Sucrose is not a reducing sugar and will not produce a red precipitate with Benedict’s reagent.
Yes
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Question 14
The human population grows if
(a) the death rate exceeds the birth rate
(b) the birth rate and death rate increase
(d) the birth rate exceeds the death rate
(c) people live longer
Question 15
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If more people are dying than are being born, the population will diminish
No
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If birth rate and death rate both increase, the population would remain stable but the age structure of the population would change
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No
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People living longer could increase the population size but unless the trend persisted it is unlikely to sustain a continuing increase in population
No
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This is the principal cause of the growth of a population
Yes
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Question 15
The drawings represent stages in cell division in an animal cell, but in the wrong sequence. Which of the following is the correct sequence?
a b c d e f g
(d) b, e, a, d, c, g, f
(c) b, e, d, a, c, g, f
(b) b, d, e, a, c, f, g
(a) b, e, d, a, c, f, g
Question 16
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Cell constriction (g) occurs before the cells become separated (f)
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No
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The nucleus divides (e) before the cell starts to constrict (d)
No
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This is the correct sequence
Yes
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The cell constricts (d) before the cells become separate (a)
No
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Question 16
The female sex hormone is produced in
(a) the uterus
(d) the liver
(c) the pituitary gland
(b) the ovaries
Question 17
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The uterus does not produce oestrogen
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No
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Oestrogen is produced in the ovaries
Yes
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The pituitary gland releases two hormones. FSH and LH which affect the ovaries’ production of hormones but it does not produce oestrogen
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No
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The liver processes oestrogen prior to its excretion but it does not produce it.
* In fact the liver does produce small quantities of oestrogen but these are insignificant compared with oestrogen produced by the ovaries
No
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Question 17
Which of the following are excretory organs?
(d) The alimentary canal
(c) The sweat glands
(b) The kidneys
(a) The liver
Question 18
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The liver produces bile. The green bile pigments are breakdown products of haemoglobin so they are excretory products. But the production of bile is a response to the presence of food in the duodenum and bile is not specifically formed to dispose of the bile pigments. So their excretion is incidental and the liver cannot be regarded as an excretory organ though it does process some excretory products which are excreted elsewhere
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No
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The kidneys are the excretory organs in the body. They excrete excess water, excess salt, urea and uric acid and the breakdown products of hormones and other unwanted products.
Yes
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Sweat does contain sodium chloride and urea which can be regarded as excretory products. However, the sweat glands come into action in response to a rise in body temperature. The loss of salt and urea is quite incidental to the sweat glands’ function in temperature control. Therefore the sweat glands cannot be regarded as excretory organs.
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No
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The contents of the alimentary canal have never been part of the body, so defecation is not excretion. The bile pigments are excretory products from the liver but their excretion is incidental to the main function of the alimentary canal
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No
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Question 18
Sexual reproduction occurs when
(a) a new organism is formed
(c) mating takes place
(d) male and female gametes meet and fuse together
(b) male and female gametes are produced
Question 19
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A new organism could be the outcome of sexual reproduction but asexual reproduction also produces new organisms
No
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The production of male and female gametes is an essential step in sexual reproduction but does not itself constitute sexual reproduction
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No
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In certain animals, mating may be a part of sexual reproduction but sexual reproduction takes place in plants and a great many other organisms where mating does not occur
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No
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The fusion of male and female gametes is the defining moment in sexual reproduction
Yes
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Question 19The evidence and arguments for evolution by Natural Selection are (not in
logical order)…
(a) These variants live longer and have more offspring,
(b) Organisms in a species tend to vary,
(c) Some variants are better adapted to the environment than others,
(d) Therefore there is a struggle for survival,
(e) Organisms have more offspring than can possibly survive,
(f) If the variations are heritable, the variants will eventually predominate,.
Which of the following represents a logical sequence?
(4) e, b, d, c, a, f
(3) e, d, b, c, a, f
(2) b, a, c, d, e, f
(1) b, d, c, a, e, f
Question 20
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The fact that organisms vary (b) does not necessitate a struggle for survival (d)
The fact that organisms have more offspring than can survive (e) needs to come at an earlier stage in the argument
No
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Because organisms vary (b) does not necessarily mean that they live longer (a). It is only the better adapted variants (c) which live longer (a)
The tendency to have more offspring than can survive (e) must come at an early stage in the argument
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No
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This is the most logical sequence
Yes
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This is a reasonable sequence although the struggle for survival (d) is not necessarily a consequence of variation (b)
Not quite
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No
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Question 20
The DNA molecule consists of a strand of
(f) nucleotides
(e) protein molecules
(b) deoxyribose and phosphate
(a) the bases, adenine, guanine, thymine and cytosine
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These organic bases are present in the DNA molecule but are only part of it
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No
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Deoxyribose and phosphate form the ‘backbone’ of the molecule but do not constitute it
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No
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Protein is present in the chromosomes but not in the DNA
No
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No
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Yes. DNA is made up of a chain of nucleotides
PO4
PO4
bases
Part of a DNA molecule
PO4
PO4
adenine
A nucleotide
deoxyribose
PO4
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