Cell: The Unit of Life

NPP PRACTICE PAPER 10

Topic: Cytoskeleton Cilia, Flagella, Microbodies

NCERT Pg. No. (136 – 138,140)

BY:- Baibhav Kumar [NEET BIOLOGY EXPERT]

KUMARLIVE

The Perfect 360 Equation = NPP + NOTES + NCERT (3N Factor)

1. Read the following statements and find out the correct statements.

a) Prokaryotic and eukaryotic flagella are structurally similar

b) Cilia work like oars and comparatively smaller than flagella

c) The core of cilium or flagellum is called axoneme

d) Central tubules are connected by interdobulet bridges and is enclosed by central sheath

e) Central sheath is connected to one of the tubules of each peripheral doublets by a radial spoke. There are nine radial spokes

f) Peripheral doublets are also interconnected by linkers

a. b, d, e, f

b. c, d, e

c. a, b, c

d. b, c, e, f

2. Cilium and flagellum emerge from centriole like structure called

a) Centrosome

b) Kinetochore

c) Basal body

d) Centromere

3. Recognize the figure and find out the correct matching

a) d-plasma membrane, b- radial spoke, a-central sheath, c-interdoublet bridges, f-peripheral microtubules f-central microtubule

b) d-plasma membrane, c-radial spoke, a-central sheath, b-interdoublet bridge, e-peripheral microtubule, f-central microtubule

c) a-plasma membrane, b-radial spoke, d-central sheath, c-interdoublet bridge, e-peripheral microtubule, f-central microtubule

d) a-plasma membrane, c-radial spoke, d-central sheath, b-interdoublet bridge, e-peripheral microtubule, f-central microtubule

4. Fill in the blanks :

1. Centrioles are ---a– structures that lie ---b– to each other

2. Centrioles have an organisaiton like---c–

3. Centrioles are made up of nine evenly spaced peripheral fibrils of ---d--- protein

4. Each peripheral fibril of centriole is ---e–

5. Central part of the proximal region of the centriole is called ----f--- which is proteinaceous

a) a-spherical, b-parallel, c-cart wheel, d-flagellin, e-doublet, f-bridge

b) a-cylindrical, b-perpendicular, c-cart wheel, d-tubulin, e-triplet, f-hub

c) a-cylindrical, b-perpendicular, c-cart wheel, d-tubulin, e-doublet, f-hub

d) a-spherical, b-perpendicular, c-cart wheel, d-tubulin, e-triplet, f-hub

5. Axoneme with 9+2 microtubular arrangement occurs in

a) Cilia

b) Flagella

c) Both a and b

d) Centriole

6. Flagella occur in

a) Eukaryotic cells

b) Prokaryotic cells

c) Viruses

d) Both A and B

7. Membrane bound minute vesicles that contain various enzymes are present in both plant and animals cells called

a) Chloroplasts

b) Centrosome

c) Microbodies

d) Mesosomes

8. Organelle in spindle formation during nuclear division is

a) Centriole

b) Golgi body

c) Chloroplast

d) Mitochondrion

9. The cytoskeleton is a proteinaceous network of fibres in the cytoplasm involved in -

a) Mechanical support

b) Motility

c) Maintenance of cell – shape

d) All

10. Microtubules are made up of -

a) Actin and function in locomotion

b) Tubulin is found in cilia and flagella

c) Myosin and function in contraction

d) Polysaccharide and function in locomotion

11. An organelle with an internal cross section showing characteristic “9+2” morphology is the -

a) Microtubule

b) Microfilament

c) Cilium of flagellum

d) Cytoskeleton

12. The cellular component at the base of each cilium or flagellum is

a) Centriole

b) Nucleus

c) Microvillus

d) Basal Body

13. The cellular structures that are almost like centrioles are -

a) Basal bodies

b) Microfilaments

c) Microtubules

d) Centromeres

14. I cilium / Flagellum contains an outer ring of nine doublet microtubules surrounding two singlet microtubules II. Cilia are smaller which works like oars, causing the movement of either the cells or surrounding fluid III. Flagella are comparatively longer and responsible for cell movement IV. Cilium and flagellum are covered with plasma membrane Which of the above statement is correct ?

a) I, II

b) I, II, III, IV

c) I, IV

d) II,III

15. The core of cilium or flagellum, composed of microtubules and their associated proteins is called -

a) Blepharoplast

b) Axoneme

c) Microfilament

d) Tubulin

16. Section of Cilia / flagella shows -

Peripheral Microtubules (Doublet)

Central microtubules (singlet) Radial spoke Central sheath

a. 9 + 0 2 8 1

b. 9 + 2 9 + 0 9 1

c. 9 2 9 1

d. 3 6 9 1

17. Choose the correct statement about cilia and flagella.

a) They are hair – like outgrowths of the cell membrane

b) Eukaryotic flagella are not structurally different from prokaryotic flagella

c) They originate from basal bodies (centriole like structure)

d) a and c are correct

18. Go through the section of cilia / flagella showing the different parts –In which of the following options correct words for all the blanks A, B, C, and D are indicated ?

a) A – Plasma membrane, B – Interdoublet bridge, C – Central microtubule, D- Radial spoke

b) A – Plasma membrane, B – Arm, C- Central microtubule, D – Radial spoke

c) A- Plasma membrane, B – Interdoublet bridge, C – Hub, D- Radial spoke

d) A – Plasma membrane, B – Interdoublet bridge, C – Hub, D- Arm

19. Centrioles arise -

a) From pre- existing centrioles

b) de novo

c) From nuclear envelope

d) From spherosome

20. Which of the following statement is false ?

a) Both the centrioles in a centrosome lie perpendicular to each other

b) Central proteinaceous hub is missing in a centriole

c) Each centriole has an organization like that of a cartwheel

d) Centrosome usually contains 2 cylindrical centrioles

21. The cross section of a centriole shows

Peripheral Microtubules (Triplet)

Central Microtubules (singlet)

Hub Spokes Inter triplet Bridge

a. 9 2 1 9 9

b. 9 2 9 9 9

c. 9 2 1 2 2

d. 9 0 1 9 9

22. Choose the false statement -

a) Centrosome – Cytoplasmic structure of animal cells

b) Centrioles form spindle poles

c) Centriole – Membraneless, but surrounded by amorphous pericentriolar bodies

d) Centrosome occurs in every animal cells and most of the plant cells

23. Which of the following sequence is correct ?

a) Basal body cilium / flagellum Centriole

b) Cilium / flagellum basal body centriole

c) Centriole Basal body Cilium / Flagellum

d) Basal body Centriole Flagellum / cilium

24.Which of the following is incorrect about the micro bodies ?

a) They are present in bacteria

b) Minute, membranous vesicles

c) They are present in plants and animals

d) They have various enzymes

1. D 2. C 3. D 4. B 5. C 6. D 7. C 8. A 9. D 10. B

11. C 12. D 13. A 14. B 15. B 16. C 17. D 18. A 19. A 20. B

21. D 22. D 23. C 24. A Answer key

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