Our Precious Environment

How do animals and plants grow?

• Plants and animals need air, water, light and nutrition to grow.

• Green plants uses Photosynthesis process to create energy for survival and growth.

• Since plants create their own energy, they are the first link in the food chain.

• Animals need to drink water and eat plants and other animals to get energy.

• So animal are in the nest steps in the food chain.

How do plants get food

• Plants produce their own food except few pants which eats other organism.

• Green plants use water, nutrient and chlorophyll to produce their food.

• Mainly water and nutrients are absorbed from the ground through their roots. Some plants, however, have developed other methods.

How do plants get food

What happens to plants if there is no light?

• In absence of light, plants shed their leaves and die, leaving only their roots and stem.

What is photosynthesis

• Photosynthesis occurs in chloroplast inside green leaves.

• water (HO) is supplied through roots into leaves• Carbon dioxide (CO₂) is absorbed from air into

leaves.• Both these are broken down into 3 elements–

Hydrogen(H), Carbon (C) and Oxygen(O) with help of chlorophyll and sunlight.

• Thus, plants build glucose and releases oxygen.

What is photosynthesis

What is the food chain

• Plants develop energy through photosynthesis.

• They are eaten by a consumer.

• That consumer is often eaten by another consumer.

• This called food chain.

• For example– grass-cow-man.

What is the food chain

Broad classification of plants

Plants can broadly divided into 2 divisions—

• Plants with chlorophyll

• Plant without chlorophyll

Are bacteria and viruses plants or animals?

• Bacteria are single-cell organism without the cell nucleus.

• Viruses are only nucleic acid molecules.

So they are neither animals nor plants because

Animals are multicellular organisms.

Plants always have nucleus.

bacteria and viruses

• Bacteria • Viruses

How do plants reproduce

Plants reproduce in various ways—

• Many species build side shoots, from which plats grow.

• Plants like mosses and ferns reproduce with the help of spore, which are distributed by wind and grow to become new plants.

How do plants reproduce

• Plants with seed, has male and female organ. The male organ has pollen. These pollen sticks to the stigma and is passed onto the egg cell in the ovary. A fertilized egg ripens to become fruit. Theses fruits have seeds. When seeds are dispersed on soil, they again becomes plants or trees.

How do plants reproduce

Different types of soils

1. Soil Type: Sandy

• Sandy soil has the largest particles among the different soil types.

• It is dry and gritty to the touch,

• Because the particles have huge spaces between them, it can’t hold on to water.

Different types of soils

• Sandy Soil

Different types of soils

2. Soil Type: Silty

• Silty soil has much smaller particles than sandy soil so it’s smooth to the touch.

• When moistened, it’s soapy slick.

• Silty soil retains water longer, but it can’t hold on to as much nutrients

• Silty soil is cold.

Different types of soils

Soil Type: Silty

Different types of soils

3. Soil Type: Clay• Clay soil has the smallest particles

among.• It has good water storage qualities. • little air passes through its spaces.• Because it is also slower to drain, it has

a tighter hold on plant nutrients. • Clay soil is thus rich in plant food for

better growth.

Different types of soils

Clay