Page 12 - Science Class 07

Saprophyte : Organisms which obtain food from dead and decaying bodies of plants or
animals

Parasites : Organisms that thrive on or inside the body of another animal or plant and
obtain food from its body
Symbiotic : Two different organisms which depend on each other for nourishment
Insectivorous : Organisms which feed on insects

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i All the living organisms including plants need nutrition.
i Healthy food is one of the most important parts in leading a healthy life.
i Important components of food are carbohydrate, fat, vitamins, minerals and proteins.
i The term photosynthesis is made up of two words namely ‘photo’ means light and
‘synthesis’ means to combine.
i There are two modes of nutrition—autotrophic nutrition and heterotrophic nutrition.

i Heterotrophic plants do not have the capacity to produce enough food to sustain them.
i Mushroom, yeast, moulds, etc. are the examples of saprohytes; cuscuta is the example of
parasite; algae and fungi are the examples symbiotic organisms.
i Pitcher plants, sundew, venus flytrap and bladder wort are the examples of insectivorous
plants.

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A. Tick (3) the correct op on.
1. Which of the following substances combines with carbon dioxide (CO ) to form glucose
2
during photosynthesis?
(a) Oxygen (b) Hydrogen
(c) Nitrogen (d) None of these
2. Which parts of the plant generally make food for the plants?
(a) Roots (b) Stems

(c) Leaves (d) Flowers
3. Which of the following is not a saprophyte?
(a) Mushroom (b) Yeast
(c) Nitrogen (d) Cuscuta

4. Which of the following is not an insec vorous plant?
(a) Sundew (b) Venus Flytrap
(c) Pitcher Plant (d) Algae

12 Science-7