Page 7 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

v Remaining nitrates get mixed with the soil and enrich it. This is the reason farmers grow
leguminous crops and non-leguminous crops in alternate manner.

v The process of photosynthesis was first discovered by a Dutch-born British physician and
scientist Jan Ingenhousz.

Exercise

A. Tick (3) the correct answer.
1. The raw material used by plants during photosynthesis includes ......................... .
(a) N and O (b) O , H and CO
2
2
2
2
2
(c) CO and water (d) Water and minerals
2
Ans. (c)
2. Pitcher plant traps insects because it ....................... .
(a) is not an autotroph
(b) grows in soil which lacks in nitrogen

(c) does not have chlorophyll
(d) has a digestive system like human beings
Ans. (a)

3. The simplest form of carbohydrate formed during photosynthesis is ....................... .

(a) Fat (b) Starch (c) Protein (d) Glucose
Ans. (d)
4. How many guard cells are present around the stoma?

(a) 4 (b) 3 (c) 2 (d) 5

Ans. (c)
5. In saprotrophic mode of nutrition, organisms take in nutrients from ....................... .
(a) Fresh green leaves (b) Soil

(c) Living insects (d) Dead and decaying organic matter

Ans. (d)
6. The bacterium which provides nitrogen to the leguminous plants is ....................... .
(a) Rhizobium (b) Yeast (c) Fungi (d) Lichens

Ans. (a)

7. ....................... is released by plants in the process of photosynthesis.
(a) Oxygen (b) Carbon dioxide (c) Nitrogen (d) Hydrogen
Ans. (a)

8. A mushroom is ....................... .

(a) An autotroph (b) A parasite (c) An insectivore (d) A saprotroph
Ans. (d)

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