Page 10 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

3. Study the diagram given below and answer the following questions.

(a) Label the image.

Ans:
Open stomata
CO 2

HO
2

O 2

Closed stomata

(b) Name the gases which are exchanged during the opening of stomata.
Ans. Oxygen and carbon dioxide are exchanged during the opening of stomata.

(c) What is the function of guard cells?

Ans. The function of guard cell is to help in the opening and closing of stomata.
4. Name the chemical used to test the presence of starch.

Ans. Iodine is used to test the presence of starch.
5. Name the tissue that helps in conduction of water in plants.

Ans. Xylem helps in the conduction of water in plants.
6. See the image given alongside and answer the following questions.

(a) Name the biochemical process which is being carried out in the image.
Ans. (a) Photosynthesis

(b) Name the pigment present in green plants that helps in carrying out these
process.

Ans. (b) Chlorophyll

(c) Name the plant cell organelle that stores this pigment.
Ans. (c) Chloroplast

7. Name an organic fertiliser.
Ans. Urea

8. Which chemical has the property to absorb carbon dioxide from its surroundings?
Ans. Potassium hydroxide (KOH)

9. Name the bacteria that helps in conversion of atmospheric nitrogen into nitrates.

Ans. Rhizobium
F. Short-answer questions

1. What is the role of stomata in the leaf?
Ans. Leaves take in carbon dioxide from the air through stomata. Stomata are tiny pores

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