Scientists and Their Contributions

Q.

Explain how would you show that exhaled air has more carbon dioxide than inhaled air?

Q.

Which of the following does not affect the rate of transpiration?

1. Light

2. Humidity

3. Wind

4. Age of Plant

Q. The mode of nutrition in which organisms make food by themselves is known as ____ nutrition.

1. parasitic
2. autotrophic
3. saprotrophic
4. heterotrophic

Q. Who described leaves as the organ of transpiration?

1. Von Helmont
2. Stephan Hales
3. Inghenhouz
4. Priestley

Q.

Assertion: The leaves of plants take in water constantly in the form of water vapor (which goes into air).
Reason: Plants undergo the process of transpiration.

1. Assertion is True, Reason is True; Reason is a correct explanation for Assertion.

2. Assertion is True, Reason is True; Reason is NOT a correct explanation for Assertion.

3. Assertion is True, Reason is False.

4. Assertion is False, Reason is True.

Q.

6 Tick the correct statement.

(i) Both inhaled and exhaled air contains oxygen.

Q. Von Helmont described leaves as the organs of transpiration.

1. True
2. False

Q. Which among the following statements are true regarding Stephen Hales experiment?

1. Transpiration process in plants
2. Exchange of gases in plants
3. Leaves are the organs for transpiration
4. Roots are the site for photosynthesis

Q. The organism on/inside which parasites live and obtain nutrients from is known as the ______ .

1. host
2. partner
3. guest
4. feeder

Q. Priestley hypothesised that air exhaled by animals during breathing could be converted into pure air by plants.

1. True
2. False

Q. According to Von Helmont, soil is the sole factor influencing plant growth.

1. True
2. False

Q. Plants can purify air through photosynthesis.

1. True
2. False

Q.

6 Tick the correct statement.

(ii) Both inhaled and exhaled air contains carbon dioxide.

Q. Sunlight is essential for plant growth.

1. False
2. True

Q. Differentiate between transpiration and translocation.

Q. The loss of water through the stomata of leaves is called

(a) wilting
(b) translocation
(c) transpiration
(d) transportation

Q. Which among the following statements are true regarding Stephen Hales experiment?

1. Transpiration process in plants
2. Exchange of gases in plants
3. Leaves are the organs for transpiration
4. Roots are the site for photosynthesis

Q. Heterotrophs depend on autotrophs for their food.

1. False
2. True

Q. Who described leaves as the organ of transpiration?

1. Von Helmont
2. Stephan Hales
3. Inghenhouz
4. Priestley

Q. According to Von Helmont, soil is the sole factor influencing plant growth.

1. True
2. False

Q. Heterotrophs are self nourishing in nature.

1. False
2. True