Science chapter 19

Answer very briefly. 

1. What is nastic movement? 

Tropic movement

Nastic movement

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2. Name the plant part 

a) Which bends in the direction of gravity but away from the light. 

b) Which bends towards light but away from the force of gravity. 

Answer:

a)Roots

b)Shoot

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3. Differentiate phototropism from photonasty. 

photonasty

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4. Photosynthesis converts energy X into energy Y. 

a) What are X and Y? 

Answer:

b) Green plants are autotrophic in their mode of nutrition. Why? 

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5. Define transpiration. 

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6. Name the cell that surrounds the stoma.

Guard cells

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Answer briefly. 

1. Give the technical terms for the following: 

a) Growth dependent movement in plants. 

Ans:Tropic movement 

b) Growth independent movement in plants. 

Ans:Nastic movement 

2. Explain the movement seen in Pneumatophores of Avicennia. 

3. Fill in the blanks:

4. What is chlorophyll? 

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5. Name the part of plant which shows positive geotropism. Why? 

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6. What is the difference between movement of flower in sunflower plant and closing of the leaves in the Mimosa pudica?

photonasty

Thigmonasty

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7. Suppose you have a rose plant growing in a pot, how will you demonstrate transpiration in it? 

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8. Mention the differences between stomatal and lenticular transpiration 

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9. To which directional stimuli do 

(a) roots respond 

(b) shoots respond?

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Answer in detail. 

1. Differentiate between tropic and nastic movements 

Nastic movement

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2. How will you differentiate the different types of transpiration? 

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