Answer very briefly.
1. What is nastic movement?
 |
| Tropic movement |
Non - directional response of a plant or part of a plant to stimulus is called nastic movement.
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)Root
b)Shoot
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3. Differentiate phototropism from
photonasty.
| Phototropism | Photonasty |
| 1. Unidirectional movement of a plant part to light stimulus is called phototropism. | 1. Non-directional movement of a plant part in response to light stimulus is called photonasty. |
| 2. It is growth dependent. | 2. It is growth independent. |
| Eg:The growth of a shoot in the direction of light. | Eg:The folding and unfolding of dandelion to light. |
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4. Photosynthesis converts energy X into
energy Y.
a) What are X and Y?
Answer:
X-Light energy
Y-Chemical energy
b) Green plants are autotrophic in their
mode of nutrition. Why?
Ans: Because they prepare their own food materials through a called photosynthesis.
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5. Define transpiration.
1. The loss of water in the form of water vapour from the aerial parts of the plant body is called as transpiration.
2. There are three types of transpiration.
a. Stomatal transpiration
b. Cuticular transpiration
C. Lenticular transpiration
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6. Name the cell that surrounds the stoma.
 |
| Guard cells |
Ans: 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:
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4. What is chlorophyll?
A green pigment, present in all green plants and in cyanobacteria, which is responsible for the absorption of lights to provide energy for photosynthesis.
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5. Name the part of plant which shows
positive geotropism. Why?
Ans: Roots
The roots grow downwards towards gravity to provide stability for theplant.
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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?
 |
| Thigmonasty |
| Movement of sunflower | Movement of Mimosa pudica |
| Photonasty | Thigmonasty |
| The movement of a plant part towards light. | The movement of a plant part in response to touch. |
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7. Suppose you have a rose plant growing
in a pot, how will you demonstrate
transpiration in it?
1. Take the small potted rose plant.
2. Cover a branch with a transparent polythene bag.
3. Tie its mouth around the base of the branch.
4. Leave the plant in sunlight for an hour or two.
5.It is observed that, drops of water will soon appear on the inner side of the bag due to transpiration.
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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?
Ans:
a)gravity
b)light
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Answer in detail.
1. Differentiate between tropic and nastic
movements
2. How will you differentiate the different
types of transpiration?
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