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1.

The root of the plant is ……(i) positively phototropic but negatively geotropic (ii) positively geotropic but negatively phototropic (iii) negatively phototropic but positively hydrotropic (iv) negatively hydrotropic but positively phototropic(a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)

Answer»

(b) (ii) and (iii)
Discussion
2.

Differentiate phototropism from photo nasty.

Answer»
PhototropismPhotonasty
The unidirectional movement of a plant part to light stimulus is called phototropism. It is slow and irreversible.The non-directional movement of a plant part in response to light is called photo nasty. It is immediate, temporary and reversible.
Discussion
3.

Match column A with column BColumn AColumn B1.Roots growing downwards into soil(a) Positive phototropism2.Shoots growing towards the light(b) Negative geotropism3.Shoots growing upward(c) Negative phototropism4. Roots growing downwards away from light(id) Positive geotropism

Answer»

1. (d) Positive geotropism 

2. (a) Positive phototropism

3. (b) Negative geotropism

4. (c) Negative phototropism
Discussion
4.

During respiration plants inhale ……. and exhale ……… (a) Nitrogen and Oxygen (b) Oxygen and Hydrogen (c) Oxygen and Carbon dioxide (d) Carbon dioxide and Oxygen

Answer»

(c) Oxygen and Carbon dioxide
Discussion
5.

Explain the movement seen in Pneumatophores of Avicennia.

Answer»

Negatively Geotropic movement.
Discussion
6.

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

Answer»

The stem of sunflower follows the path of sun from dawn to dusk (from east to west) due to light stimulus. But at night, it moves from west to east. The leaves of mimosa pudica closes on touching stimulus.
Discussion
7.

A plant is kept in a dark room for about 24 hours before conducting any experiment on photosynthesis in order to ……(a) remove chlorophyll from the leaf (b) remove starch from the leaves (c) ensure that photosynthesis occurred (d) to prove transpiration

Answer»

(b) remove starch from the leaves
Discussion
8.

The chemical reaction occurs during photosynthesis is ………(a) CO2 is reduced and water is oxidized (b) water is reduced and CO2 is oxidized (c) both CO2 and water are oxidized (d) both CO2 and water are produced

Answer»

(a) CO2 is reduced and water is oxidized 
Discussion
9.

Differentiate between tropic and nastic movements

Answer»
Trophic MovementsNastic Movements
Unidirectional response to the stimulusNon-directional response to the stimulus
Growth dependent movementsGrowth independent movements
More or less permanent and irreversibleTemporary and reversible
Found in all plantsFound only in a few specialized plants
Slow actionImmediate action
Discussion
10.

What is a food chain?

Answer»

The link in the cycle of relationship between plants,animals and micro organisms are called Food chain.
Discussion
11.

What is nastic movement?

Answer»

Non-directional response to the stimulus is called Nastic movements.
Discussion
12.

How are Photosynthesis by plants and gas exchange by animals interrelated?

Answer»

The oxygen released by the plants is inhaled by the animals. Animals exhale Carbon dioxide, which is taken up by the green plants for photosynthesis. Thus the photosynthesis by plants and the gas exchanges by animals are interrelated.
Discussion
13.

Match the following with the types of Nastic movements in plants:1.Thigmonasty(a)Temperature2.Nictinasty(b)Change in light intensity3.Thermonasty(c)Touch4.Photonasty(d)Darkness

Answer»

1. (c) Touch 

2. (d) Darkness 

3. (a) Temperature 

4. (b) Change in light intensity
Discussion
14.

What is Tropism?

Answer»

Tropism is a growth movement and the direction of which is determined by the direction of the stimulus.
Discussion
15.

Take pea seeds soaked in water overnight. Wait for the pea seeds to germinate. Once the seedling has grown put it in a box with an opening for light on one side. After few hours, you can clearly see how the stem has bent and grown towards the light.

Answer»

Take pea seeds soaked in water.overnight. Wait for the pea seeds to germinate. Once the seedling has grown put it in a box with an opening for light on one side. After a few days, we can clearly see that the stem has bent and grown towards the light. This experiment demonstrates Phototropism.
Discussion
16.

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

Answer»

Green plants are autotrophic in their mode of nutrition because they prepare their food, through a process called photosynthesis by using water, carbon dioxide, chlorophyll and sunlight.
Discussion