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A high energy reduced compound formed in the light reaction and enter into the dark reaction NADPH₂.

During the day, the chloroplast in the guard cells are able to carry on photosynthesis, so the osmotic pressure in the cell sap of the guard cells is high and water enters the guard cells which lead to an opening of the stomatal aperture. Thus stomatal transpiration can take and CO₂ can also enter the green leaf to enable photosynthesis to take place. So, during day time photosynthesis and stomatal transpiration occurs simultaneously.

Light in which maximum rate of photosynthesis takes place is Red.

When a plant is kept in sunlight, CO₂ released by respiration gets used by photosynthesis to synthesize food. So no carbon dioxide is liberated, and respiration cannot be demonstrated.

1. A light induced reaction which leads to splitting of water is Photolysis of water.

2. A plant that does not perform photosynthesis is Fungus.

3. One of the product of Photolysis of water is oxygen.

4. Chloroplasts are regarded as complete photosynthetic units of plants.

5. AIIP stands for Adenosine diphosphate.

The site of light reaction in the cell of a leaf is Grana.

Source of oxygen given out in photosynthesis is water.

The green colouring matter of the plants is Chlorophyll.

Light screen experiment

The principal site in a green leaf for photosynthesis is Chloroplast.

The adaptations of leaf for photosynthesis are:

(i) A large surface area to absorb water.

(ii) It is positioned at a right angle to the light to get maximum light.

(iii) There are numerous stomata to allow rapid exchange of gases.

(iv) Leaves are thin to allow rapid transport or diffusion of materials.

(i) In the cell organelle called plastids (or chloroplasts).

(ii) Stroma lamellae.

The basic requirements of photosynthesis are:

1. Solar energy from the sun.

2. Green chlorophyll.

3. Carbon dioxide from the air.

4. Water.

The correct answer is (B) Succulents

(i) To demonstrate that sunlight is necessary for photosynthesis.

(ii) Take a potted plant and keep it for 2-3 days in dark to destarch its leaves. Take one leaf and cover it on both sides with two black paper strips, as shown in the diagram, with the help of cellophane tape. Now keep the potted plant in light. After a few hours pluck the leaf and remove the black strips. Boil the leaf in alcohol and wash in water. Test the leaf for starch with iodine solution. The leaf turns blue all over except the region covered with black strips. This shows that the region which did not receive light could not synthesise starch. Thus, light is necessary for photosynthesis.

(iii) Light is necessary for photosynthesis.

(iv) Light supplies energy in the form of photons to split water during tight reaction.

(i) 3-5, 

(ii) Oxygen, 

(iii) Water, 

(iv) Decreases because the temperature drops, 

(v) Increases because photosynthesis increases.