The following image suggests the test done to confirm the necessity of ___ for photosynthesis.

chlorophyll

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carbon dioxide

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water

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all of the above

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Solution

The correct option is A
chlorophyll

The leaf shown in the above image is a variegated leaf where chlorophyll is present only in some parts of it. The area where chlorophyll is present, only that part is blue-black when tested for the presence of starch. The area where chlorophyll is absent shows brown colour. The colours confirm the presence of starch which is an end product of photosynthesis. This experiment confirms that chlorophyll is a must for photosynthesis.

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Q. Which of these is/are required for photosynthesis?

(a) Chlorophyll
(b) Sunlight and water
(c) Carbon dioxide
(d) All of these

Select True or False in the following statements regarding photosynthesis and respiration.

1. Photosynthesis occurs only in the presence of chlorophyll.
2. Photosynthesis occurs at all time.
3. Respiration uses carbon dioxide and water.
4. In respiration carbon dioxide is released as end product.

During Photosynthesis chlorophyll containing cells use carbon dioxide and water to produce:

The autotrophic mode of nutrition requires

(a) carbon dioxide and water.

(b) chlorophyll.

(d) all of the above.

What is needed for photosynthesis in which carbon dioxide and water react in the presence of chlorophyll to produce glucose and oxygen?

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