Tag: importance of light for photosynthesis

Questions Related to importance of light for photosynthesis

A student sets up the apparatus for the experiment to show that $CO _{2}$ is released during
respiration. After two hours he would observe :

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. KOH turning milky

  2. water level rising in the bent tube in the beaker.

  3. water level decreasing in the bent tube

  4. no change in water level in the bent tube.

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Correct Option: B

Seeds that are taken in the flask during respiration experiment must be :

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. Just wet

  2. Boiled

  3. Dry

  4. Germinating

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Correct Option: D

What happens if the process of photosynthesis in plants for the formation of carbohydrate ?

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. Reduction of $O _2$

  2. Reduction of $N _2$

  3. Reduction of $CO _2$

  4. Oxidation of $H _@$

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Correct Option: C
Explanation:
Formation of glucose by the unitlization of 6 molecules of carbon dioxide and 12 molecules of water in presence of sunlight in chloroplast is called Photosynthesis. In this process Water is oxidized (loses electrons) in  and carbon dioxide is reduced(gains electrons).
So, the correct option is 'Reduction of CO2'.

To show that $CO _{2}$ is released during respiration we take

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. Dry seeds

  2. Boiled seeds

  3. Germinating seeds

  4. Wet seeds

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Correct Option: C

In the experiment to show that $CO _{2}$, is given out during respiration the chemical filled in the small test tube is :

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. alcohol

  2. KOH

  3. lime water

  4. iodine solution

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Correct Option: B

Moll's half experiment is performed to show that

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. Light is needed for photosynthesis.

  2. Chlorophyll is needed for photosynthesis.

  3. Oxygen is evolved during photosynthesis.

  4. CO$ _{2}$ is needed for photosynthesis.

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Correct Option: D
Explanation:

CO$ _{2}$ is needed for photosynthesis is shown by Moll's half leaf experiment. In this experiment, only that part of the leaf will show blue color which was present outside the bottle because they are able to take carbon dioxide from the stomata of the leaf.

So, the correct answer is option D.

In Moll's half leaf experiment, only that part of leaf will show blue colour which was ........... the bottle.

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. Inside

  2. Outside

  3. Whole leaf shows blue coloration

  4. None of the above

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Correct Option: B

Path of carbon in photosynthesis was found by using 

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. Centrifugation

  2. Radio isotopes

  3. Fractionation

  4. Chromatography

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Correct Option: B
Explanation:

Calvin cycle is used for the fixation of carbon dioxide to produce glucose. Radioactive isotopes of carbon (C-14) and phosphorus (P-32) was used to trace the path for the carbon assimilation. A photosynthesizing plant does not strongly discriminate between the most abundant natural carbon isotope C-12 and C-14. During photosynthesis in the presence of 14$CO _2$, the compounds formed become labeled with the radioisotope.

So, the correct answer is option B.

During day time, CAM(Crassulacean acid metabolizing): Plants procure $CO 2$ for photosynthesis from ____________.

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. Pyruvic acid

  2. Oxaloacetic acid

  3. Oxalic acid

  4. Malic acid

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Correct Option: A

Given below are assertions and reasons. Point out if both are true with reason being correct explanation (A), both true but reason is not correct explanation (B), assertion true but reason is wrong (C), both are wrong (D).
Assertion. Under conditions of high intensity and limited $CO _2$ supply, photorespiration has a useful role in protecting the plants from photo-oxidative damage.
Reason. If enough $CO _2$ is not available to utilise light energy for carboxylation to proceed, the excess energy may not cause damage to plants

biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

  1. A

  2. B

  3. C

  4. D

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Correct Option: D