Tag: nutrition and respiration

Questions Related to nutrition and respiration

Before setting up an experiment to show that seeds release $CO _{2}$ during respiration, the
seeds should be :

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

  1. dried completely.

  2. boiled to make them soft.

  3. soaked in vinegar.

  4. kept moist till they germinate.

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Correct Option: D

Four sets of three precautions to be taken while setting up the experiment to show that $CO _{2}$ is evolved during respiration are given below. Find the correct set of precautions.

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

  1. Airtight setup, delivery tube dips in water in beaker, germinating seeds in flask

  2. Thread holding KOH pellets, airtight flask, delivery tube just above the water level in the beaker

  3. Germinated seeds completely under the water in the flask, experimental setup not airtight, delivery tube above water level.

  4. Delivery tube touching the bottom of the beaker, KOH pellets kept along with germinating seeds at the bottom of the flask, seeds should not germinate.

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Correct Option: B

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

Show answer
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.