Tag: experiments on photosynthesis - gases

Questions Related to experiments on photosynthesis - gases

Match List-I with List-II and select the correct answer.

List-I List-II
a. Richnmond lang effect $1$. Reversal of red-drop
b. Emerson effect $2$. Inhabitation of glycolysis by oxygen
c. Pasteur effect $3$. Inhibition of photosynthesis by oxygen
d. Warburg effect $4$. Senscescence retardation in detached leaves
botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

  1. A-$1$, B-$4$, C-$2$, D-$3$

  2. A-$4$, B-$1$, C-$3$, D-$2$

  3. A-$1$, B-$4$, C-$3$, D-$2$

  4. A-$4$, B-$1$, C-$2$, D-$3$

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Correct Option: A

The upper dormant seeds of cocklebur(Xanthium) germinate only under high oxygen levels. The oxygen is required for _______________.

botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

  1. Degradation of inhibitors

  2. Synthesis of promoters

  3. Respiration

  4. Photorespiration

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Correct Option: A
Ingenhousz in an experiment showed that in bright sunlight, small bubbles were formed around the green parts of the plant, while in the dark, they did not. He identified these bubbles to be of ____________.
botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

  1. $CO _{2}$

  2. $H _{2} O $

  3. $O _{2} $

  4. $H _{2} $

Show answer
Correct Option: C
Explanation:

Jan Ingenhousz (1730-1799), in his experiment with an aquatic plant, showed that in bright sunlight, small bubbles were formed around the green parts while in the dark, no such bubbles formed. He found out these bubbles to be of oxygen. He thus, confirmed that purification of air or formation of dephlogiston is carried out by green plants only in presence of sunlight. 

A beaker is filled with water and twigs of Hydrilla are inserted in the funnel so that the cut ends are in the tube of the funnel and the funnel is put in the water. Then a test tube full of water is inverted over the inverted funnel. Air bubbles from the plant collect at the tip of the tube. This experiment demonstrates that oxygen is evolved during photosynthesis. But, if boiled water is used instead of pond water in which Hydrilla grows, then?

botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

  1. Air bubbles are not produced

  2. Air bubbles are produced in large numbers

  3. Only a few air bubbles are produced

  4. Only one air bubble is produced

Show answer
Correct Option: A
Explanation:

If boiled water is used in the test tube, there will be no air bubbles. This is hydrilla cannot survive the high temperature of boiled water. 

So, option A is the correct answer.

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

Show answer
Correct Option: C