Tag: nutrition and respiration

Quizzes (10) Questions (16)

Questions Related to nutrition and respiration

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

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

  1. dried completely.

  2. boiled to make them soft.

  3. soaked in vinegar.

  4. kept moist till they germinate.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To demonstrate respiration, seeds must be alive and metabolically active. Germinating seeds are actively respiring and consume oxygen while releasing carbon dioxide.

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

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.

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The experiment requires an airtight setup to prevent atmospheric CO2 from interfering. KOH pellets are used to absorb the CO2 produced by the germinating seeds, creating a partial vacuum that draws water up the delivery tube.

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

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

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As the germinating seeds respire, they consume oxygen. The KOH pellets absorb the CO2 released. This consumption of gas inside the airtight flask creates a pressure drop, causing the water level in the bent tube to rise.

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

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

  1. Reduction of $O _2$
  2. Reduction of $N _2$
  3. Reduction of $CO _2$
  4. Oxidation of $H _@$
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

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

  1. alcohol

  2. KOH

  3. lime water

  4. iodine solution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

KOH (potassium hydroxide) is used in the experiment because it effectively absorbs carbon dioxide gas, which allows the student to observe the change in pressure.

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

Moll's half experiment is performed to show that

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. Inside

  2. Outside

  3. Whole leaf shows blue coloration

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In Moll's half-leaf experiment, the part of the leaf inside the bottle is deprived of CO2, preventing photosynthesis. The part outside has access to CO2, allowing photosynthesis to occur and starch to be produced, which turns blue with iodine.

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

Path of carbon in photosynthesis was found by using 

  1. Centrifugation

  2. Radio isotopes

  3. Fractionation

  4. Chromatography
Reveal answer Fill a bubble to check yourself
B Correct answer
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.