There are two conical flasks A and B. Flask A has soaked seeds, while flask B has boiled dead seeds. What is the aim of this experiment?

To show that water is essential for the germination of seeds

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To show the utilisation of oxygen in respiration

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To show that chlorophyll is important for plants

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To show the utilisation of carbon dioxide in photosynthesis

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Solution

The correct option is B To show the utilisation of oxygen in respiration
The potassium hydroxide (KOH) solution is kept in flask A and B to check the presence of carbon dioxide $(C O_{2})$ , as KOH can absorb $C O_{2}$ , if produced. When the process of respiration takes place in flask A, the oxygen $(O_{2})$ present in the flask is consumed. The $C O_{2}$ produced due to respiration is absorbed by the KOH present in the flask. Hence, a space is developed due to the consumption of oxygen and thus, the coloured water rises in the tubing of flask A. In flask B, the boiled beans soaked in disinfectant are kept because the boiled seeds are dead and cannot respire. Therefore, the process of respiration does not take place in flask B. The colured water rises in flask A because of respiration. The catabolic process of releasing energy from simple sugars for carrying out life processes is known as respiration.

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Q. The seeds respirate at the time of germination. While showing this experiment a test tube with

K O H

is kept in the conical flask to ______

Q. If soaked pea seeds are kept in three separate flasks, they would germinate best in the flask containing __________.

In the arrangement, flask (A) contains germinating bean seeds and flask (B) has dead boiled seeds with some antiseptic. Wet cotton provides water to both samples. A small tube containing soda lime is suspended in each flask for absorbing carbon dioxide.

What will happen when a burning paper is introduced into each flask after removing their corks?

Q. For experiment showing that

C O_{2}

is evolved during the process of respiration in plants - arrange the steps sequentially.

i) Soak gram seeds in water, overnight. Keep them in conical flask.
ii) Close the conical flask with cork fitted with 'U' tube.
iii) Insert test tube with KOH solution in the conical flask.
iv) Keep the set steady for some time.

Q. In the experiment to show that

C O_{2}

is released during respiration', the small test tube of KOH solution is suspended inside the conical flask to absorb the :
(a) air of the flask
(b) moisture of the flask
(c)

O_{2}

of the flask
(d)

C O_{2}

of the flask released by the seeds

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