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Digestive Glands

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Question

Fill in the blanks by choosing the correct alternative

(vi) Alkaline pyrogallic acid is used for absorbing _______ during experiments on germination (oxygen/carbon dioxide).

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Solution

Answer: Oxygen.

Pyrogallic acid is the chemical which absorbs oxygen. This chemical is used to absorb the oxygen present in the conical flask in which seeds were kept for germination. In the absence of oxygen, the seeds fail to germinate

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Similar questions

Q. Why is some KOH placed in a small test tube in the flask with germinating seeds in the experiment to demonstrate occurrence of respiration in germinating seeds?
(1) To provide oxygen required by the seeds for respiration.
(2) To absorb carbon dioxide and create partial vacuum in the flask.
(3) To absorb water from the seeds to make them dry.
(4) To make the air present in the flask alkaline.

Q. In the experiment to show that carbon dioxide is produced during respiration by germinating seeds, the alkali solution kept in a small test-tube absorbs:

(1) only O₂ gas

(2) only CO₂ gas

(3) both O₂and CO₂ gases

(4) neither O₂nor CO₂ gases

Q. Fill in the blanks choosing the correct word from those given below.
one, two, carbon, oxygen, compound(s), element(s), gas, symbol, formula, atom(s), molecule(s)
CO₂ is the _______________ of a gas called carbon dioxide, It represents one ___________ of the _______________. This compound is made up of ______________and _______________. Each molecule contains one ______________ of carbon and _________________of _______________. The _____________ C represents one ______________ of while the _______________ O represents one ________________ of ______________.

Q. In an experimental set up to prove oxygen is required for seed germination, alkaline solution of pyrogallol is used. Which of the following is a correct reason for using it in the experiment?

Fill in the blanks by choosing the correct alternative

(iv) Germination in pea is _______ (epigeal/hypogeal).

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Digestive Glands

Standard X Biology

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