Question

Science and Technology 10th Standard Balbharti Practical Note Book.

Science Part 2

Practical Number 12

Multiple Choice Question

Q. 5.) The seeds recipe rate at the time of germination while showing this experiment a test tube with KOH is kept in the conical flask to _____________.
a). seed oxygen is necessary for respiration.
b). create space in the conical flask by absorbing CO2.
c). absorb water from the seed and dry them
d). make the air in the conical flask, acidic.

Answer 1

b. is the ryt answer

Answer 2

Question - The seeds respirator at the time of germination. While showing this experiment a test tube with KOH is kept in the conical flask to _____________.

a). seed oxygen is necessary for respiration.

b). create space in the conical flask by absorbing CO2.

c). absorb water from the seed and dry them

d). make the air in the conical flask, acidic.

Answer - KOH is used in this experiment, because b). create space in the conical flask by absorbing CO2.

•KOH or potassium hydroxide is a compound, which reacts with carbon dioxide and is used in this experiment because of this property.

•It reacts to form potassium carbonate. The carbon dioxide, comes from respiring seeds.

•This causes partial vacuum, which in turn causes rise in water level.

•This experiment confirm respiration of seeds and release of carbon dioxide.