Which are the external conditions required for seed germination?
Which are the external conditions required for seed germination?
The correct option is C Oxygen, moisture and suitable temperature
Conditions
necessary for germination:
Water, air and suitable temperature are necessary for seed germination.
Water is necesssary for germination
because food is stored in the seeds in dry condition, but the developing embryo
cannot utilize this dry food. Food can be utilized in liquid form only and
seeds can utilize only dissolved oxygen. Excess water stops germination because
once all the dissolved oxygen is utilised by the seed, further germination is
not possible as the life supporting oxygen is now lacking.
During germination rapid cell
division takes place. Energy is required for cell division. This energy is
obtained from oxidation. The oxygen required for oxidation is supplied by the
air. So, air is necessary for seed germination.
Suitable temperature is necessary
because low temperature retards the embryo activity and high temperature
destroys the delicate embryo tissue.
So, the correct answer is 'Oxygen, moisture and suitable temperature'
Conditions necessary for germination: Water, air and suitable temperature are necessary for seed germination.
Water is necesssary for germination because food is stored in the seeds in dry condition, but the developing embryo cannot utilize this dry food. Food can be utilized in liquid form only and seeds can utilize only dissolved oxygen. Excess water stops germination because once all the dissolved oxygen is utilised by the seed, further germination is not possible as the life supporting oxygen is now lacking.
During germination rapid cell division takes place. Energy is required for cell division. This energy is obtained from oxidation. The oxygen required for oxidation is supplied by the air. So, air is necessary for seed germination.
Suitable temperature is necessary because low temperature retards the embryo activity and high temperature destroys the delicate embryo tissue.
So, the correct answer is 'Oxygen, moisture and suitable temperature'
