Answer:
In males primary spermatocytes undergo two meiotic divisions. First meiotic division give rise to two secondary spermatocytes and secondary meiotic division give rise to four spermatids from two spermatocytes.
Therefore a. from 100 primary spermatocytes 400 sperms will develop (100*4= 400)
.
b. From 100 secondary spermatocyteS 200 sperms will develop(100*2= 200).
c. Spermatids do not undergo any further division rather they undergo differentiation to form mature sperms. Therefore from 100 spermatids, 100 mature sperms will develop.
d. One primary oocyte gives rise to one secondary oocyte and one secondary oocyte give rise to one mature ova so only one mature ova will develop from 100 primary oocytes.
e. 100 ova will develop from 100 secondary oocytes.
f. Polar body do not develop into ova and degenerates after some time so no ova will develop from 100 polar bodies.
what might be this meaning of dis question?
The answer is A. melting. The change from gas to liquid to solid will release energy and the change from solid to liquid to gas will absorb energy. So the other three are releasing energy.
Answer: Option D.
Generating electricity.
Explanation:
Natural resources refers to substances that are exist in nature which can be exploited and use for human benefits.
Natural resource like water, natural gas, uranium and coal are used to generate electricity.
Coal and natural gas are used to generate electricity by combustion.
Hydropower plants use energy of falling water to generate electricity through the moving turbine that rotate which convert the kinetic energy of falling water to electricity.