Electricity — Science STD 10 — Question

The focal length of the eye lens increases when eye muscles.

For evolution to occur in a population, which of the following must happen?
i. The frequencies of some alleles in an organism's genotypes must change during its lifetime.
ii. The frequencies of each allele in an organism's genotype must remain constant within its lifetime.
iii. The frequencies of some alleles in a population’s gene pool must change over successive generations.
iv. The frequencies of each allele in a population's gene pool must remain constant over successive generations.

Chlorine reacts with saturated hydrocarbons at room temperature in the:

The ability of the eye lens to adjust its focal length is called :

Refraction of light in the eye occurs at:

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be-

Hydroelectric power plant is :