Human Eye and Colourful World — Science STD 10 — Question

The stimulus of the plant due to certain chemicals is called :

Which of the following is an example of a nonrenewable resource?

Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by:

When the light is very bright, the diameter of pupil :

The colour of scattered light depends on.

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.

Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called :

A garbage bin contains the following articles.Which of the articles can be recycled and used again?