From the list given below,select the character which can be acquired but not inherited.

What are the three ways which can produce variant genotypes in the environment?

An angiosperm plant having red coloured flowers when crossed with another having the same colour produced $40$ progenies,out of which $30$ plants were with red coloured flowers and $10$ plants were with white coloured flowers. Find out:
$(a)$ What is the possible genotype of parent plants?
$(b)$ Which trait is dominant and which is recessive?
$(c)$ What is this cross called and what is its phenotypic ratio?

What are fossils? How are they formed? Describe in brief two methods of determining the age of fossils. State any one role of fossils in the study of the process of evolution.

$A$ basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?

In peas,a pure tall plant $(TT)$ is crossed with a short plant $(tt)$. The ratio of pure tall plants to short plants in $F_2$ is