Mendel observed a contrasting trait in relation to the position of flowers. Mention that trait.

What evidences can suggest that, "Modern human beings have originated in Africa"?

Two pink coloured flowers on crossing resulted in $1$ red,$2$ pink and $1$ white flower progeny. The nature of the cross will be

$A$ woman having blood group $B$ marries a man having blood group $A$ and they have four offspring. Two children have blood group $O$,one has blood group $B$,and one has blood group $AB$. Now,answer the following:
$(i)$ Which blood group is dominant?
$(ii)$ Which blood group is recessive?
$(iii)$ What are the genotypes of the parents?
$(iv)$ Show the possible genotypes and phenotypes of the offspring.

Relative method and carbon dating are the methods to know about evolution.

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