Comment upon the following:
The urine is slightly thicker in summer than in winter.

Comment upon the following All flesh is grass.

Comment upon the following: Gametes are always haploid.

Comment upon the following : Transpiration is a necessary evil.

Comment upon the following: Twins may or may not be identical.

Comment upon the following : When a plant cell is kept in hypertonic solution, it becomes flaccid.

Comment upon the following: In eye transplantation, cornea is grafted.

Comment upon the following : RBCs burst when kept in distilled water.

Comment upon the following: At the time of birth, the testes descend down into the scrotal sac.

Comment upon the following: Blood entering the kidney has more glucose than the blood leaving the kidney but urine contains no glucose.

Give reasons for the following facts: Some plants flower in summer and some in winters.