Pyramid of energy is always upright. Give reason.

mRNA is short lived. Give reason.

Question based on paragraph A class of students was taken on an excursion by the school to the banks of a river. They were explained that energy can be transferred from phytoplanktons to humans. This pattem of energy in the ecosystem could be explained as a ‘pyramid of energy’. The pyramid of energy consists of phytoplanktons at the bottom, followed by three successive trophic levels consisting of zooplanktons, fishes and humans respectively. There is a gradual decrease of energy and number of organisms from the base to the apex of the pyramid. The passage of energy is referred to as ‘one way’ transport. Based on the above passage, answer the question Why is the pyramid of energy always upright?

The pyramid of _________in sea is always inverted.

Question based on diagram Draw 'pyramid of energy in an aquatic ecosystem'.

Heart in fishes is known as venous heart. Give reason.

Archaeopteryx is a connecting link. Give reason

Birds are uricotelic in nature. Give reason.

Camel excrete concentrated urine. Give reason.

Answer the following: Hadrocentric and leptocentric vascular bundles are always closed. Give reason.

DNA strands considered as antiparallel, Give reason.