What is the sliding filament model of movement of muscles? How does the sliding movement occur at molecular level?

Answer the following briefly:

i) Why don’t Paramecium and jelly fish have a circulatory or respiratory system?

ii) Mention any two functions of plasma proteins.

iii) How does sex determination take place in birds?

iv) Why does a mouse looking for food use upto thirty times more energy than a lizard of the same weight?

Effect of gastric hormones

How would you describe senescence? Write down its different types with bried. description and how it can be regulated in plants?

Red drop

Cardiac output

Percentage Water potential (PWP)