what is membrane biogenesis 

Describe the process of nutrition in amoeba.

why does blood not clot inside the body? what happens if a clot develops in the body ?

state the three common features of respiratory organ of animals?

difference between tricuspid and bicuspid valves

What is the difference between isobilateral and dorsiventral leaf? How can we distinguise it from a diagram??

 What is the kreb cycle? It comes in the production of enrgy in humans

 Why are the stomata in most plants more numerous on the lower surface of a leaf instead of being on the upper surface ?

 List the four advantages of transpiration to plants.

1. Give two examples of turgor movements in plants.

Please Explain " K+ ion Concentration Theory "( Mordern Theory ).....:)

difference between the following:-

1. producers and consumers (mode of nutrition)
2. grass and grasshopper (mode of nutrition)
3. chlorophyll and chloroplast (part of plant cell)

 what is thylakoids?