New cells generate from (a) bacterial fermentation (b) regeneration of old cells (c) pre-existing cells (d) abiotic materials
(c) According to the biogenic theory, new cells can only arise from pre-existing cells. Only complete cells, in favourable conditions, can give rise to new cells.
Define a taxon. Give some examples of taxa at different hierarchical levels.
What are the steps involved in formation of a root nodule?
Discuss the main steps in the digestion of proteins as the food passes through different parts of the alimentary canal.
Describe the role of liver, lungs and skin in excretion.
How does butter in your food gets digested and absorbed in the body?
What is the difference b/w regenerating cells&pre-existing cells