Human Reproduction — BIOLOGY STD 12 Science — Question

Explain in detail the various reagents of pollination.###How many types of pollination are there? Write a brief note and explain any one abiotic factor of pollination with an example.

Explain why a recessive allele is unable to express itself in a heterozygous state.

Describe the roles of pituitary and ovarian hormones during the menstrual cycle in a human female.

Why do some adolescents start taking drugs. How can this be avoided?

List the various abiotic environmental factors.

Answer the following questions:
Where is morula formed in humans? Explain the process of its development from zygote.

What is called immunity? How many types are there? Describe innate immunity.

Describe the logistic population growth.

Bioreactors are the containment vehicles of any biotechnology-based production process. For large scale production and for economic reasons the final success of biotechnological process depends on the efficiency of the bioreactor.
Answer the following questions w.r.t. the given paragraph:
i. List the operational guidelines that must be adhered to so as to achieve optimisation of the bioreactor system. Enlist any four.
ii. Mention the phase of the growth we refer to in the statement Optimisation of growth and metabolic activity of the cells.
iii. Is the biological product formed in the bioreactor suitable for the intended use immediate? Give reason in support of your answer.