Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

Write a brief note on following phase of menstrual cycle. (i) Menstrual phase. (ii) Follicular phase / Proliferative phase (iii) Ovulatory phase (iv) Luteal phase / Secretory phase.

Explain the importance of syngamy and meiosis in a sexual life cycle of an organism.

Identify A, B, C and D in the following table:

Scientific name of the source plant	Drug	Harmful effects/ Human body part affected
Papaver somniferum	A	Depressant/ slows body functions
Cannabis sativa	Cannabinoids	B
Erythroxylon coca	C	D

After a brief medical examination, a healthy couple came to know that both of them are unable to produce functional gametes and should look for an 'ART' (Assisted Reproductive Technique). Name the 'ART' and the procedure involved that you can suggest to them to help them bear a child.

How does the Mediterranean orchid Ophrys ensures its pollination by bees?

After a brief medical examination a healthy couple came to know that both of them are unable to produce functional gametes and should look for an 'ART' (Assisted Reproductive Technique). Name the 'ART' and the procedure involved that you can suggest to them to help them bear a child.

Name the cells, HIV (Human Immunodeficiency Virus)gains entry into after infecting the human body. Explain the events that occur in these cells.

What is Graafian follicle?

Tallness in pea plant is a dominant trait, while dwarfness is the alternate recessive trait. When a pureline tall is crossed with a pureline dwarf, what fraction of tall plants in F, shall be heterozygous? Give reasons.

What is meant by the following:
Somaclones.