Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.

A flower of brinjal plant following the process of sexual reproduction produces 360 viable seeds.
Answer the following questions giving reasons:
How many microspore mother cells must have undergone reduction division prior to dehiscence of another in the above case?

You have a friend whose parents are too indulgent in his/her daily affairs. They think him/her to be still young which makes him/her sad and is upset all the time. As he/she feels that the parents should give him/her opportunity to take independent decision on some issues.

1. Would you support your friend and why?
2. Write the characteristics of this age group.
3. List two curative measures.

Answer the following questions:
Draw a sectional view of human ovary and label the different follicular stages, ovum and corpus luteum.

Describe the human female reproductive system.

Name and state the law that can be derived from this cross and not from a monohybrid cross.

A group of students visited a botanical garden, where they saw fungus growing on roots of higher plants only. They were confused seeing it. Then, their teacher told them that it is an interspecific interaction in which both species can be benefitted.

1. Write the name of this particular association.
2. How both are benefitted from each other?
3. State use of this interaction to a farmer.
4. What values are shown by students?

Correct the following statements:

1. Surgical methods of contraception prevent gamete formation.
2. All sexually transmitted diseases are completely curable.
3. Oral pills are very popular contraceptives among the rural women.
4. In E. T. techniques, embryos are always transferred into the uterus.

Answer the following questions:
Differentiate between gametogenesis in human males and females on the basis of:

1. Time of initiation of the process.
2. Products formed at the end of the process.

Describe the logistic population growth.