Reproduction in Lower and Higher Plants — BIOLOGY STD 12 Science — Question

Your school has been selected by the Department of Education to organise and host an interschool seminar on "Reproductive Health - Problems and Practices". However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is "too embarrassing."
Put forth four arguments with appropriate reasons and explanation to justify the topic to be very essential and timely.

Match the sex-chromosome complements in Column I with the male/ female organisms in Column II.

S.No	Column I	S.No	Column II
A.	XO	1.	Human male
B.	XX	2.	Male bird
C.	XY	3.	Male grasshopper
D.	ZZ	4.	Female Drosophila
		5.	Female bird

Australopithecus.

What are biofertilizers? Explain what are the different types of biofertilizers with suitable examples.

Enlist human endocrine glands.
Describe the T.S. of thyroid gland and add a note on deficiency of thyroxine

Distinguish between: Autogamy (Self-pollination) – Xenogamy (cross pollination)

Observe figure and answer the following questions.

1. What ecological term is used to describe the DDT accumulation at different trophic levels?
2. List any one effect of DDT accumulation on birds.
3. Will DDT accumulation lead to eutrophication?
4. Does it affect the BOD?
5. Name disease caused by accumulation of any heavy metal.

m-RNA, t-RNA and r-RNA.

List 10 modern day animals and using the various resources available link it to a corresponding ancient fossil. Name both of them.

A child suffering from thalassemia is born to a normal couple. But the mother is being blamed by the family for delivering a sick baby.

1. What is Thalassemia?
2. How would you counsel the family not to blame the mother for delivering a child suffering from this disease? Explain.
3. List the values your counselling can propagate in the families.