Explain any three advantages that seeds offer to angiosperms.

Name and explain the role of the inner and middle walls of the human uterus.

A colour-blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.

Mendel published his work on inheritance of characters in 1865, but it remained unrecognized till 1900. Give three reasons for the delay in accepting his work. 

Women are often blamed for producing female children. Consequently, they are ill-treated and ostracized. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?

Name the tropical sugar cane variety grown in South India. How has it helped in improving the sugar cane quality grown in North India?

27.

Identify ‘a’, ‘b’ and ‘c’ in the following table:

No.	Crop	Variety	Insect Pests
1.	Brassica	Pusa Gaurav	(a)
2.	Flat bean	Pusa Sem 2 Pusa sem 3	(b)
3.	(c)	Pusa Sawani Pusa A-4	Shoot and fruit borer

Why are beehives kept in a crop field during flowering period? Name any two crop fields where this is practiced.

How did the process of RNA interference help to control the nematode from infecting the roots of tobacco plants?

Explain the process of DNA replication with the help of a schematic diagram.