Explain any three advantages that seeds offer to angiosperms.
Seeds offer the following advantages to angiosperms:
(i) Seed formation is more dependable as the reproductive processes like pollination and fertilisation are independent of water.
(ii) The hard seed coat protects the young embryo from harsh environmental conditions.
(iii) Seed have better adaptive strategies for the dispersal to new habitats.
Name the tropical sugar cane variety grown in South India. How has it helped in improving the sugar cane quality grown in North India?
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?
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?
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 |
(b) |
|
3. |
(c) |
Pusa Sawani |
Shoot and fruit borer |
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.
