What is the name of the reproductive process which involves (i) two parents (ii) only one parent?

Name the agencies through which cross-pollination take place.

Give one word for each phrase:

(i) A sexually transmitted disease caused by a virus.

(ii) The reproductive organ cut and ligated for male sterilisation.

(iii) The biological end of a full term gestation.

(iv) The type of disease to which Trichomoniasis belongs.

Leaves of Bryophyllum fallen on the ground produce new plants whereas the leaves of rose do not. Why?

‘Grafting is a common method of obtaining a superior plant from two different plants’. Explain.

How do the ornamental plants propagate? Mention the method of propagation for the following:

(i) Jasmine (ii) Rose

(iii) Bougainvillea (iv) Hibiscus

Justify the statement ‘Primary sex organs control the growth, function and maintenance of secondary sex organs’.

Why is it said that ‘sexual reproduction promotes, diversity of characters in the offsprings’?

What causes joining up of stock and scion in grafting? Name one positive trait that the plant contributing scion should have and one positive trait that the plant contributing the stock should have.

“DNA copies generated will be similar, but may not be identical to the original.” Explain.

What is a seed? How does it help in reproduction in plants?

Fertilisation is possible if ovulation has taken place during middle of the menstrual cycle. Give reasons.

What changes are noticed on sexual maturity of human beings?

How can the reproductive health be maintained and sexually transmitted disease (STDs) be prevented?

What is meant by tissue culture? How this technique is performed? In which area this technique is finding its application?

Name two bacterial diseases which are sexually transmitted. Name their causal organisms, symptoms and preventive measures.

Due to heavy rise in demand for tea in international market and simultaneous incentive given by government on tea plantation, a tea company wants to go for a large-scale expansion of its tea plantation in Assam. To implement the project, the company need a large number of sapling and a huge motivated work force.

(a) What is the best option for the company to arrange large number of sapling?

(b) What are the minimum facilities that the company should provide to its workers?

(c) What additional step can the company take to motivate the workers to put extra effort into successful expansion of the plantation?