Reproductive Health — BIOLOGY STD 12 Science — Question

Enumerate the factors which are necessary to maintain good health.

1. Explain the development of female gametophyte from a megaspore mother cell in an angiosperm.
2. Draw a leballed diagram of a fully-developed embryo sac.

OR

1. Describe the process of megasporogenesis in angiosperms, until 8-nucleate stage.
2. Draw the labelled structure of mature embryo sac.

What is DNA finger printing. Who discovered it. Write the DNA finger printing process. Writes its uitility.

Explain the ill effects of drug and alcohol use in adolescence and tell about its preventions and control.

How are sewages treated in sewage treatment Plant? Explain.###Explain the different steps involved during primary treatment phase of sewage.

How many different types of gametes could result from each of the following genotypes? What will be their genotypes?

1. Aa.
2. AABB.
3. AaBb.
4. EeCc.
5. FFIIJj.

Ramesh is a small scale farmer and holds 2.5 acres of land. He would like to increase the yield in his farm. Rahul, a student of MSc. (Agriculture) advised him to go to the agricultural department centre of his locality to get biofertilisers according to the variety of the crop. He also suggested Ramesh to stop the use of chemical fertilisers.

1. Explain the term biofertilisers.
2. Name the biofertiliser that is used mostly in paddy fields.
3. What are the values shown by Rahul?

Answer the following questions:
Draw a labelled diagram of a sectional view of human seminiferous tubule.

(i) Define translation.
(ii) Explain the translation process.
(iii) Draw a labelled diagram of the translation.

What is the role of animal husbandary in human welfare? Explain with examples.