Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Kanchan went to a garden and saw some flowers which were closed. She assumed that those flowers must be buds. But she was astonished to see that all the flowers of that plant were closed and none of them was open. She was confused and asked her queries to her teacher.

1. What do you think, are there any plants with closed flowers? Give an example.
2. Are such plants get pollinated? Explain.
3. What are such flowers/ plants called?
4. What values are shown by Kanchan?

The method developed by Eli Lilly using R-DNA technology has received great support from diabetic patients. Explain, how?

How do accessory glands in man help in semen formation and reproduction process?

Tobacco smoking, chewing or snuffing is very injurious to health of humans. Justify.

To maintain the continuity of its life, Plasmodium protozoa requires both mosquito and human hosts.” Explain.

Choose any three microbes, from the following which are suited for organic farming which is in great demand these days for various reasons. Mention one application of each one chosen.
Mycorrhiza; Monascus; Anabaena; Rhizobium; Methanobacterium; Trichoderma.

From what you have learnt, can you tell whether enzymes are bigger or DNA is bigger in molecular size? How did you know?

A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.
Suggest a technique that can help the couple to have a child where the problem is with the male partner.