Reproduction in Lower and Higher Plants — BIOLOGY STD 12 Science — Question

What are the various public health measures, which you would suggest as safeguard against infectious diseases?

Discuss the role of healthy ecosystem services as a prerequisite for a wide range of economic, environmental and aesthetic goods and services.
OR
Describe the advantages for keeping the ecosystem healthy.

Prashant's mother is suffering from a disorder for which doctor suggests her to take insulin injections. But his mother declines as she presumes injections are prepared by slaughtering of animals. Doctor smiled and explained him about the genetically engineered human insulin produced these days. He also convinced her to take injections.

1. Name the bacterium that is used to produce human insulin.
2. Name the company that first produced human insulin.
3. Name the disease that is treated by using human insulin.
4. What values are shown by the doctor?

Explain the process of fertilisation in human female, and trace the postfertilisation events in a sequential order up to implantation of the embryo.
OR
Explain the process of fertilisation and implantation in humans.

During the reproductive cycle of a human female, when, where and how does a placenta develop? What is the function of placenta during pregnancy and embryo development?

Discuss about physiological effects and applications of ethylene.

The genetic code is, for the most part, universal, with few exceptions. Explain it by giving the example of mitochondria, the power house of cell.

Anabaena as a biofertilizer

Describe five types of leucocytes, with the help of diagrams. Add a note on their functions.

Malarial parasite ‘Plasmodium’ completes its life cycle in two hosts. Draw its complete life cycle and explain various stages it follows throughout its life.