Reproductive Health — BIOLOGY STD 12 Science — Question

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.

Answer the following questions:
Explain the events that occur in a graafian follicle at the time of ovulation and thereafter.

In which way has the study of biology helped us to control infectious diseases?

Illustrate the design of a bioreactor. Highlight the difference between a flask in your laboratory and a bioreactor which allows cells to grow in a continuous culture system.

Explain with an example, where a gene, which carries a major disadvantage in homozygous state, confers an advantage in heterozygous condition.

Mention the biological factors of ecology.

What evidence for biological evolution is obtained from, comparative anatomy? Describe in detail

What is ecological succession? What is climax community? How is climax community established?

Using Punnett square demonstrate the law of independent assortment in a dihybrid cross involving two heterozygous parents.

Describe the structure of a ribosome, taking into consideration, its role in protein synthesis.