Biodiversity, Conservation and Environmental Issues — BIOLOGY STD 12 Science — Question

Differentiate between,
Ovipary and vivipary. Cite an example for each type.

Complete the following chart and rewrite

Hormones	Functions
1. Rapid regeneration of endometrium and maturation of Graafian follicle	————–
2. Secretion of endometrial glands and increased secretion of progesterone	————–
3. Breakdown of endometrium in absence of fertilization	————-

What are the application of genomics?

How and why is the bacterium Thermus aquaticus employed in recombinant DNA technology? Explain.

Give reasons: The middle part of the human sperm is characterized by the presence of a number of mitochondria.

Complete the table based on disorders caused due to under secretion or over secretion of Thyroid gland.

Secretion	Adults	Children
Hypo secretion
Hyper secretion

Describe functional areas of cerebral cortex.

In a series of experiments with Streptococcus and mice F. Griffith concluded that R-strain bacteria had been transformed. Explain.

Ornithologists observed decline in the bird population in an area near a lake after the setting of an industrial unit in the same area. Explain the cause responsible for the decline observed.

Name the stage of human embryo at which it gets implanted. Explain the process of implantation.