Evolution — BIOLOGY STD 12 Science — Question

If implementation of better techniques and new strategies are required to provide more efficient care and assistance to people, then why is there a statutory ban on amniocentesis? Write the use of this technique and give reason to justify the ban.

List the post-fertilization events in angiosperms.

List the different types of pollination depending upon the source of pollen grain.

Give a scientific term for the following sentences:

1. Total number of individuals of a species in an area.
2. A surgical procedure performed on males in which the vas deferens are cut and tied is known as:
3. A contraceptive device consisting of a small thimble-shaped cup that is placed over the uterus to prevent the entrance of spermatozoa.
4. Removal of gonads, often referring to the removal of male testes is called.

In an association of two animal species, one is a termite which feeds on wood and the other is a protozoan Trichonympha present in the gut of the termite. What type of association they establish?

Describe briefly the following:
Bioreactors

Explain why using tobacco in any form is injurious to health.

Can you think of a situation where we deliberately want to make a species extinct? How would you justify it ?

Certain bacteria are useful to mankind differently. Give examples.

Answer the following questions:

Patients who have undergone myocardial infarction are given clot buster. Mention the clot buster administered and its microbial source.