Which one of the following is a characteristic feature of cropland ecosystem?

Which of the following is the most important cause of animals and plants being driven to extinction?

In a chloroplast the highest number of protons is found in:

Which of the following is not required for any of the techniques of DNA fingerprinting available at present?

The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the:

Which of the following features is not present in Penplaneta americana?

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called:

Which of the following is wrongly matched in the given table?
Microbe - Product - Application

In mammals, which blood vessel would normally carry the largest amount of urea?

Pick out the correct statements:
(a) Haemophilia is a sex-linked recessive disease
(b) Down’s syndrome is due to aneuploidy.
(c) Phenylketonuria is an autosomal recessive gene disorder.
(d) Sickle cell anaemia is an X – linked recessive gene disorder.