Reproducing new plants by cells, instead of seeds, is known as :

• Mutation

• antibiotics

• biofertilizer

• tissue culture

The phase of menstrual cycle in humans that lasts for 7-8 days, is :

• menstruation

• luteal phase

• ovulatory phase

• follicular phase

Which one of the following statement with regard to the embryonic development in humans is correct ?

• Cleavage results in a hollow balls of cells called morula

• Cleavage in mammalian ova is unequal holoblastic and horizontal

• Rearrangement of blastomeres, a central cavity is formed inside the morula

• Cleavage bring about considerable increase in the mass of protoplasm

Which of the following is not immunised by triple antigen ?

• Typhoid

• Tetanus

• Diptheria

• Whooping cough

A person with the sex chromosomes XXY suffers from :

• Down's syndrome

• Turner's syndrome

• Gynandromorphism

• Klinefelter's syndrome

Which of the following represents Klinefelter's syndrome?

• XX

• XO

• XY

• XXY

Which is the closest pet of human being ?

• Cat

• Cow

• Dog

• Buffalo

The bacterial disease which is found in chickens is :

• rickets

• Ranikhets

• fowl fox

• fowl cholera

Creosote is used to prevent:

• rusts of wheat

• dry rot of wood

• loose smut of oats

• brown rust of barley

Which of the following insecticide is obtained from the roots of Derris elliptica ?

• Cinerin

• Nicotine

• Rotenone

• Pyrethrum