Reproducing new plants by cells, instead of seeds, is known as :
Mutation
antibiotics
biofertilizer
tissue culture
D.
tissue culture
Tissue Culture is the term generally used for artificial growth. The plant tissue culture refers to the growth of plant cells, tissues and organs on artificial nutrient media. Haberlandt, a German botanist gave the term Plant Tissue Culture.
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 insecticide is obtained from the roots of Derris elliptica ?
Cinerin
Nicotine
Rotenone
Pyrethrum
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
The phase of menstrual cycle in humans that lasts for 7-8 days, is :
menstruation
luteal phase
ovulatory phase
follicular phase