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
Reproducing new plants by cells, instead of seeds, is known as :
Mutation
antibiotics
biofertilizer
tissue culture
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
C.
Rotenone
Rotenone is a valuable natural insecticide, which is also used as fish and arrow poisons. It is extracted from roots of many members of family Leguminosae. e.g., Derris elliptica, Millettis, Taphrosia.