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Leaves become modified into spines in :
(1)Silk Cotton
(2)Opuntia
(3)Pea
(4)Onion
1.(2)

2.Vertical distribution of different species occupying different levels in a biotic community is known as :
(1)Pyramid
(2)Divergence
(3)Stratification
(4)Zonation
2.(3)
3.Transpiration and root pressure cause water to rise in plants by :
(1)pushing and pulling it, respectively
(2)pulling it upward
(3)pulling and pushing it, respectively
(4)pushing it upward
3.(3)
4.Gene regulation governing lactose operon of E.colithat involves the lac I gene product is :
(1)Feedback inhibition because excess of galactosidase can switch off transcription
(2)Positive and inducible because it can be induced by lactose
(3)negative and inducible because repressor protein prevents transcription
(4)negative and repressible because repressor protein prevents transcription
4.(2)
5.High value of BOD (Biochemical Oxygen Demand) indicates that :
(1)consumption of organic matter in the water is higher by the microbes
(2)water is pure
(3)water is highly polluted
(4)water is less polluted
5.(3)
6.Which one of the following matches is correct
(1)Agaricus
Parasitic fungus
Basidiomycetes
(2)
Phytophthora
Aseptate mycelium
Basidiomycetes
(3)
Alternaria
Sexual reproduction absent
Deuteromycetes
(4)
Mucor
Reproduction by Conjugation
Ascom
ycetes
6.(3)
7.Which of these is not an important component of initiation of parturition in humans?
(1)Release of prolactin
(2)Increase in estrogen and progesterone ratio
(3)Synthesis of prostaglandins
(4)Release of oxytocin
7.(1)
8.A chemical signal that has both endocrine and neural roles is :
(1)Cortisol
(2)Melatonin
(3)Calcitonin
(4)Epinephrine
8.(4)


AIPMT Question paper with solutions







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