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441.

The usefulness of cortisome for medicinal purposes led to the identification of _____ a potentially rich source of it:

A.	Discorea	B.	Colocasia
C.	Lantana	D.	Canbis

442.

The various modes in which the leaves are arranged on the stem or the branch, the term is called:

A.	Phyllotaxy	B.	Phyllode
C.	Phylloclade	D.	Cladode

443.

The water potential of pure water is equal to:

A.	Zero	B.	Always negative
C.	Less than zero	D.	More than zero

444.

Theory of 'Acquired characters' was proposed by:

A.	Darwin	B.	Lamark
C.	Bateson	D.	Weismann

445.

Theory of 'Pangenesis' was given by:

A.	Hugo de Vries	B.	Charles Darwin
C.	Lamark	D.	Bateson

446.

Theory of Natural Selection was based on:

A.	Over-production of off springs and consequent struggle for existence	B.	Variation and teir inheritance
C.	Elimination of unfavorable variations	D.	All the above

447.

Theory of overdominance states:

A.	Dominant homozygote is superior to recessive homozygote	B.	Recessive homozygote is superior to dominant homozygote
C.	Hetrozygote is superior to both the homozygote	D.	None of the above

448.

There are four stage of development of Genetics upto 20th century. The correct order of their occurrence is:

A.	Darwinism, Lamarckism, Mendelism, Weismannism	B.	Lamarckism, Darwinism, Weismannism, Mendelism
C.	Lamarckism, Weismannism, Darwinism, Mendelism	D.	Weismannism, Lamarckism, Darwinism, Mendelism

449.

Thick and woody perennial climbers, met within forests, twine round tall trees and at their tops produce a canopy of foliage are:

A.	Twiners	B.	Leaf climbers
C.	Hooke climbers	D.	Lianes

450.

Thomas Andrew Knight first noted differences among wheat varieties in their resistance to:

A.	Smut	B.	Bunt
C.	Rust	D.	Wilt