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431.

The theory of catastrophism was introduced by:

A.	Christian Church	B.	Cuvier
C.	Lmark	D.	Darwin

432.

The theory of genes in the chromosomes was introduced by:

A.	Mendel	B.	Morgan
C.	Strasburger	D.	Hugo de Vries

433.

The theory of 'Natural Selection' was put forward in:

A.	1850	B.	1859
C.	1869	D.	1865

434.

The topographic factors include:

A.	Undulation	B.	Altitude
C.	Slope	D.	All the above

435.

The total volume of water on melting:

A.	Increases	B.	Remains constant
C.	Decreases	D.	None of these

436.

The transference of pollengrain from the anther of a flower to the stigma of the same flower is known as:

A.	Self-polliniltion	B.	Cross polination
C.	Fertilization	D.	Mating

437.

The transference of pollengrains from the anther to the stigma is called:

A.	Fertilization	B.	Double fertilization
C.	Mating	D.	Pollination

438.

The turgor pressure is always equal and opposite in direction to:

A.	Diffusion pressure	B.	Wall pressure
C.	Osmotic pressure	D.	DPD

439.

The two integuments of a ovule develop into:

A.	Seed coats	B.	Disintegrate
C.	Plumule	D.	Pericarp

440.

The type of male sterility used in hybrid seed production in pearlmilet is:

A.	Genetic male sterility	B.	Cytoplasmic male sterility
C.	Genetic cytoplasmic male sterility	D.	None of the above