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451.

When two organisms live together for mutual help to each other are called:

A.	Saprophytes	B.	Symbionts
C.	Parasites	D.	Epiphytes

452.

When two genes show independent segregation, a genotype AaBb will produce ______ types of gametes:

A.	4	B.	3
C.	2	D.	1

453.

To produce hybrid seed we need:

A.	A male sterile line, restorer, maintainer	B.	A male fertile line and maintainer
C.	A maintainer and restorer	D.	Only male sterile line

454.

When two alleles of a gene are identical, the plant is said to be:

A.	Recessive	B.	Dominant
C.	Heterozygous	D.	Homozygous

455.

Tomato fruit is a:

A.	Drupe	B.	Berry
C.	Siliqua	D.	Hesperidium

456.

Transfer of resistance gene to high yielding self-pollinated varieties is achieved by:

A.	Hybridisation and pedigree selection	B.	Recurrent backcrossing and selection
C.	Hybridisation and bulk selection	D.	Hybridisation and mass selection

457.

Transmission of a gene in Bacterio-phase is known as:

A.	Transversion	B.	Transduction
C.	Inversion	D.	Fusion

458.

Transmission of characteristics and qualities of parents of their offspring is known as:

A.	Mutation	B.	Heredity
C.	Adaptation	D.	Hybridization

459.

Triticale is a cross between:

A.	Wheat & barley	B.	Barley & rye
C.	Wheat & rye	D.	Wheat & oat

460.

tropical Evergreen or Rain Forests occur in areas with annual rainfall:

A.	Exceeding 2,000 mm	B.	1000 - 1,500 mm
C.	500 - 1,000 mm	D.	Scanty