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61.

At the molecular level point mutations are due to:

A.	Destruction of the bases	B.	Destruction of the double helix
C.	Shifting of a portion of the helix and bases	D.	Alterations of sequences of base in DNA

62.

At the stage incipient plasmolysis the turgor pressure is:

A.	Zero	B.	2 atm.
C.	4 atm	D.	22.4 atm.

63.

At the stage of fully turgid cell, the suction pressure will be:

A.	Equal to wall pressure	B.	Zero
C.	Equal to osmotic pressure	D.	Maximum

64.

ATP synthesis occurs in:

A.	Chloroplast	B.	Chloroplast and mitochondria
C.	Chloroplast, mitochomdria and muclei	D.	Mitochondria

65.

Bacteria, protozoa and other living plants and animals are:

A.	Climatic factors	B.	Edaphic factors
C.	Biotic factors	D.	Topographic factors

66.

Baldness in human being is a:

A.	Sex linked character	B.	Sex limited character
C.	Sex-influenced character	D.	None of the above

67.

Barely is a ______ pollinated crop:

A.	Often-cross	B.	Self and cross
C.	Cross	D.	Self

68.

Biffin in 1905 announced, that resistance to yellow rust of wheat is governed by ______ gene in crosses:

A.	Single dominant	B.	Single recessive
C.	Double dominant	D.	Double recessive

69.

Binomial system of Nomenclature means that the name of plant is made up of two words, which designate:

A.	Family and genus	B.	Order and family
C.	Species and family	D.	Genus and species

70.

Bread wheat is:

A.	Haploid	B.	Diploid
C.	Tetraploid	D.	Auto-allopolyploid