Subject

Biology

Class

NEET Class 12

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NEET Biology Solved Question Paper 2010

Multiple Choice Questions

71.

Cotton fibre is basically a type of

trichome
scale
dried seed coat
non glandular hair

72.

The term 'alpha diversity' refers to

genetic diversity
community and ecosystem diversity
species diversity
diversity among the plants

73.

Percentage composition of fibroin and sericin in silk is

50 : 40
80 : 20
30 : 70
40 : 60

74.

Which one of the following is biological insecticide?

Tiger beetle
Caterpillar
Silkmoth
Mazra poka

75.

Which one of the following diseases is spread by housefly?

Dengue fever
Encephalitis
Filariasis
Typhoid

76.
Nutrient enrichment of a lake will cause

eutrophication

stratification

biomagnification

bioaccumulation

eutrophication

Eutrophication is an increase in the concentration of chemical nutrients in an ecosystem to an extent that increases the primary productivity of the ecosystem.

Stratification is a system or formation of layers, classes or categories. In ecology, it refers to the vertical layering of a habitat or the vertical arrangement of vegetation in layers.

Biomagnification is the increasing concentration of a substance, such as toxic chemical, in the tissues of tolerant organisms at successively higher levels in a food chain.

Bioaccumulation is the accumulation of substances such as pesticides or other chemicals is an organism.