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NEET Biology Solved Question Paper 2009

Multiple Choice Questions

31.

Agar- agar is obtained from

Chlorella
Spirogyra
Ulothrix
Gelidium

32.

Duramen is present in

inner region of secondary wood
part of sap wood
outer region of secondary wood
region of pericycle

33.

In plants, water supply is due to

osmosis
imbibition
guttation
adhesion force

34.

Most of the economically important fibre yielding plants belong to family

Malvaceae
Solanaceae
Cruciferae
Paceae

35.

Paraffin wax is

ester
acid
monohydric alcohol
cholesterol

36.

In cell cycle, during which phase chromosomes are arranged in equatorial plate?

Metaphase
Anaphase
Telophase
Prophase

37.

Spindle fibre is made up of

tubulin
humulin
intermediate filament
flagelin

38.
Induction of flowering by low temperature treatment is

vernalization

cryobiology

photoperiodism

prunning

vernalization

Vernalization is chilling or cold treatment of the young plants in order to induce flowering. It is a process for shortening the juvenile or vegetative phase of the plants in order to fasten the flowering process. Common examples includes winter rye, winter wheat, winter barley, pea etc.

Cryobiology is the study of life at low temperature, ie, at liquid nitrogen and preservation of organisms by chemical methods.

Photoperiodism is the effect of photoperiods or daily duration of light hours on the growth and development of flowering in plants.