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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

tubulin

Tubulin is a cytoskeletal globular protein that polymerizes to form microtubules. These radiate from each end of the cell to form a basket like arrangement which helps in the movement of chromosomes to poles. Microtubules also play an important role in the movement of cilia and flagella.

Intermediate filaments are tough rope- like bundles or protein (keratin, desmin, peripherin, vimentin). They provide mechanical stability to cells and interact with microfilaments and microtubules to form cytoskeleton.