The thickness of unit membrane is

• 20 A^o

• 35 A^o

• 55 A^o

• 75 A^o

 Largest tiger population is found in

• Sunderban national park

• Corbett national park

• Ranthambhore national park

• Kanha national park

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of

• Lignified thick walls

• Cohesion and adhesion

• Weak gravitational pull

• Transpiration pull

Which insecticide is more hazardous to human health?

• Rotenone

• Pyrethrum

• DDT

• Humulin

Core zone, buffer zone and manipulation zone. are found in

• National park

• Sanctuary

• Tiger reserve

• Biosphere reserve

Polysome is formed by

• Several ribosomes attached to a single mRNA

• Many ribosomes attached to a strand of endoplasmic reticulum

• A ribosome with several sub-units

• Ribosomes attached to each other in a linear arrangement

In gymnosperms, the Ovule is naked because

• Ovary wall is absent

• Integuments are absent

• Perianth is absen

• Nucellus is absent

Gel electrophoresis is used for

• Cutting of DNA into fragments

• Separation of DNA fragments according to their size

• Construction of recombinant DNA by joining with cloning vectors

• Isolation of DNA molecule

Ancestor of man who first stood erect was

• Australopithecus

• Cro-magnon

• Java-ape man

• Peaking man

One of these is not concerned with wildlife conservation

• IVF

• IUCN

• WWF

• IBWL