In gymnosperms, the Ovule is naked because
Ovary wall is absent
Integuments are absent
Perianth is absen
Nucellus is absent
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
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
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
Core zone, buffer zone and manipulation zone. are found in
National park
Sanctuary
Tiger reserve
Biosphere reserve
Which insecticide is more hazardous to human health?
Rotenone
Pyrethrum
DDT
Humulin
C.
DDT
DDT is the most hazardous, non-biodegradable insecticide, which is fat soluble but insoluble in water. It Persists in the environment for a very long period. Being fat soluble, it accumulates in the animal tissue and gets concentrated at different trophic levels of the food chain. At each step, DDT is more concentrated. This is also called biomagnification.
Largest tiger population is found in
Sunderban national park
Corbett national park
Ranthambhore national park
Kanha national park