- Study the flow chart given below. Name the hormones
involved at each stage and explain their functions. - In a large population, only a person in 10,000 is albino.
What will be the frequency of carriers of albinism in the
population?
OR
(i) Why is fertilization in an angiosperm referred to as double
fertilization?
(ii) Draw a neat labelled sketch of L.S. of an endospermous
monocot seed.
14.(i) Why is DNA molecule a more stable genetic material
than RNA?
(ii) “Unambiguous”, “degenerate” and “universal” are some
of the salient features of genetic code. Explain what they
mean?
- How does industrial melanism explain the Darwin’s theory
of natural selection? - (i) Anthropogenic actions have caused evolution of
species. Explain with the help of two examples.
(ii) Differentiate between divergent and convergent
evolution.
- (i) Name the infective stage of Plasmodium which
Anopheles mosquito takes in along with the blood meal
from an infected human.
(ii) Why does the infection cause fever in human?
(iii) Give a flow chart of the part of life cycle of this parasite
passed in the insect.
- Explain the types of fish breeding.
- (i) How is mature insulin different from proinsulin
secreted by pancreas in humans?
(ii) Explain how is human functional insulin produced using
rDNA technology.
(iii) Why is the functional insulin thus produced, considered
better than the ones used earlier by diabetic patients?
20.(i) Explain giving reasons why the tourists visiting
Rohtang Pass or Mansarovar are advised to resume
normal ‘active life’ only after a few days of reaching
there?
(ii) It is impossible to find small animals in the polar regions.
Give reasons.- (i) Differentiate between in situ conservation and ex situ
conservation?
(ii) Mention some measures for control of solid wastes. - On seeing the bad state of roads in your locality, you
have recommended to the Municipal Corporation to use
polyblend.
(i) What is polyblend? Point out its raw material.
(ii) How will it be advantageous?
SECTION - D - Manya was waiting at a bus stop. Many passengers along
with their kids were on their way to school. A bus came
and covered the children with black smoke ejected from
the exhaust pipe. Manya immediately stopped the bus
and called the conductor and driver to show what they
had done. Passengers waiting at the bus stop supported
Tanvi while those on board became restless for being
delayed.
(i) Why were the children more affected? How would you
justify Manya’s act?
(ii) Many vehicles are seen with Bharat stage IV stickers.
What does it imply?
(iii) How do catalytic converters reduce vehicular gas
emission?
SECTION - E - Two blood samples A and B picked up from the crime
scene were handed over to the forensic department for
genetic fingerprinting. Describe the technique of genetic
fingerprinting. How will it be confirmed whether the
samples belonged to the same individual or two different
individuals? OR
Describe the events of spermatogenesis with the help of
a schematic representation.
25.(i) What is plant breeding?
(ii) How has the mutation breeding helped in improving
crop varieties? Give one example where this technique
has helped.
(iii) How has the breeding programme helped in improving
the public nutritional health? State two examples in
support of your answer.
OR
(i) Differentiate between farmyard manure, biofertilisers and
green manures.
(ii) How is green manure prepared?