ZOOLOGY (2020 March)
ANSWERS
1.
(c) ¨
2.
(b) ZIFT
3.
(d) Methanobacterium
4.
(b) Dryopithecus
5.
(c) Alien species invasions
6.
|
Microbes in Household Products |
Microbes as Bio-fertilizers |
|
Propionibacterium
sharmanii Lactic acid bacteria Saccharomyces cerevisiae Aspergillus niger |
Rhizobium Azospirillum Azotobacter Anabaena |
7.
(a) Monohybrid cross
(b) Law of Dominance, Law
of Segregation.
8.
No. Fertilization happens only if ovum & sperms are
transported simultaneously. So all copulations do not lead to fertilization
& pregnancy.
9.
A= Charles Darwin
B= Lamarck
C= de Vries
D= Aristotle / Louis
Pasteur.
10.
(a) Genetic code is degenerate.
Genetic code is
unambiguous.
(b) Initiator codon:
AUG
Name of amino acid it
codes:
Methionine.
11.
(a) Amniocentesis is a test in which amniotic fluid of the
foetus is taken to analyse the foetal cells to test the presence of genetic
disorders, survivability of the foetus etc.
(b) It is misused for
finding out the sex of the embryo.
12.
Protozoan disease 1: Malaria
Causative organism: Plasmodium sp.
Symptoms: Chill and high fever.
Protozoan disease 2: Amoebiasis.
Causative organism: Entamoeba histolytica.
Symptoms: Constipation, abdominal
pain.
13.
Yes. I agree.
Tropical Amazonian
rainforest has the greatest species richness. It contains > 40000 plant
species, > 5000 vertebrates and > 1,25,000 species of invertebrates. This
is because tropical regions have constant environment and gets more solar
energy.
14.
(a) Opioids
(b) Stimulates CNS.
(c) Papaver sominferum
(Poppy plant)
(d) Cannabis sativa
(Hemp plant)
15.
(a) Haemophilia is a sex linked recessive disease.
Or
Sickle cell anaemia is an
autosome linked recessive disease.
(b) Turner's syndrome is
due to the absence of an X chromosome
Or
Klinefelter’s
syndrome is due to the presence of an additional copy of an X chromosome.
16.
(a) Hardy – Weinberg Principle.
(b) Gene migration, Genetic
drift, Mutation etc.
17.
(a) DNA replication.
(b) DNA polymerase, DNA
ligase, Helicase etc.
(c) One strand is formed as
continuous strand (leading strand). Other strand is formed as small stretches
(Okazaki fragments).
18.
Avoid undue peer pressure.
Education and counselling.
Seeking help from parents
and peers.
Looking for danger signs.
Seeking professional and
medical help.
19.
(a) A= Progesterone, B= Estrogen.
(b)
(c) Hormone: Progesterone.
Function: Maintains
endometrium/ pregnancy.
20.
(a) 3' – TACGTACGTACGTACGTACGTACGTA – 5’
(b) DNA dependent RNA
polymerase.
(c) It results in the
production of 2 RNA molecules simultaneously. This would be complimentary to
each other. It forms a double stranded RNA and prevents translation.