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WorksheetsXII BIO HALF YEARLY 2020-21
Total questions: 20
Worksheet time: 20mins
1)When the pollen of a flower is transferred to the stigma of another flower on the same plant, the process is known as
a)autogamy
b)geitonogamy
c)xenogamy
d)cleistogamy
2)the number of meiotic divisions,required to produce 400 seeds in a pea plant , is
a)100
b)200
c)400
d)500
3)The exine of pollen grains is made up of-------------
(a)
4)select the correct sequence of stages of spermatogenesis in a human male
a)spermatogonium-----spermatids----spermatocytes----spermatozoa
b)spermatogonium------spermatocytes-----spermatids----spertmatozoa
c)spermatids----spermatogonium----spermatocytes-----spermatozoa
Spermatocytes----spermatogonium----spermatids-----spermatozoa
5)The secondary oocyte completes its meiosis II when a sperm comes in contact with it and forms a large cell, the --------and a second polar body
(a)
A-4, B-3, C-1, D-2
A-3 , B-4, C-1,D-2
A-2, B-3, C-1,D-4
A-1,B-4, C-3,D-2
7)which of the following is hormone releasing
a) multiload 375
b) LNG-20
c) Lippesloop
d) Cu 7
8)in which of the following ART's does invivo fertilisation occur
a) ZlFT
b) GIFT
c) ICSI
d) IVF
A-3, B-2, C-4, D-1
A-4, B-2, C-3, D-1
A-1, B-4, C-3, D-2
A-3,:B-1, C-4, D-2
10)when ' Aa' is crossed with' aa' (A is dominant over a)
a)all the offspring Will have dominant phenotype
b) all the offspring will have recessive phenotype
c) 50% of offspring will have dominant phenotype and recessive phenotype
d) 75% of offspring will have dominant phenotype and recessive phenotype
11) The possibility of all genotypes of offspring in a genetic cross is calculated by a graphical representation which was developed by
a) komberg
b)T.H Morgan
c) gregor mendel
d)reginald punnet
12)occasionally, a single gene may express more than one effect.the phenomenon is called
a)multiple allelism
b)mosaicism
c)Pleiotropy
d)Polygeny
13)Eukaryotic RNA polymerase III catalyses the synthesis of
a) mRNA
b) r RNA
c) hnRNA
d)t RNA
14) In the lac operon of e.coli, the i gene codes for
a)inducer
b) repressor
c) lactase
B-galactosidase
15) which of the following are the functions of RNA?
a) It is a carrier of genetic information from DNA to ribosomes sunyhesising polypeptides
b)It carries aminoacids to ribosomes
c)It is a constituent components of ribosomes
d) ALL the above
A-2, B-1, C--2, D-4
A-4, B-1, C-2, D-3
A-1,B-2, C-3, D-4
A-4, B-3, C-2, D-1
17) Lactic acid is formed by the process of
a)fermentation
b)glycolysis
c)citric acid cycle
d)B-Oxidation
18)The primary treatment of wastewater involves the ramovalof
a)dissolved impurities
b)stable particles
c) toxic substances
d)harmful bacteria
19) The residue left after methane production from cattledung is
a)burnt
b) burned in landfills
c)used as manure
d) used in civil construction
A-1, B-4, C-5, D-3
A-3, B-4,C-5, D-1
A-1, B-2, C-3, D-4
A-5, B-2, C-5,D-4
