Questions On Genetics,
Micro-Organism, Man and His Health
1.
Which
of these chromosome is for female ?
A XML
B XX
C HTML
D YY
Answer: B
2.
The
theory of use and disuse of organs was propounded by
A Gregor Mendel
B Charles Darwin
C Jean Lamarck
D Robert Hooke
Answer: C
3.
Which
of the following is an example of discontinuous variation observed in man?
A Skin colour
B Tongue rolling
C Finger prints
D Height
Answer: B
4.
The
hereditary material in a cell is also known as
A ADP
B ATP
C DNA
D RNA
Answer: C
5.
The
characters by which an organism is recognised are termed its
A phenotype
B genotype
C morphology
D physiology
Answer: A
6.
If
a child can receive blood from all donors, he belongs to the blood group
A O
B A
C B
D AB
Answer:
D
7. The character producing factors in
living organisms are
A chromosomes
B alleles
C genes
D chromomeres
Answer: C
8. An organism having one pair of
identical genes is----
A an allelomorph
B hybrid
C a homozygote
D a heterozygote
Answer: C
9. Which of the following is not a type
of fingerprint?
A Whorl
B Simple
C Loop
D Compound
Answer: D
10.
The
haploid number of chromosomes in man is---------?
A 48
B 46
C 23
D 24
Answer: C
11 When a person with blood group O has
much blood due to an accident, he can be given blood from persons who have
blood belonging to
A group O only
B group A only
C
group AB only
D groups A and O only
Answer: A
12
Normally
any character shown by an organism is due to the effect of
A hormones and chromosomes
B chromosomes
C mutation
D hormones and genes
Answer: D
13 If
you crossbreed a tall variety (Tt) of maize with a short variety (tt), the
ratio of tall to short plants in the offspring will be
A 2:1
B 1:2
C 1:1
D 1:3
Answer:
C
14 A
person whose blood can be donated to all other people, must have the blood
group
A O
B AB
C B
D A
Answer:
A
15 Which of the following is not a constituent
of DNA?
A Purine
B Phosphate
C Cytosine
D Uracil
Answer:
D
16 The diploid number of chromosomes in man is
---------?
A 48
B 46
C 23
D 24
Answer:
B
17 Which of the following is the precise
location of the gene?
A Chromosome
B Ribosome
C Centrosome
D Centriole
Answer:
A
18 Which
of the following major ideas were proved by Gregor Mendel?
A There is a tendency among organisms
to increase rapidly in
number if conditions are favourable.
B All species exhibit structural and
functional variations
C Characteristics of an organism are
controlled by genes occurring in pairs.
D Nature selects organisms which
will survive to produce their kind
Answer:
C
Micro-Organism:
Man and His Health
19 The
process whereby microorganisms can convert atmospheric nitrogen into nitrogen
compound is known as
A denitrification
B nitrogen fixation
C nitrogen cycle
D decomposition
Answer: B
20 Which
of the following are not causative organisms of plant
diseases?
A Fungi
B Bacteria
C Virus
D Cercariae
Answer: D
21 Which
of the following substances can not control the growth of harmful
microorganisms?
A Antibiotics
B Antiseptics
C Disinfectants
D Isotonic sugar solution
Answer:D
22 Microorganisms
which break down dead organisms and absorb their content ate called
A decomposers
B consumers
C parasites
D commensals
Answer: A
23 The
substances recycled in the soil by the activities of microorganisms during the
decay of dead organisms are first utilized by the-------
A herbivores
B carnivores
C decomposers
D scavengers
Answer:
D
24 The following are useful effects of
microorganisms except
A production of vaccines
B curing of tobacco
C decay of meat
D tanning of leather
Answer:
C
25 Microorganisms are important in recycling nutrient
because
A they are capable of multiplying
quickly
B they are eaten by large organisms
C many are parasites
D they break down dead organic materials
Answer:
D
26 One
of the ecological conditions which favour the spread of malaria is
A presence of stagnant water
B improper disposal of sewage into
the sea
C improper disposal of decaying
organic matter
D presence of water weed
Answer:
A
27 Which sexual chromosome belongs to men
A xy
B xxx
C xx
D y
Answer:
A
28 Which
of the following characters is not a morphological variation?
A shape of the nose
B colour of the skin
C colour of hairs
D tongue rolling
Answer:
D
29 An
apple plant can produce asexually and sexually and it has 40 chromosomes in its
leaf cells. How many chromosomes world will be in each gametes and somatic
cell?
A 20 chromosomes in the gametes and
10 in the somatic cells
B 40 chromosomes in the gametes and
20 in the somatic cells
C 20 chromosomes in the gametes and
40 in the somatic cells
D 40 chromosomes in the gametes and
40 in the somatic cells
Answer:
C
30 Assuming
that A is the gene for normal skin colour and is dominant, while a is the gene
for albinism and it's recessive, what is the
likely genotype of the couple
which had 50% normal and 50% albino offspring?
A Aa, aa
B AA, as
C AA, Aa
D Aa, Aa
Answer
: C
31 Which of the following statements is true
about mutation?
A Phenotype is not involved
B Genotype not involved
C Artificial induction is not
possible
D Genotype is involved
Answer:
D
32 Which sexual chromosome belongs to women
A xy
B xxx
C xx
D y
Answer:
C
ANSWERS FOR QUESTION 1-----32
1B 2C 3B 4C 5A 6D 7C 8C 9D 10C 11A 12D 13C 14A 15D 16B 17A
18C 19B 20D 21D 22A 23D 24C 25D 26A 27A 28D 29C 30C 31D 32C
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