Fog is an aerosol where liquid droplets are dispersed in a gas (air).
Q43mcq
Which of the following statements is false?
a.
Ca2+ ions are important in blood clotting
b.
Ca2+ ions are not important in maintaining the regular beating of heart
Correct Answer
c.
Mg2+ ions are important in the green parts of plants
d.
Mg2+ ions form a complex with ATP
Step-by-Step AI Explanation
Verified Method
Calcium ions are essential for the regulation of heart rate and rhythm; stating they are not important is false.
Q46mcq
The two polypeptides of human insulin are linked together by
a.
Phosphodiester bond
b.
Covalent bond
c.
Disulphide bridges
Correct Answer
d.
Hydrogen bonds
Step-by-Step AI Explanation
Verified Method
Human insulin consists of two polypeptide chains (A and B) linked together by disulphide bridges.
Q47mcq
The coconut water from tender coconut represents :
a.
Fleshy mesocarp
b.
Free nuclear proembryo
c.
Free nuclear endosperm
Correct Answer
d.
Endocarp
Step-by-Step AI Explanation
Verified Method
Coconut water is a classic example of free-nuclear endosperm, where the primary endosperm nucleus undergoes successive nuclear divisions without cytokinesis.
Q48mcq
Which of the following is not a feature of the plasmids ?
a.
Circular structure
b.
Transferable
c.
Single-stranded
Correct Answer
d.
Independent replication
Step-by-Step AI Explanation
Verified Method
Plasmids are extrachromosomal, double-stranded, circular DNA molecules capable of independent replication.
Q49mcq
Which is the National Aquatic Animal of India ?
a.
River dolphin
Correct Answer
b.
Blue whale
c.
Sea-horse
d.
Gangetic shark
Step-by-Step AI Explanation
Verified Method
The Ganges River dolphin (Platanista gangetica) is the National Aquatic Animal of India.
Q50mcq
The Avena curvature is used for bioassay of
a.
GA3
b.
IAA
Correct Answer
c.
Ethylene
d.
ABA
Step-by-Step AI Explanation
Verified Method
The Avena curvature test is a classic bioassay used specifically to determine the concentration of auxins, such as Indole-3-acetic acid (IAA).
Q51mcq
Which of the following is the most important cause of animals and plants being driven to extinction ?
a.
Alien species invasion
b.
Habitat loss and fragmentation
Correct Answer
c.
Co-extinctions
d.
Over-exploitation
Step-by-Step AI Explanation
Verified Method
Habitat loss and fragmentation are considered the most significant causes driving the current global extinction crisis.
Q52mcq
Which of the following approaches does not give the defined action of contraceptive?
a.
Intra uterine devices Increase phagocytosis of sperms, suppress sperm motility and fertilizing capacity of sperm
b.
Hormonal contraceptives Prevent/retard entry of sperm, prevent ovulation and fertilization
c.
Vasectomy Prevents spermatogenesis
Correct Answer
d.
Barrier methods Prevent fertilization
Step-by-Step AI Explanation
Verified Method
Vasectomy involves surgical blocking of the vas deferens to prevent sperm transport, but it does not inhibit spermatogenesis in the testes.
Q53mcq
In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates -
a.
Chromosomes failed to separate during meiosis
b.
The two genes are linked and present on the same chromosome
Correct Answer
c.
Both of the characters are controlled by more than one gene
d.
The two genes are located on two different chromosomes
Step-by-Step AI Explanation
Verified Method
The production of more parental types than recombinant types in a testcross is the characteristic result of genetic linkage.
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Match the terms in Column-I with their description in Column-II and choose the correct option:
Column-I: (a) Dominance, (b) Codominance, (c) Pleiotropy, (d) Polygenic inheritance
Column-II: (i) Many genes govern a single character, (ii) In a heterozygous organism only one allele expresses itself, (iii) In a heterozygous organism both alleles express themselves fully, (iv) A single gene influences many characters
a.
(1) ii iii iv i
b.
(2) iv i ii iii
c.
(3) iv iii i ii
d.
(4) ii i iv iii
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A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would results in -
a.
Polyploidy
b.
Somaclonal variation
c.
Polyteny
d.
Aneuploidy
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A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?
a.
C4
b.
CAM
c.
Nitrogen fixer
d.
C3
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In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to -
a.
Graft rejection
b.
Auto-immune disease
c.
Active immunity
d.
Allergic response
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In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to:
a.
Graft rejection
b.
Auto-immune disease
c.
Active immunity
d.
Allergic response
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Following are the two statements regarding the origin of life - (a) The earliest organisms that appeared on the earth were non-green and presumably anaerobes (b) The first autotrophic organisms were the chemoautotrophs that never released oxygen. Of the above statements which one of the following options is correct?
a.
(b) is correct but (a) is false
b.
Both (a) and (b) are correct
c.
Both (a) and (b) are false
d.
(a) is correct but (b) is false
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Following are the two statements regarding the origin of life:
(a) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
(b) The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of the following options is correct?
a.
(1) (b) is correct but (a) is false
b.
(2) Both (a) and (b) are correct
c.
(3) Both (a) and (b) are false
d.
(4) (a) is correct but (b) is false
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Mitochondria and chloroplast are-
(a) semi-autonomous organelles
(b) formed by division of pre existing organelles and they contain DNA but lack protein synthesising machinery
Which one of the following options is correct?
a.
(1) (b) is true but (a) is false
b.
(2) (a) is true but (b) is false
c.
(3) Both (a) and (b) are false
d.
(4) Both (a) and (b) are correct
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A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of -
Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options:
a.
Both processes can happen together because the diffusion coefficient of water and CO2 is different.
b.
The above processes happen only during night time.
c.
One process occurs during day time, and the other at night.
d.
Both processes cannot happen simultaneously.
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Which of the following is wrongly matched in the given table?
Microbe Product Application
(1) Monascus purpureus Statins Lowering of blood cholesterol
(2) Streptococcus Streptokinase Removal of clot from blood vessel
(3) Clostridium butylicum Lipase Removal of oil stains
(4) Trichoderma polysporum Cyclosporin A Immunosuppressive drug
a.
1
b.
2
c.
3
d.
4
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Pick out the correct statements :
(a) Haemophilia is a sex-linked recessive disease.
(b) Down's syndrome is due to aneuploidy.
(c) Phenylketonuria is an autosomal recessive gene disorder.
(d) Sickle cell anaemia is an X – linked recessive gene disorder.
a.
(b) and (d) are correct.
b.
(a), (c) and (d) are correct.
c.
(a), (b) and (c) are correct.
d.
(a) and (d) are correct.
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