Gause’s principle of competitive exclusion states that
a.
More abundant species will exclude the less abundant species through competition.
b.
Competition for the same resources excludes species having different food preferences.
c.
No two species can occupy the same niche indefinitely for the same limited resources.
Correct Answer
d.
Larger organisms exclude smaller ones through competition.
Step-by-Step AI Explanation
Verified Method
Gause’s Competitive Exclusion Principle states that two closely related species competing for the same resources cannot coexist indefinitely and the competitively inferior one will be eliminated.
Q2mcq
The two polypeptides of human insulin are linked together by
a.
Hydrogen bonds
b.
Phosphodiester bond
c.
Covalent bond
d.
Disulphide bridges
Correct Answer
Step-by-Step AI Explanation
Verified Method
The A and B polypeptides of human insulin are linked together by disulphide bonds.
Q3mcq
The coconut water from tender coconut represents
a.
Endocarp
b.
Fleshy mesocarp
c.
Free nuclear proembryo
d.
Free nuclear endosperm
Correct Answer
Step-by-Step AI Explanation
Verified Method
The coconut water in tender coconut is a classic example of free-nuclear endosperm, where the primary endosperm nucleus undergoes successive nuclear divisions without wall formation.
Q3mcq
The coconut water from tender coconut represents
a.
Endocarp
b.
Fleshy mesocarp
c.
Free nuclear proembryo
d.
Free nuclear endosperm
Correct Answer
Step-by-Step AI Explanation
Verified Method
Endosperm development precedes embryo development. The most common type is free-nuclear endosperm where the PEN undergoes successive divisions without immediate cell wall formation. Coconut water is a classic example of free-nuclear endosperm.
Q4mcq
Which of the following statements is wrong for viroids?
a.
They lack a protein coat
b.
They are smaller than viruses
c.
They cause infections
d.
Their RNA is of high molecular weight
Correct Answer
Step-by-Step AI Explanation
Verified Method
The RNA of viroids has low molecular weight as it lacks a protein coat around it; therefore, stating it has high molecular weight is incorrect.
Q5mcq
Which of the following features is not present in the Phylum - Arthropoda?
a.
Chitinous exoskeleton
b.
Metameric segmentation
c.
Parapodia
Correct Answer
d.
Jointed appendages
Step-by-Step AI Explanation
Verified Method
Parapodia are lateral appendages found in aquatic annelids which help in swimming, not in arthropods.
Q6mcq
Which of the following most appropriately describes haemophilia?
a.
Recessive gene disorder
b.
X-linked recessive gene disorder
Correct Answer
c.
Chromosomal disorder
d.
Dominant gene disorder
Step-by-Step AI Explanation
Verified Method
Haemophilia is a classic sex-linked recessive disease where the defective gene is present on the X chromosome.
Q7mcq
Emerson's enhancement effect and Red drop has been instrumental in the discovery of
a.
Photophosphorylation and non-cyclic electron transport
b.
Two photosystems operating simultaneously
Correct Answer
c.
Photophosphorylation and cyclic electron transport
d.
Oxidative phosphorylation
Step-by-Step AI Explanation
Verified Method
Emerson's enhancement effect (increased photosynthesis rate with two wavelengths) and red drop (low efficiency at >680nm) proved the existence of two distinct photosystems (PS I and PS II) operating in plants.
Q9mcq
Name the chronic respiratory disorder caused mainly by cigarette smoking
a.
Emphysema
Correct Answer
b.
Asthma
c.
Respiratory acidosis
d.
Respiratory alkalosis
Step-by-Step AI Explanation
Verified Method
Emphysema is a chronic disorder in which alveolar walls are damaged due to cigarette smoking, leading to a reduction in the respiratory surface area.
Q9mcq
Name the chronic respiratory disorder caused mainly by cigarette smoking.
a.
Emphysema
Correct Answer
b.
Asthma
c.
Respiratory acidosis
d.
Respiratory alkalosis
Step-by-Step AI Explanation
Verified Method
Emphysema is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. Cigarette smoking is a major cause.
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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 synthesizing machinery. Which one of the following options is correct?
a.
Both (a) and (b) are correct
b.
(b) is true but (a) is false
c.
(a) is true but (b) is false
d.
Both (a) and (b) are false
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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:
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.
Allergic response
b.
Graft rejection
c.
Auto-immune disease
d.
Active immunity
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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) (ii) (i) (iii)
b.
(2) (ii) (ii) (iv) (iii)
c.
(3) (iv) (iii) (ii) (iv)
d.
(4) (iv) (iii) (i) (ii)
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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 a X-linked recessive gene disorder
a.
(a) and (d) are correct
b.
(b) and (d) are correct
c.
(a), (c) and (d) are correct
d.
(a), (b) and (c) are correct
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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 a X-linked recessive gene disorder
a.
(1) (a) and (d) are correct
b.
(2) (b) and (d) are correct
c.
(3) (a), (c) and (d) are correct
d.
(4) (a), (b) and (c) are correct
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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 utilisation. In which of the following physiological groups would you assign this plant?
a.
C3
b.
C4
c.
CAM
d.
Nitrogen fixer
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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.
(a) is correct but (b) is false.
b.
(b) is correct but (a) is false.
c.
Both (a) and (b) are correct.
d.
Both (a) and (b) are false.
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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 the following options.
a.
Both processes cannot happen simultaneously.
b.
Both processes can happen together because the diffusion coefficient of water and CO2 is different.
c.
The above processes happen only during night-time.
d.
One process occurs during daytime, and the other at night.
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A cell at the 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 the telophase stage. There is no formation of cell plates and thus the cell contains a greater number of chromosomes as compared to other dividing cells. This would result in
a.
Aneuploidy
b.
Polyploidy
c.
Somaclonal variation
d.
Polyteny
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