The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and, with Na, is responsible for the transmission of nerve signals.
a.
Potassium
Correct Answer
b.
Iron
c.
Copper
d.
Calcium
Step-by-Step AI Explanation
Verified Method
Potassium ion (K+) activates many enzymes, is involved in cellular respiration/ATP production, and along with Na+ helps in nerve impulse transmission.
Q3mcq
Which of the following is not correct about carbon monoxide?
a.
It is produced due to incomplete combustion.
b.
It forms carboxyhaemoglobin.
c.
It reduces oxygen carrying ability of blood.
d.
The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.
Correct Answer
Step-by-Step AI Explanation
Verified Method
Carboxyhaemoglobin is more stable than oxyhaemoglobin, which is why CO is highly toxic and reduces the oxygen-carrying capacity of blood.
Q46mcq
Flippers of penguins and dolphins are examples of:
a.
Natural selection
b.
Adaptive radiation
c.
Convergent evolution
Correct Answer
d.
Industrial melanism
Step-by-Step AI Explanation
Verified Method
Penguin and dolphin flippers are analogous structures evolved independently for similar function, which is convergent evolution.
Q46mcq
Flippers of penguins and dolphins are examples of:
a.
Natural selection
b.
Adaptive radiation
c.
Convergent evolution
Correct Answer
d.
Industrial melanism
Step-by-Step AI Explanation
Verified Method
Unrelated organisms developing similar adaptations for similar environments is convergent evolution.
Q47mcq
Some dividing cells exit the cell cycle and enter a vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of:
a.
G2 phase
b.
M phase
c.
G1 phase
Correct Answer
d.
S phase
Step-by-Step AI Explanation
Verified Method
Cells usually exit into G0 from the G1 phase when they stop proliferating and enter quiescence.
Q47mcq
Some dividing cells exit the cell cycle and enter a vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of:
a.
G2 phase
b.
M phase
c.
G1 phase
Correct Answer
d.
S phase
Step-by-Step AI Explanation
Verified Method
Cells usually exit the cycle into G0 from the G1 phase.
Q48mcq
Match the following:
(a) Inhibitor of catalytic activity
(b) Possess peptide bonds
(c) Cell wall material in fungi
(d) Secondary metabolite
Choose the correct option from the following:
a.
(ii)(iii)(i)(iv)
b.
(ii)(iv)(iii)(i)
c.
(iii)(i)(iv)(ii)
d.
(iii)(iv)(i)(ii)
Correct Answer
Step-by-Step AI Explanation
Verified Method
Malonate inhibits catalytic activity; collagen has peptide bonds; chitin forms fungal cell wall; ricin is a secondary metabolite.
Q48mcq
Match the following:
(a) Inhibitor of catalytic activity
(b) Possess peptide bonds
(c) Cell wall material in fungi
(d) Secondary metabolite
a.
(i) Ricin, (ii) Malonate, (iii) Chitin, (iv) Collagen
b.
(ii) Malonate, (iv) Collagen, (iii) Chitin, (i) Ricin
Correct Answer
c.
(ii) Malonate, (iv) Collagen, (i) Ricin, (iii) Chitin
d.
(iv) Collagen, (i) Ricin, (iii) Chitin, (ii) Malonate
Step-by-Step AI Explanation
Verified Method
Malonate is an inhibitor of catalytic activity; collagen has peptide bonds; chitin is the fungal cell wall material; ricin is a secondary metabolite.
Q49mcq
Floridean starch has structure similar to:
a.
Laminarin and cellulose
b.
Starch and cellulose
c.
Amylopectin and glycogen
Correct Answer
d.
Mannitol and algin
Step-by-Step AI Explanation
Verified Method
Floridean starch is structurally similar to amylopectin and glycogen because it is branched and α-linked.
Q50mcq
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:
a.
Effect on reproduction
b.
Nutritive value
c.
Growth response
d.
Defence action
Correct Answer
Step-by-Step AI Explanation
Verified Method
These alkaloids act as protective compounds and help in defence against herbivores and pathogens.
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If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10^9 bp, then the length of the DNA is approximately:
a.
2.7 meters
b.
2.0 meters
c.
2.5 meters
d.
2.2 meters
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Which of the following statements are true for the phylum Chordata?
(a) In Urochordata notochord extends from head to tail and is present throughout life.
(b) In Vertebrata notochord is present during the embryonic period only.
(c) Central nervous system is dorsal and hollow.
(d) Chordata is divided into 3 subphyla: Hemichordata, Tunicata and Cephalochordata.
a.
(b) and (c)
b.
(d) and (c)
c.
(c) and (a)
d.
(a) and (b)
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The transverse section of a plant shows the following anatomical features:
(a) Large number of scattered vascular bundles surrounded by bundle sheath.
(b) Large conspicuous parenchymatous ground tissue.
(c) Vascular bundles conjoint and closed.
(d) Phloem parenchyma absent.
Identify the category of plant and its part:
a.
Dicotyledonous root
b.
Monocotyledonous stem
c.
Monocotyledonous root
d.
Dicotyledonous stem
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Match the following columns and select the correct option.
Column I Column II
(a) Bt cotton (i) Gene therapy
(b) Adenosine deaminase deficiency (ii) Cellular defence
(c) RNAi (iii) Detection of HIV infection
(d) PCR (iv) Bacillus thuringiensis
a.
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
b.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
c.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
d.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
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Match the organism with its use in biotechnology.
Column I Column II
(a) Bacillus thuringiensis (i) Cloning vector
(b) Thermus aquaticus (ii) Construction of first rDNA molecule
(c) Agrobacterium tumefaciens (iii) DNA polymerase
(d) Salmonella typhimurium (iv) Cry proteins
a.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
b.
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
c.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
d.
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
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Match the following columns and select the correct option.
Column I Column II
(a) Organ of Corti (i) Connects middle ear and pharynx
(b) Cochlea (ii) Coiled part of the labyrinth
(c) Eustachian tube (iii) Attached to the oval window
(d) Stapes (iv) Located on the basilar membrane
a.
(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
b.
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
c.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
d.
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
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Match the following columns and select the correct option.
Column I Column II
(a) Placenta (i) Androgens
(b) Zona pellucida (ii) Human Chorionic Gonadotropin (hCG)
(c) Bulbo-urethral glands (iii) Layer of the ovum
(d) Leydig cells (iv) Lubrication of the penis
a.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
b.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
c.
(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
d.
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
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Match the following columns and select the correct option.
Column I Column II
(a) Pituitary gland (i) Grave’s disease
(b) Thyroid gland (ii) Diabetes mellitus
(c) Adrenal gland (iii) Diabetes insipidus
(d) Pancreas (iv) Addison’s disease
a.
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
b.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
c.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
d.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
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Match the following with respect to meiosis:
(a) Zygotene
(b) Pachytene
(c) Diplotene
(d) Diakinesis
Select the correct option from the following:
(a) (b) (c) (d)
a.
(ii)(iv)(iii)(i)
b.
(iii)(iv)(i)(ii)
c.
(iv)(iii)(ii)(i)
d.
(i)(ii)(iv)(iii)
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Match the following diseases with the causative organism and select the correct option.
Column I Column II
(a) Typhoid
(b) Pneumonia
(c) Filariasis
(d) Malaria
a.
(iv)(i)(ii)(iii)
b.
(i)(iii)(ii)(iv)
c.
(iii)(iv)(i)(ii)
d.
(ii)(i)(iii)(iv)
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Match the following columns and select the correct option.
Column I Column II
(a) Gregarious, polyphagous
(b) Adult with radial symmetry and larva with bilateral symmetry
(c) Book lungs
(d) Bioluminescence
a.
(ii)(i)(iii)(iv)
b.
(i)(iii)(ii)(iv)
c.
(iv)(i)(ii)(iii)
d.
(iii)(ii)(i)(iv)
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Match the following columns and select the correct option.
Column I Column II
(a) Clostridium butylicum
(b) Trichoderma polysporum
(c) Monascus purpureus
(d) Aspergillus niger
a.
(iv)(iii)(ii)(i)
b.
(iii)(iv)(ii)(i)
c.
(ii)(i)(iv)(iii)
d.
(i)(ii)(iv)(iii)
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Match the following columns and select the correct option.
Column I Column II
(a) Clostridium butylicum (i) Cyclosporin-A
(b) Trichoderma polysporum (ii) Butyric acid
(c) Monascus purpureus (iii) Citric acid
(d) Aspergillus niger (iv) Blood cholesterol lowering agent
a.
(iv)(iii)(ii)(i)
b.
(iii)(iv)(ii)(i)
c.
(ii)(i)(iv)(iii)
d.
(i)(ii)(iv)(iii)
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The plant parts which consist of two generations, one within the other, are:
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
a.
(a) and (d)
b.
(a) only
c.
(a), (b) and (c)
d.
(c) and (d)
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The plant parts which consist of two generations, one within the other, are:
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
a.
(a) and (d)
b.
(a) only
c.
(a), (b) and (c)
d.
(c) and (d)
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Match the following columns and select the correct option.
Column I Column II
(a) 6 - 15 pairs of gill slits (i) Trygon
(b) Heterocercal caudal fin (ii) Cyclostomes
(c) Air bladder (iii) Chondrichthyes
(d) Poison sting (iv) Osteichthyes
a.
(i)(iv)(iii)(ii)
b.
(ii)(iii)(iv)(i)
c.
(iii)(iv)(i)(ii)
d.
(iv)(ii)(iii)(i)
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Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?
(a) Darwin’s finches of Galapagos islands
(b) Herbicide resistant weeds
(c) Drug resistant eukaryotes
(d) Man-created breeds of domesticated animals like dogs
a.
only (d)
b.
only (a)
c.
(a) and (c)
d.
(b), (c) and (d)
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Match the trophic levels with their correct species examples in grassland ecosystem. (a) Fourth trophic level, (b) Second trophic level, (c) First trophic level, (d) Third trophic level. Select the correct option:
a.
(i) Crow (ii) Vulture (iii) Rabbit (iv) Grass
b.
(ii) Vulture (iii) Rabbit (iv) Grass (i) Crow
c.
(iii) Rabbit (ii) Vulture (i) Crow (iv) Grass
d.
(iv) Grass (iii) Rabbit (ii) Vulture (i) Crow
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Match the following columns and select the correct option.
Column I Column II
(a) Eosinophils (i) Immune response
(b) Basophils (ii) Phagocytosis
(c) Neutrophils (iii) Release histaminase, destructive enzymes
(d) Lymphocytes (iv) Release granules containing histamine
a.
(ii)(i)(iii)(iv)
b.
(iii)(iv)(ii)(i)
c.
(iv)(i)(ii)(iii)
d.
(i)(ii)(iv)(iii)
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