Name the enzyme that facilitates opening of DNA helix during transcription.
a.
DNA polymerase
b.
RNA polymerase
Correct Answer
c.
DNA ligase
d.
DNA helicase
Step-by-Step AI Explanation
Verified Method
RNA polymerase itself facilitates the opening of the DNA helix during transcription. It unwinds the DNA double helix at the transcription bubble as it moves along the template strand, unlike DNA replication where a separate helicase enzyme is required.
Q2mcq
Which of the following would help in prevention of diuresis?
a.
Atrial natriuretic factor causes vasoconstriction
b.
Decrease in secretion of renin by JG cells
c.
More water reabsorption due to undersecretion of ADH
d.
Reabsorption of Na+ and water from renal tubules due to aldosterone
Correct Answer
Step-by-Step AI Explanation
Verified Method
Aldosterone promotes reabsorption of Na+ from the renal tubules, and water follows osmotically, thereby increasing water retention and preventing diuresis (excess urine production). ADH undersecretion would actually increase diuresis, not prevent it. Decreased renin would reduce angiotensin II and aldosterone, promoting diuresis. ANF causes vasodilation (not vasoconstriction) and promotes diuresis.
Q3mcq
Meiotic division of the secondary oocyte is completed
a.
After zygote formation
b.
At the time of fusion of a sperm with an ovum
Correct Answer
c.
Prior to ovulation
d.
At the time of copulation
Step-by-Step AI Explanation
Verified Method
The secondary oocyte is arrested at metaphase II of meiosis. Meiosis II is completed only when a sperm penetrates the secondary oocyte (fertilization), resulting in the formation of a mature ovum and a second polar body. The completion of meiosis II is thus triggered by sperm entry.
Q4mcq
Match the following concerning essential elements and their functions in plants:
(a) Iron — (i) Photolysis of water
(b) Zinc — (ii) Pollen germination
(c) Boron — (iii) Required for chlorophyll biosynthesis
(d) Manganese — (iv) IAA biosynthesis
Select the correct option.
Iron is required for chlorophyll biosynthesis (iii); Zinc is required for IAA (auxin) biosynthesis (iv); Boron is essential for pollen germination and pollen tube growth (ii); Manganese is involved in photolysis of water during the light reactions of photosynthesis (i).
Q5mcq
Which of the following pairs is of unicellular algae?
a.
Anabaena and Volvox
b.
Chlorella and Spirulina
Correct Answer
c.
Laminaria and Sargassum
d.
Gelidium and Gracilaria
Step-by-Step AI Explanation
Verified Method
Chlorella is a unicellular green alga, and Spirulina is a unicellular (filamentous but often treated as unicellular in NCERT context) cyanobacterium. Anabaena is filamentous, Volvox is colonial, Laminaria and Sargassum are multicellular brown algae, and Gelidium and Gracilaria are multicellular red algae.
Q6mcq
The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of
a.
1 molecule of 6-C compound
b.
1 molecule of 4-C compound and 1 molecule of 2-C compound
c.
2 molecules of 3-C compound
d.
1 molecule of 3-C compound
Correct Answer
Step-by-Step AI Explanation
Verified Method
During photorespiration, RuBisCo acts as an oxygenase and combines RuBP (5-C) with O2. This reaction yields one molecule of 3-phosphoglycerate (3-C compound) and one molecule of phosphoglycolate (2-C compound). The question asks specifically about the product of the oxygenation — the 3-C compound (3-phosphoglycerate) is the direct product referenced. However, as per the printed answer (4), the answer is 1 molecule of 3-C compound (3-phosphoglycerate).
Q7mcq
Match the following columns and select the correct option.
Column-I: (a) Eosinophils, (b) Basophils, (c) Neutrophils, (d) Lymphocytes
Column-II: (i) Immune response, (ii) Phagocytosis, (iii) Release histaminase, destructive enzymes, (iv) Release granules containing histamine
Eosinophils release histaminase and destructive enzymes (iii); Basophils release granules containing histamine (iv); Neutrophils are phagocytic cells (ii); Lymphocytes are responsible for immune response (i). This matches option (3): (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i).
Q8mcq
Match the following columns and select the correct option.
Column-I: (a) Placenta, (b) Zona pellucida, (c) Bulbo-urethral glands, (d) Leydig cells
Column-II: (i) Androgens, (ii) Human Chorionic Gonadotropin (hCG), (iii) Layer of the ovum, (iv) Lubrication of the penis
Placenta secretes hCG (ii); Zona pellucida is the layer surrounding the ovum (iii); Bulbo-urethral glands provide lubrication of the penis (iv); Leydig cells (interstitial cells) in the testes secrete androgens (i). This matches option (2): (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i).
Q8mcq
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
Placenta secretes hCG; Zona pellucida is the glycoprotein layer surrounding the ovum; Bulbo-urethral glands produce secretions for lubrication of the penis; Leydig cells (interstitial cells) in the testes secrete androgens.
Q9mcq
The plant parts which consist of two generations - one within the other:
(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.
(c) and (d)
b.
(a) and (d)
Correct Answer
c.
(a) only
d.
(a), (b) and (c)
Step-by-Step AI Explanation
Verified Method
Pollen grains (gametophyte generation) inside the anther (sporophyte generation) represent two generations one within the other. Similarly, the embryo sac (female gametophyte) inside the ovule (part of sporophyte) also represents two generations. A seed inside a fruit and a germinated pollen grain with male gametes do not represent two distinct generations one within the other in the same sense.
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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.
(c) and (d)
b.
(a) and (d)
c.
(a) only
d.
(a), (b) and (c)
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Match the organism with its use in biotechnology.
(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
Select the correct option from the following:
a.
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
b.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
c.
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
d.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
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Match the organism with its use in biotechnology.
(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
Select the correct option from the following:
a.
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
b.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
c.
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
d.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
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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 stem
b.
Dicotyledonous root
c.
Monocotyledonous stem
d.
Monocotyledonous root
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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.
(b), (c) and (d)
b.
only (d)
c.
only (a)
d.
(a) and (c)
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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 it is present throughout their 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.
(a) and (b)
b.
(b) and (c)
c.
(d) and (c)
d.
(c) and (a)
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Match the following diseases with the causative organism and select the correct option.
Column-I: (a) Typhoid, (b) Pneumonia, (c) Filariasis, (d) Malaria
Column-II: (i) Wuchereria, (ii) Plasmodium, (iii) Salmonella, (iv) Haemophilus
a.
(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
b.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
c.
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
d.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
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Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external inter-costal muscles
(c) Pulmonary volume decreases
(d) Intra pulmonary pressure increases
a.
(a), (b) and (d)
b.
only (d)
c.
(a) and (b)
d.
(c) and (d)
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Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external inter-costal muscles
(c) Pulmonary volume decreases
(d) Intra pulmonary pressure increases
a.
(a), (b) and (d)
b.
Only (d)
c.
(a) and (b)
d.
(c) and (d)
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Match the following columns and select the correct option.
Column-I Column-II
(a) Gregarious, polyphagous pest (i) Asterias
(b) Adult with radial symmetry and larva with bilateral symmetry (ii) Scorpion
(c) Book lungs (iii) Ctenoplana
(d) Bioluminescence (iv) Locusta
a.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
b.
(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
c.
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
d.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
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Match the trophic levels with their correct species examples in grassland ecosystem.
(a) Fourth trophic level (i) Crow
(b) Second trophic level (ii) Vulture
(c) First trophic level (iii) Rabbit
(d) Third trophic level (iv) Grass
Select the correct option.
a.
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
b.
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
c.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
d.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
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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)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
b.
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
c.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
d.
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
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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.
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
b.
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
c.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
d.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
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Identify the wrong statement with reference to immunity.
(1) Active immunity is quick and gives full response.
(2) Foetus receives some antibodies from mother, it is an example for passive immunity.
(3) When exposed to antigen (living or dead) antibodies are produced in the host's body. It is called 'Active immunity'.
(4) When ready-made antibodies are directly given, it is called 'Passive immunity'.
a.
Active immunity is quick and gives full response.
b.
Foetus receives some antibodies from mother, it is an example for passive immunity.
c.
When exposed to antigen (living or dead) antibodies are produced in the host's body. It is called 'Active immunity'.
d.
When ready-made antibodies are directly given, it is called 'Passive immunity'.
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Match the following columns and select the correct option.
Column-I Column-II
(a) Floating Ribs (i) Located between second and seventh ribs
(b) Acromion (ii) Head of the Humerus
(c) Scapula (iii) Clavicle
(d) Glenoid cavity (iv) Do not connect with the sternum
a.
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
b.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
c.
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
d.
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
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Match the following columns and select the correct option.
Column-I Column-II
(a) Floating Ribs (i) Located between second and seventh ribs
(b) Acromion (ii) Head of the Humerus
(c) Scapula (iii) Clavicle
(d) Glenoid cavity (iv) Do not connect with the sternum
a.
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
b.
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
c.
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
d.
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
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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 × 10⁹ bp, then the length of the DNA is approximately
a.
2.2 meters
b.
2.7 meters
c.
2.0 meters
d.
2.5 meters
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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 × 10⁹ bp, then the length of the DNA is approximately
a.
2.2 meters
b.
2.7 meters
c.
2.0 meters
d.
2.5 meters
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Match the following with respect to meiosis:
(a) Zygotene (i) Terminalisation
(b) Pachytene (ii) Chiasmata
(c) Diplotene (iii) Crossing over
(d) Diakinesis (iv) Synapsis
Select the correct option from the following:
a.
(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
b.
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
c.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
d.
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
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Match the following columns and select the correct option.
Column-I
(a) Organ of Corti
(b) Cochlea
(c) Eustachian tube
(d) Stapes
Column-II
(i) Connects middle ear and pharynx
(ii) Coiled part of the labyrinth
(iii) Attached to the oval window
(iv) Located on the basilar membrane
a.
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
b.
(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
c.
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
d.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
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Match the following:
(a) Inhibitor of catalytic activity
(b) Possess peptide bonds
(c) Cell wall material in fungi
(d) Secondary metabolite
(i) Ricin
(ii) Malonate
(iii) Chitin
(iv) Collagen
Choose the correct option from the following:
a.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
b.
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
c.
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
d.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
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