A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be
a.
1000
b.
1800
Correct Answer
c.
225
d.
450
Step-by-Step AI Explanation
Verified Method
For a black body, P ∝ r^2T^4. Halving radius gives factor 1/4, doubling temperature gives factor 16. Net factor = 4, so power = 450 × 4 = 1800 W.
Q46mcq
A disease caused by an autosomal primary non-disjunction is
a.
Turner's syndrome
b.
Sickle cell anemia
c.
Down's syndrome
Correct Answer
d.
Klinefelter's syndrome
Step-by-Step AI Explanation
Verified Method
Down's syndrome is caused by autosomal non-disjunction, specifically trisomy 21.
Q47mcq
A dioecious flowering plant prevents both:
a.
geitonogamy and xenogamy
b.
cleistogamy and xenogamy
c.
autogamy and xenogamy
d.
autogamy and geitonogamy
Correct Answer
Step-by-Step AI Explanation
Verified Method
In dioecious plants male and female flowers occur on different plants, so self-pollination types like autogamy and geitonogamy are prevented.
Q48mcq
Attractants and rewards are required for
a.
Hydrophily
b.
Cleistogamy
c.
Anemophily
d.
Entomophily
Correct Answer
Step-by-Step AI Explanation
Verified Method
Insect-pollinated flowers commonly use attractants and rewards such as nectar and pollen.
Q49mcq
Alexander von Humboldt described for the first time
a.
Species-area relationships
Correct Answer
b.
Population growth equation
c.
Ecological biodiversity
d.
Laws of limiting factor
Step-by-Step AI Explanation
Verified Method
Humboldt observed that species richness increases with area, forming the basis of species-area relationship.
Q50mcq
Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?
a.
Chloroplast
b.
Mitochondrion
Correct Answer
c.
Lysosome
d.
Ribosome
Step-by-Step AI Explanation
Verified Method
Mitochondria are the site of aerobic respiration, where energy from carbohydrates is converted into ATP.
Q50mcq
Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?
a.
Chloroplast
b.
Mitochondrion
Correct Answer
c.
Lysosome
d.
Ribosome
Step-by-Step AI Explanation
Verified Method
Mitochondria are the site of aerobic oxidation of carbohydrates and generate ATP, so they are the energy-producing organelles of the cell.
Q51mcq
Zygotic meiosis is characteristic of
a.
Funaria
b.
Chlamydomonas
Correct Answer
c.
Marchantia
d.
Fucus
Step-by-Step AI Explanation
Verified Method
Chlamydomonas has a haplontic life cycle, so meiosis occurs in the zygote (zygotic meiosis).
Q51mcq
Zygotic meiosis is characteristic of
a.
Funaria
b.
Chlamydomonas
Correct Answer
c.
Marchantia
d.
Fucus
Step-by-Step AI Explanation
Verified Method
Chlamydomonas has a haplontic life cycle, in which the diploid zygote undergoes meiosis immediately after formation; this is zygotic meiosis.
Q52mcq
Good vision depends on adequate intake of carotene-rich food. Select the best option from the following statements: (a) Vitamin A derivatives are formed from carotene (b) The photopigments are embedded in the membrane discs of the inner segment (c) Retinal is a derivative of vitamin A (d) Retinal is a light-absorbing part of all the visual photopigments
a.
(a) and (c)
b.
(b), (c) and (d)
c.
(a) and (b)
d.
(a), (c) and (d)
Correct Answer
Step-by-Step AI Explanation
Verified Method
Carotene is converted to vitamin A derivatives; retinal is a vitamin A derivative and the light-absorbing part of visual photopigments. Statement (b) is incorrect.
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Good vision depends on adequate intake of carotene-rich food. Select the best option from the following statements:
(a) Vitamin A derivatives are formed from carotene.
(b) The photopigments are embedded in the membrane discs of the inner segment.
(c) Retinal is a derivative of vitamin A.
(d) Retinal is a light-absorbing part of all the visual photopigments.
a.
(a) and (c)
b.
(b), (c) and (d)
c.
(a) and (b)
d.
(a), (c) and (d)
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Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?
a.
Chromosomes will not segregate
b.
Recombination of chromosome arms will occur
c.
Chromosomes will not condense
d.
Chromosomes will be fragmented
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If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?
a.
33
b.
333
c.
1
d.
11
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Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation:
a.
X = 24, Y = 7 True ribs are dorsally attached to vertebral column but are free on ventral side
b.
X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side
c.
X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum
d.
X = 12, Y = 5 True ribs are attached dorsally to vertebral column and sternum on the two ends
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Adult human RBCs are enucleate. Which of the following statement(s) is/are the most appropriate explanation for this feature?
(a) They do not need to reproduce
(b) They are somatic cells
(c) They do not metabolize
(d) All their internal space is available for oxygen transport
a.
(a), (c) and (d)
b.
(b) and (c)
c.
Only (d)
d.
Only (a)
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Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?
a.
Mycoplasma
b.
Nostoc
c.
Bacillus
d.
Pseudomonas
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Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?
a.
Mycoplasma
b.
Nostoc
c.
Bacillus
d.
Pseudomonas
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Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections?
a.
Hormonal immune response
b.
Physiological immune response
c.
Autoimmune response
d.
Cell-mediated immune response
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Frog's heart when taken out of the body continues to beat for some time. Select the best option from the following statements: (a) Frog is a poikilotherm (b) Frog does not have any coronary circulation (c) Heart is myogenic in nature (d) Heart is autoexcitable.
a.
(a) & (b)
b.
(c) & (d)
c.
Only (c)
d.
Only (d)
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Match the following sexually transmitted diseases (Column I) with their causative agent (Column II) and select the correct option.
Column I / Column II
(a) Gonorrhea
(b) Syphilis
(c) Genital Warts
(d) AIDS
a.
(iv) (ii) (iii) (i)
b.
(iv) (iii) (ii) (i)
c.
(ii) (iii) (iv) (i)
d.
(iii) (iv) (i) (ii)
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The genotypes of a husband and wife are I^A I^B and I^A i. Among the blood types of their children, how many different genotypes and phenotypes are possible?
a.
4 genotypes ; 3 phenotypes
b.
4 genotypes ; 4 phenotypes
c.
3 genotypes ; 3 phenotypes
d.
3 genotypes ; 4 phenotypes
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The genotypes of a husband and wife are I^A I^B and I^A i. Among the blood types of their children, how many different genotypes and phenotypes are possible?
a.
4 genotypes ; 3 phenotypes
b.
4 genotypes ; 4 phenotypes
c.
3 genotypes ; 3 phenotypes
d.
3 genotypes ; 4 phenotypes
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A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?
a.
Pre-molars
b.
Molars
c.
Incisors
d.
Canines
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