Class 12 Biology Multiple Choice Questions (2023-24)- SOLVED
Class 12 Biologists, assemble! Gear up for these MCQs and unleash your mastery of the living world. Prepare to navigate the depths of cellular secrets, unravel the tapestry of ecosystems, and conquer the wonders of evolution. Let's dive in!
Q1. An infertile couple was advised to undergo In vitro fertilization by the doctor. Out of the options given below, select the correct stage for transfer to the fallopian tube for successful results?
(a) Zygote only
(b) Zygote or early embryo up to 8 blastomeres
(c) Embryos with more than 8 blastomeres
(d) Blastocyst Stage
Q2. In which one of the following, both autogamy and geitonogamy are prevented?
(a) Wheat
(b) Papaya
(c) Castor
(d) Maize
Q3. How many of the following traits of the pea plant studied by Mendel are dominant?
Round seed, Constricted pod, yellow seed, white flower, green pod, terminal flower.
(a) 2
(b) 3
(c) 4
(d) 5
Q4. Blue eye colour is recessive to brown eye colour. In a population of 100 individuals, how many will have blue eye colour if the allelic frequency is 0.2, given that the population is in Hardy Weinberg equilibrium?
(a) 32
(b) 64
(c) 8
(d) 4
Q5. Which of the following amino acid residues will constitute the histone core?
(a) Lysine and Arginine
(b) Asparagine and Arginine
(c) Glutamine and Lysine
(d) Asparagine and Glutamine
Q6. The aquatic plant having long and ribbon-like pollen grains is:
(a) Vallisneria
(b) Hydrilla
(c) Eicchornia
(d) Zostera
Q7. To form a nucleoside, a nitrogenous base is linked to a pentose sugar,
(a) through a P glycosidic linkage at carbon atom number 1.
(b) through a P glycosidic linkage at carbon atom number 5.
(c) through a N glycosidic linkage at carbon atom number 1.
(d) through a N glycosidic linkage at carbon atom number 5.
Q8. Apis mellifera are killer bees possessing toxic bee venom. Identify the treatment and the type of immunity developed from the given table to treat a person against the venom of this bee.
Remedy Immunity
(a) Inactivated proteins Active
(b) Proteins of the venom Passive
(c) Preformed antibodies Passive
(d) Dead micro-organisms Active
Q9. Interferons are most effective in making non-infected cells resistant against the spread of which of the following diseases in humans?
(a) ascariasis
(b) ringworm
(c) amoebiasis
(d) AIDS
Q10. Read the following statements and select the correct one:
(a) The property of contact inhibition is shown by cancerous cells.
(b) The cancer patients are administered alpha interferon to destroy the tumour.
(c) The most feared property of the benign tumour is metastasis.
(d) Cancerous cells divide in a regulated manner.
Q11. Cultivation of Bt Cotton has been much in the news. The prefix ‘Bt’ here means
(a) ‘barium treated’ cotton seeds
(b) ‘bigger thread’ variety of cotton with better tensile strength
(c) produced by biotechnology using restriction enzymes and ligases from Bacillus thuringiensis
(d) carrying an endotoxin gene
Q12. The cause of Klinefelter's syndrome in humans is:
(a) Absence of Y-chromosome
(b) Absence of X-chromosome
(c) Extra copy of autosome
(d) Extra copy of X-chromosome
Q13. Humans have increased the extinction rate by a factor of
(a) 1000
(b) 10
(c) 100
(d) 10000
Q14. If N = population density at time t, then population density at time t + 1 can be written as:
𝑁𝑡+1 = 𝑁𝑡 + [(𝐴 + 𝑋) − (𝐵 + 𝑌)]
In the above equation,
(a) A is natality and Y is immigration.
(b) B is mortality and X is immigration.
(c) A is mortality and X is emigration.
(d) B is natality and Y is emigration.
Q15. Sea Anemone gets attached to the surface of the hermit crab. The population interaction in this case is
(a) amensalism.
(b) commensalism.
(c) mutualism.
(d) parasitism
Answers:
1. (b) Zygote or early embryo up to 8 blastomeres
2. (b) Papaya
3. (b) 3
4. (d) 4
5. (a) Lysine and Arginine
6. (d) Zostera
7. (c) through a N glycosidic linkage at carbon atom number 1.
8. (c) Preformed antibodies Passive
9. (d) AIDS
10. (b) The cancer patients are administered with alpha interferon to destroy the tumour.
11. (c) produced by biotechnology using restriction enzymes and ligases from Bacillus thuringiensis
12. (d) Extra copy of X-chromosome (Karyotype of 47 XXY)
13. (a) 1000
14. (b) B is mortality and X is immigration.
15. (b) commensalism.
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