MCQ Questions for Class 12 Biology: Ch 1 Reproduction in Organisms

MCQ Questions for Class 12 Biology: Ch 1 Reproduction in Organisms

1. A human female reaches menopause around the age of:
(a) 70 years
(b) 50 years
(c) 25 years
(d) 15 years
► (b) 50 years

2. In an egg, the type of cleavage is determined by
(a) Shape and size of the sperm
(b) Size and location of the nucleus
(c) Amount and distribution of yolk
(d) Number of egg membranes
► (c) Amount and distribution of yolk

3. The membranous cover of the ovum at ovulation is:
(a) Zona pellucida
(b) Zona radiata
(c) Corona radiata
(d) Chorion
► (c) Corona radiata

4. In grafting, the portion to be grafted on the main plant is called
(a) Stock
(b) Scion
(c) Stem
(d) Adventitious bud
► (b) Scion

5. Eye lens is formed from
(a) Ectoderm
(b) Mesoderm
(c) Endoderm
(d) Ectoderm and Mesoderm
► (a) Ectoderm

6. The chances of survival of young one is greater in ________ organism.
(a) Gemmules  
(b) Omniparous
(c) Viviparous
(d) Oviparous
► (c) Viviparous

7. In diploid organism, gametes are produced by meiosis division but in haploid organism gametes are produced by:  
(a) Mitosis
(b) Meiosis
(c) Both (a) and (b) 
(d) Reduction division
► (a) Mitosis

8. Vegetative propagation in mint occurs by
(a) Sucker
(b) Rhizome
(c) Offset
(d) Runner
► (a) Sucker

9. Senescence in most of the animals is NOT caused by _____.
(a) Wear and tear
(b) Genetic damage
(c) Lack of Nutrition
(d) Loss of metabolism
► (c) Lack of Nutrition

10. Syngamy can occur outside the body of the organism in:
(a) Fungi
(b) Mosses
(c) Algae
(d) Ferns
► (c) Algae

11. Budding is a method of asexual reproduction found in
(a) Hydra
(b) Honey bee
(c) Bacteria
(d) Virus
► (a) Hydra

12. During regeneration, modification of an organ to other organ is known as
(a) Morphogenesis
(b) Epimorphosis
(c) Morphallaxis
(d) Accretionary growth
► (b) Epimorphosis

13. External fertilisation occurs in the majority of
(a) Algae
(b) Fungi
(c) Mosses
(d) Liverworts
► (a) Algae

14. In males, urethra carries
(a) Urine only
(b) Sperms only
(c) Both of these
(d) None of the above
► (c) Both of these

15. Which of the following is NOT correct about artificial means of vegetative propagation?   
(a) Quick production of new plants
(b) Combining good qualities of two different varieties
(c) Economical
(d) Genetic variation
► (d) Genetic variation

16. Identify the wrong statement from the following.
(a) High level of estrogen triggers the ovulatory surge.
(b) Oogonial cells start to proliferate and give rise to functional ova in regular cycle puberty onwards.
(c) Sperms released from seminiferous tubules are poorly motile/non-motile.
(d) Progesterone level is high during the post ovulatory phase of menstrual cycle.
► (b) Oogonial cells start to proliferate and give rise to functional ova in regular cycle puberty onwards.

17. A flower having both male and female reproductive parts are termed as______.  
(a) Heterolithic
(b) Monoecious
(c) Homolithic   
(d) Dioecious
► (b) Monoecious

18. Which one of the following pairs of plant structure has haploid number of chromosome?   
(a) Nucellus and antipodal cells
(b) Egg nucleus and secondary nucleus
(c) Egg and antipodal cells
(d) Megaspore mother cell and antipodal cell
► (c) Egg and antipodal cells

19. Select the wrong statement: 
(a) Anisogametes differ either in structure, function or behaviour.
(b) In Oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile.
(c) Chalmydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy.
(d) Isogametes are similar in structure, function and behaviour.
► (b) In Oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile.

20. Menstrual cycle is completed in
(a) 28 days
(b) 31 days
(c) 27 days
(d) 30 days
► (a) 28 days

21. What is common between vegetative reproduction and apomixis?
(a) Both are applicable to only dicot plants
(b) Both bypass the flowering phase
(c) Both occur round the year
(d) Both produces progeny identical to the parent
► (d) Both produces progeny identical to the parent

22. Termination of gastrulation is indicated by
(a) Obliteration of blastocoel
(b) Obliteration of archenteron
(c) Closure of blastopore
(d) Closure of neural tube
► (a) Obliteration of blastocoel

23. Which of the following is developed by parthenogenesis:
(a) Drones
(b) Queen honey bee
(c) Worker honey bee
(d) Both (b) and (c)
► (a) Drones

24. An edible part of cauliflower is
(a) Inflorescence
(b) Bract
(c) Leaves
(d) Bud
► (a) Inflorescence

25. What is true about cleavage in the fertilized egg of humans?
(a) Meroblastic
(b) Starts when egg reaches uterus
(c) Starts in fallopian tube
(d) It is identical to normal mitosis
► (c) Starts in fallopian tube

26. Meroblastic cleavage refers to which type of division of egg?
(a) Complete
(b) Incomplete
(c) Horizontal
(d) Spiral
► (b) Incomplete

27. Which plant can propagated Vegetatively by leaf?   
(a) Bryophyllum
(b) Chrysanthemum
(c) Agave
(d) Asparagus
► (a) Bryophyllum

28. Which type of vegetative propagation is present in bamboo?   
(a) Offset
(b) Offspring
(c) Sucker
(d) Runner
► (c) Sucker

29. Which one of the following is correctly matched?
(a) Onion - Bulb
(b) Ginger - Sucker
(c) Chlamydomonas - Conidia
(d) Yeast - Zoospores
► (a) Onion - Bulb

30. The female gametophyte in angiosperm is also known as _______.
(a) Egg
(b) Embryo sac
(c) Carpel
(d) Ovule
► (b) Embryo sac

31. Monoecious plant of Chara shows occurrence of :
(a) Stamen and carpel of the same plant
(b) Upper antheridium and lower oogonium on the same plant
(c) Upper oogonium and lower antheridium on the same plant
(d) Antheridiophore and archegoniophore on the same plant
► (c) Upper oogonium and lower antheridium on the same plant

32. Apomixis means_____.   
(a) Formation of seeds without fusion of gamete
(b) Sexual reproduction
(c) Formation of seedless fruit
(d) Vegetative propagation
► (a) Formation of seeds without fusion of gamete

33. What is true about cells during cleavage?
(a) They move from animal pole to vegetal pole
(b) They do not grow in size
(c) They consume little O2
(d) Their divisions resemble ordinary mitosis
► (b) They do not grow in size

34. What is true for cleavage?
(a) Size of embryo increases
(b) Size of cells decrease
(c) Size of cells increase
(d) Size of embryo decreases
► (b) Size of cells decrease

34. Which of the following is prevented by unisexuality of flowers?  
(a) Both xenogamy and geitonogamy
(b) Autogamy and geitonogamy
(c) Autogamy but not geitonogamy
(d) Geitonogamy but not xenogamy
► (c) Autogamy but not geitonogamy

35. The growing embryo (foetus) obtains nutrition from mother's body from
(a) Amnion
(b) Placenta
(c) Amniotic fluid
(d) Heart
► (b) Placenta

36. Blastopore is the opening of
(a) Coelenteron
(b) Coelom
(c) Blastocoel
(d) Archenteron
► (d) Archenteron
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