CBSE Questions for Class 12 Medical Biology Reproduction In Organisms Quiz 6 - MCQExams.com

Identify from the following group of animals which exhibit oestrus cycle
  • Lion, deer, dog and cow
  • Cow, monkey, elephant and ape
  • Monkey, ape, man and elephant
  • Lion, dog, monkey and ape
Process of sexual reproduction which involves meiosis and syngamy is
  • Apomixis
  • Amphimixis
  • Agamospermy
  • Diplospory
In sexual reproduction of algae fusion between one large, non-motile (static) female gamete and a smaller motile male gamete is termed as
  • Isogamous
  • Anisogamous
  • Oogamous
  • None of these
Fertilisation was first discovered by
  • Aristotle
  • Leeuwenhoek
  • Harvey
  • Pander
The type of syngamy in Trichonympha is
  • Hologamy
  • Anisogamy
  • Isogamy
  • Conjugation
In $$28$$ day human ovarian cycle, ovulation occurs on.
  • Day $$1$$
  • Day $$5$$
  • Day $$14$$
  • Day $$28$$
If Hydra is broken into pieces, _________. 
  • Hydra will die. 
  • Hydra will undergo sexual reproduction. 
  • Some fragments will form complete Hydra. 
  • Every fragment will, grow into a complete Hydra. 
Why is it important for plants to scatter or disperse their seeds?
  • To avoid overcrowding which results in unhealthy plants
  • To prevent the seeds from becoming parasites to the parent plants
  • To ensure that plants get spread to new places
  • Both A and C
Nucellar embryos found in Citrus sp. are.
  • Parthenogenesis
  • Aposporous
  • Apogamous
  • Adventive
Which of the following is correct?
  • Menstrual cycle is present in all mammals.
  • Menstrual cycle is present in all primates.
  • Estrus cycle occurs in all mammals.
  • Most mammals are ovoviviparous.
Which one of the following wavelengths is more effective for the photo morphogenetic phenomenon?
  • $$730$$nm
  • $$680$$nm
  • $$660$$nm
  • $$560$$nm
Match List I with List II and select the correct answer using the codes given the lists.
List-I(Meaning)List-II(Phenomenon)
a. Embryos arise directly from diploid saprophytic cells(nucleus or integuments)$$1$$. Parthenogenesis
b. An archesporium differentiates but the megaspore mother cell develops into an unreduced embryo sac$$2$$. Polyembryony
c. Many embryos arising in one ovule$$3$$. Adventitious embryony
d. The development of embryo from unfertilized egg$$4$$. Diplospory
  • A-$$1$$, B-$$2$$, C-$$3$$, D-$$4$$
  • A-$$3$$, B-$$4$$, C-$$2$$, D-$$1$$
  • A-$$3$$, B-$$2$$, C-$$4$$, D-$$1$$
  • A-$$3$$, B-$$1$$, C-$$4$$, D-$$2$$
Lectin of pollen is involved in _____________.
  • Parthenogenesis
  • Pollen sterility
  • Pollen allergy
  • Self-incompatibility
Union between a large non-motile female gamete and a small motile male gamete is called ____________.
  • Anisogamy
  • Isogamy
  • Oogamy
  • Zoogamy
Which of the following is incorrect about fertilization?
  • It restores diploid condition.
  • It activates egg.
  • There is no variation.
  • It determines sex of offspring.
___________ is a life process that is not essential for an individual's survival but for survival of the species.
  • Growth
  • Reproduction
  • Respiration
  • Nutrition
Choose the correct answers from the alternatives given.
Protostomes development includes all of the following except:
  • spiral cleavage
  • daughter cells sit in grooves formed by prior cleavage
  • cell fate is fixed and can develop in only one way
  • radial cleavage
The statement 'nothing lives forever, yet life continues' illustrates the role of ______________.
  • Embryogenesis
  • Morphogenesis
  • Replication
  • Reproduction
Menstrual cycle is not seen in ____________.
  • Humans
  • Orangutans
  • Lemurs
  • Chimpanzees
Select the correct option:
On very special feature in the earthworm is that:
  • fertilization of eggs occurs inside the body
  • the typhlosole greatly increases the effective absorption area of intestine
  • the S-shaped setae embedded in the integument are the defensive weapons used against the enemies
  • it has a long dorsal tubular heart.
Fusion of two motile gametes which are dissimilar in size is termed as
  • oogamy
  • isogamy
  • anisogamy
  • zoogamy
Refer to the given showing levels of different hormones $$(P-S)$$ during menstrual cycle in a normal woman.
Identify the hormones $$P-S$$ and select the incorrect statement regarding them.
771337_c54c46ea7de0427d954755c2a494ea40.png
  • $$R$$ stimulates the ovarian follicles to produce estrogen during proliferative phase while $$Q$$ stimulates the corpus luteum of the ovary to secrete progesterone
  • Menstrual phase is caused by the reduction of $$P$$ and $$S$$
  • Proliferative phase is characterised by increased production of $$S$$ whereas secretory phase is charaterised by increased production of $$P$$
  • In males. $$Q$$ causes spermatogenesis whereas $$R$$ stimulates Leyding's cells to secrete testosterone
Following table summarises the differences between self-fertilisation and cross-fertilisation. Pick out the wrong difference.
  • Self-fertilisation - It is uniparental, Cross-fertilisation - It is biparental
  • Self-fertilisation - It involves the fusion of male and female gametes of the same parent, Cross-fertilisation - It involves the fusion of two gametes produced by different parents
  • Self-fertilisation - Examples : Pheretima, Periplaneta, Cross-fertilisation - Examples : Taenia, Rana tigrina
  • None of the above
Read the following statements about the reproductive cycles in mammals and select the correct ones.
(i) Oestrous cycle occurs in primate mammals.
(ii) In species with oestrous cycle, females are generally sexually active during oestrous phase.
(iii) Both the cycles show monthly recurrence.
  • (i) and (ii)
  • (ii) and (iii)
  • (ii) only
  • (i), (ii) and (iii)
Which of the following is not correct regarding sexual reproduction?
  • It is usually biparental.
  • Gametes are always formed.
  • It is a slow process.
  • It involves only mitosis.
Oestrous cycle is reported in
  • Cows and sheep
  • Humans and monkeys
  • Chimpanzees and gorillas
  • Humans and cows
Development of new individual from female gamete without fertilisation is termed as
  • Syngamy
  • Embryogenesis
  • Oogamy
  • Parthenogenesis
Life begin in all sexually reproducing organisms as a
  • Single-celled zygote
  • Double-celled zygote
  • Haploid zygote
  • Haploid gametes
Asexual reproduction is seen in members of Kingdom.
  • Monera
  • Plantae
  • Animalia
  • All of these
Match the column I with column II.
Column IColumn II
(P) External fertilisation(i) Earthworm
(Q) Internal fertilisation(ii) Cockroach
(R) Bisexual(iii) Frogs and Fishes
(S) Unisexual(iv) Birds and mammals
  • $$P - (iv), Q - (iii), R - (i), S - (ii)$$
  • $$P - (iv), Q - (iii), R - (ii), S - (i)$$
  • $$P - (iii), Q - (iv), R - (ii), S - (i)$$
  • $$P - (iii), Q - (iv), R - (i), S - (ii)$$
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