Test: Sexual Reproduction

10 Questions MCQ Test Biology Class 12 | Test: Sexual Reproduction

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Embryo sac is formed inside ______.

  • Embryo sac is formed in the ovule by the process of megasporogenesis and megagametogenesis.
  • During megasporogenesis, a diploid megaspore mother cell undergoes meiosis to form four haploid megaspores.
  • Three of these megaspores degenerate and one remains functional. The functional megaspore then develops into embryo sac or the female gametophyte and this is known as megagametogenesis.
  • The functional megaspore nucleus undergoes 3 meiotic divisions without cell wall formation and this results in 8 nuclei which get organized into egg apparatus, antipodal cells and the central cell. This forms a 7-celled but 8-nucleate structure which is the female gametophyte or embryo sac.

Thus, embryo sac occurs in the ovule.
So, the correct answer is B.

Embryo Sac:


Period of pregnancy is called ______.


Pregnancy, also known as gravidity or gestation. The pregnancy period is classified into three Trimester.

They are as follows:

  • First Trimester (0 to 13 Weeks).
  • Second Trimester (14 to 26 Weeks) is often called the "golden period" because many of the unpleasant effects of early pregnancy disappear.
  • Third Trimester (27 to 40 Weeks).

Menstrual cycle is completed in:

  • The average length of the menstrual cycle is 28–29 days, but this can vary between women and from one cycle to the next.
  • The length of your menstrual cycle is calculated from the first day of your period to the day before your next period starts.

Cleistogamous flowers are:

  • Cleistogamy is a type of automatic self-pollination of certain plants that can propagate by using non-opening, self-pollinating flowers.
  • Especially well known in peanuts, peas, and pansy this behavior is most widespread in the grass family.
  • However, the largest genus of cleistogamous plants is Viola.

Which of the following is a hermaphrodite?

  • In biology, a hermaphrodite  is an organism that has complete or partial reproductive organs and produces gametes normally associated with both male and female sexes. 
  • Many taxonomic groups of animals (mostly invertebrates) do not have separate sexes. In these groups, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the "female" or "male." For example, the great majority of tunicates, pulmonate snails, opisthobranch snails, earthworms and slugs are hermaphrodites.
  • Hermaphroditism is also found in some fish species and to a lesser degree in other vertebrates. Most plants are also hermaphrodites.

In males, urethra carries ______.

  • The urethra is the tube that carries urine from the bladder to outside of the body.
  • In males, it has the additional function of ejaculating semen when the man reaches orgasm.
  • When the penis is erect during sex, the flow of urine is blocked from the urethra, allowing only semen to be ejaculated at orgasm.

Therefore, Option D is the correct answer.
Overview of the Male Anatomy | Johns Hopkins Medicine


When seeds are attached to the parent plant, the type of germination is known as _______.

  • Usually plants multiply by dispersion of seed through agencies like air, water, bird droppings or seed simply falls on ground near the parent plant and gives rise to a new plant.
  • But in certain conditions seed cannot germinate if it falls down, like in the case of marshy areas or sea coast. Mangrove plants show vivipary i.e. seeds germinate while they are still attached to the parent plant. The seedling then, falls into water (due to increase in its weight) and develops roots.
  • Example: Rhizophora, Sonneratia etc.

External fertilisation occurs in the majority of ______.

  • External fertilization usually occurs in aquatic environments where both eggs and sperm are released into the water. After the sperm reaches the egg, fertilization takes place.
  • Algae are simple without thallus, autotrophic non-vascular plants having unisexual organs and no embryo formation.
  • The sexual reproduction in algae is of three types: isogamy, anisogamy and oogamy.Here the gametes are formed and the fertilization of gametes takes place outside the algal body.

So, the correct option is 'algae'.


What are the 3 phases in a life cycle (in order)?


There are 3 phases in a life cycle:

  1. Juvenile phase/ vegetative phase: Period from birth to maturation of reproductive systems.
  2. Reproductive Phase: Period when the reproductive systems have matured and ready to produce offspring.
  3. Senescence: Period when the organism starts growing old and starts degrading.

The product of sexual reproduction generally generates______.

  • Sexual reproduction leads to new genetic combination leading to variation in new products.
  • The longer viability of seeds, prolonged dormancy and large biomass are not related to sexual reproduction.

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