CBSE Questions for Class 12 Medical Biology Reproduction In Organisms Quiz 7 - MCQExams.com

Given figure of Hydra shows its reproductive structures and manner of fertilisation.
Observe and answer that why is it not showing self fertilisation?
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  • Distance between testis and ovary is more
  • Sperms do not swim downwards
  • Ovary matures earlier than testis
  • Testis matures earlier than ovary
Identify X in the given figure. 
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  • Roots
  • Eyes
  • Branches
  • Leaves
Male and female, both gametes arise from the same parent in
  • Rabbit
  • Humans
  • Taenia
  • None of the above
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
A dandelion produces seeds without meiosis or fertilisation. The adult sporophyte forms diploid, rather than haploid, megaspores that develop into ovules containing diploid, rather than haploid nuclei. One of the nuclei in each ovule becomes an egg and develops directly, without fertilisation, into an embryo that is genetically identical to its parent. This type of reproduction is called ____________________.
  • Parthenogenesis, which is a form of apomixis
  • Parthenogenesis, which is a form of amphimixis
  • Adventive embryony, which is a form of apomixis
  • Agamosphermy, which is a form of amphimixis
Repair of endometrium is undertaken by _________.
  • LH
  • FSH
  • Estrogen
  • Prolactin
The life span of a parrot is ________.
  • 25 yrs
  • 50 yrs
  • 140 yrs
  • 15 yrs
What is the common method of propagation in $$Bryophyllum$$ ?
  • Vegetative propagation
  • Fragmentation
  • Spore formation
  • Budding
Parthogenesis is the development of an organism directly from :
  • Female gametes.
  • Vegetative cells
  • Fertilised ovum
  • None of the above
Vegetative reproduction by layering can be done in:
  • Jasmine
  • Mango
  • Rose
  • All of the above
The time for optimum chances of conception in a woman is starting from the day of menstruation.
  • 1st day
  • 4th day
  • 14th day
  • 26th day
Select the wrong statement:
  • Isogametes are similar in structure, function and behavior.
  • Anisogametes differ either in structure, function and behavior.
  • In oomycetes, the female gamete is smaller and motile, while the male gamete is larger and non-motile.
  • Chlamydomonas exhibits both isogamy and 1, anisogamy and Fucus shows oogamy.
Read the following statements $$1$$ and $$2$$ and identify the correct one.
$$(1)$$ In bees parthenogenetic zygote develops into monoploid male
$$(2)$$ The fertilised egg develops into diploid female.
  • $$1$$ is correct, $$2$$ is not correct
  • Only $$2$$ is correct
  • Both $$1$$ and $$2$$ are incorrect
  • Both $$1$$ and $$2$$ are correct
Which one of the following parts of the plant when put into the soil is likely to produce a new plant?
  • Pedicel
  • A stem with a node
  • Root hair 
  • Part of a flower
The 'eye' of the potato plant is what 
  • The root is to any plant.
  • The bud is to a flower.
  • The bud is to Bryophyllum leaf.
  • The anther is to stamen.
In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is 
  • Ovum
  • embryo
  • Foetus
  • zygote
Mark the correct one.
  • Labeo- Internal fertilization
  • Frog - Internal fertilization
  • Birds - External fertilization
  • Balaenoptera - Internal fertilization
Vegetative reproduction is found in: 
  • Potato
  • Wheat
  • Neem
  • Pea
Which one of the following organisms reproduces sexually only once in its life time?
  • Banana plant
  • Mango
  • Tomato
  • Eucalyptus
Placing seeds on or in the ground for future growth is called_______
  • Fragmentation
  • Budding
  • Sowing
  • Reproduction
If the pollen lands on the stigma of the same flower it is called cross-pollination.
  • True
  • False
Parthenogenesis is the development of a female egg into a new individual without the contribution of a male set of chromosomes.
In a hypothetical pond, two populations of fish are found; one reproduces through sexual reproduction, the other through parthenogenesis. Initially, the parthenogenetic fish are a larger population when the pond is first studied. However, researchers soon observe that the parthenogenetic fish are more frequent hosts for a new blood-borne parasite than the sexually reproducing fish. As a result, the sexually reproducing population increases and the parthenogenetic population decreases.
Which of the following best explains the reason for the shift in population numbers?
  • Sexual reproduction increases genetic variation. Some individuals in the sexually reproducing population will be adapted to a change in environment, in this case, the addition of a new parasite. These individuals will survive and reproduce at a higher rate than those affected by the parasite.
  • The asexual fish are more susceptible to the parasites because they are an all female population, and typically less aggressive. The sexually reproducing population is protected by aggressive adult males fighting off the invading parasites.
  • The asexually reproducing fish are intentionally reducing their population density as a mechanism to slow the spread of the parasite.
  • The sexually reproducing population can reproduce faster than the parthenogenesis population, allowing them to produce so much offspring that not all can be affected by the new parasite.
Which of the following is correct about internal fertilization and external fertilization?
  • Internal fertilization- Fertilization inside the female body, External fertilization- Fertilization outside the female body.
  • Internal fertilization- Fertilization outside the female body, External fertilization- Fertilization inside the female body.
  • Internal fertilizatlon- Chances of the survival of the offspring are more, External fertilization- Chances of survival of the offspring are less.
  • Both A and C
Megha and Farheen were performing an experiment on plant reproduction. They both placed a potato in the soil and observed the changes after a few days. Which of the following will they observe?
  • Young roots will rise from the potato.
  • Young shoots will rise from the potato.
  • Potato will increase in number.
  • Both A and B
Identify from the following group of animals, which exhibit estrous cycle.
  • Lion, deer, dog and cow
  • Cow, monkey, elephant and ape
  • Monkey, ape, man and elephant
  • Lion, dog, monkey and ape
An aphid has two modes of reproduction; sexual, when food is sufficient and .............., when there is scarcity of food and uncrowded.
  • Budding
  • Fragmentation
  • Parthenogenesis
  • Gemmules
Which of the following statement can be related to metestrus phase of an estrus cycle?
  • The hypertrophy of glands of uterine mucosa
  • Corpus luteum develops
  • In absence of fertilisation the corpus luteum degenerates
  • All of the above
Which of the following statement is true?
A) Sexual receptivity occurs all through the menstrual cycle.
B) Estrus prepares the female reproductive tract for copulation.
C) The hypertrophic lining is sloughed off as menstrual flow.
  • Only A
  • Both A and B
  • Both A and C
  • Both B and C
In apomictic/parthenogenetic development the individuals are
  • Morphologically and genetically similar
  • Morphologically and genetically different
  • Morphologically similar but genetically different
  • None of the above
Proestrus bleeding in dogs is caused due to 
  • Increase of the estradiol-17 hormone
  • Inflammatory response of WBC
  • Ovulation
  • All of the above
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