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12th Grade > Biology

GROWTH & REPRODUCTION IN PLANTS AND ANIMALS MCQs

Plant Growth And Development, Reproduction In Animals, Sexual Reproduction In Flowering Plants

Total Questions : 111 | Page 1 of 12 pages
Question 1. Which of the following is not a characteristic of  sexual reproduction?
  1.    Biparental
  2.    Accounts for variation
  3.    Genetically different from parents
  4.    No fertilisation
 Discuss Question
Answer: Option D. -> No fertilisation
:
D
In sexual reproduction, one male gamete and one female gamete fuse to form the zygote and this process is called fertilisation. The zygote undergoes several cell divisions to form a new individual. The new individuals (offsprings) formed are genetically and morphologically different from the parents.. Hence, sexual reproduction accounts for variation.
Question 2. Budding is seen in ________ .
  1.    humans
  2.    amoeba
  3.    hydra
  4.    bacteria
 Discuss Question
Answer: Option C. -> hydra
:
C
Hydra may have one or more bulges or outgrowths on it's body. These outgrowths called buds, whichdevelop intonew individuals. Once the buds mature, the new individualsdetach from the parent organism. This mode of asexual reproduction is called budding.
Budding Is Seen in ________ .
Question 3. Which among the following are highly evolved plants on earth?
  1.    Gymnosperms
  2.    Angiosperms
  3.    Bryophytes
  4.    Pteridophytes
 Discuss Question
Answer: Option B. -> Angiosperms
:
B
Angiosperms include about 250,000 species and are the most recently and highly evolved plants on Earth. Genetic variation is easily possible only in the case of sexual reproduction as it involves the fusion of genetically unique male and female gametes. And since variations and adaptations are the primary drivers for evolution, this has led to angiosperms becoming highly evolved plants.
Question 4. The mitocytes, meiocytes and meiospores present in the anther respectively are
  1.    Pollen tetrads, sporogenous cells, microspores
  2.    Sporogenous cells, pollen mother cells, pollen grains
  3.    Microspores, pollen grains, sporogenous cells
  4.    Microspore mother cell, microspores, pollen grains
 Discuss Question
Answer: Option B. -> Sporogenous cells, pollen mother cells, pollen grains
:
B
Sporogenous tissue undergoes mitosis and forms pollen mother cells (PMC) ormitocytes. These mitocytesundergo meiosis and formhaploid microspores(meiocytes) that ultimately mature andformpollen grains that are also termedmeiospores.
Question 5. What does the following diagram indicate?
What Does The Following Diagram Indicate?
  1.    Apomixis technique can not be used to produce pure lines
  2.    Apomixis is similar to self pollination and can lead to stagnation of species
  3.    Apomixis technique is more advantageous than sexual reproduction to produce new variety
  4.    None of the above
 Discuss Question
Answer: Option B. -> Apomixis is similar to self pollination and can lead to stagnation of species
:
B
In many plants, the normal process of sexual reproduction is substituted by an asexual process and as a result seeds are produced without fertilisation. This phenomenon of substituting the usual sexual process by asexual methods is known as Apomixis and plants which show this condition are called apomictic plants. Self-pollination and apomixis lead to no genetic recombination and produce pure lines similar to the parent plant.
Question 6. If a pea plant ovary has 20 ovules. Then the maximum number of (i) megaspores and (ii) functional megaspores in that ovary will be
  1.    (i) 80  & (ii) 20
  2.    (i )20   & (ii) 20
  3.     (i) 100 & (ii) 80
  4.    (i) 800 & (ii) 200
 Discuss Question
Answer: Option A. -> (i) 80  & (ii) 20
:
A
Total megaspores produced by 20 ovules = 20 × 4 = 80.
In each tetrad only one is functional megaspore.
Therefore, the no. of functional megaspores = 20.
Question 7. Which of the following shows triploid nature in flowering plants?
  1.    Megaspore
  2.    Microspore
  3.    Embryo
  4.    Endosperm
 Discuss Question
Answer: Option D. -> Endosperm
:
D
Fertilisation in angiosperms involves two important events - synagamy and triple fusion. In syngamy, the egg (n) and the sperm (n) fuse in the embryo sac to form a diploid zygote which develops into an embryo and in triple fusion, another sperm (n) released in the embryo sac fuses with central nucleus (2n) to form triploid primary endosperm nucleus which develops into an endosperm. Microspore and megaspore are the haploid spores which further develop or become gametophytes in flowering plants.
Question 8. Identify the labelled parts in the given figure.
Identify The Labelled Parts In The Given Figure.
  1.    (i)-Epicarp, (ii)-Seed, (iii)-Endocarp, (iv)-Mesocarp
  2.    (i)-Thalamus, (ii)-Fruit, (iii)-Pericarp, (iv)-Endocarp
  3.    (i)-Thalamus, (ii)-Mesocarp, (iii)-Endocarp, (iv)-Seed
  4.    (i)-Epicarp, (ii)-Endocarp, (iii)-Seed, (iv)-Mesocarp
 Discuss Question
Answer: Option C. -> (i)-Thalamus, (ii)-Mesocarp, (iii)-Endocarp, (iv)-Seed
:
C
Apple is afalse fruit where the entire fruit develops from the thalamus. Thefruit wall is differentiated intoouter epicarp, middle mesocarp andinner endocarp. Inner to the endocarp is the ovary which houses the seeds.
Question 9. Polyembryony can be used to raise
  1.    Virus-free clones
  2.    Non-parental type seedlings
  3.    A single embryo in the embryo sac
  4.    All of the above
 Discuss Question
Answer: Option A. -> Virus-free clones
:
A
Polyembryony is the formation of more than one embryo from a single fertilised ovum or in a single seed. Polyembryony is of great significance in horticulture and plant breeding.We know that in vegetative propagation new plants obtained can be considered as a clone of the parent plant. Similar to this polyembryony also produces uniform seedlings of the parental type. The clones formed are also free from diseases. In fact polyembryony is the only practical approach to raise virus-free clones.
Question 10. The formation of secondary meristems; interfascicular cambium and cork cambium from differentiated parenchyma cells is dedifferentiation.
  1.    True
  2.    False
  3.    Both extrinsic and intrinsic factors
  4.    Neither extrinsic nor intrinsic factors
 Discuss Question
Answer: Option A. -> True
:
A
The living differentiated cells that by now have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as dedifferentiation.

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