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Sexual Reproduction in Flowering Plants Test - 89

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Sexual Reproduction in Flowering Plants Test - 89
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Endosperm is completely consumed by the developing embryo in
    Solution
    Correct option:

    Explanation:
    • Endosperm is completely consumed by developing embryo in the seed and the food reserve gets stored in the cotyledons. Such seeds are called non-endospermic or exalbuminous. Example- Pea and groundnut.
    • And in some seeds the endosperm persists to the mature seed stage as a storage tissue. These seeds are called endospermous or albuminous . Example- Maize and castor.

      Thus, Option A is correct.

  • Question 2
    1 / -0
    In flowering plants, both male and female gametes are non-motile. The method to bring them together for fertilisation is _________.
    Solution
    The transfer of pollen grains from the anther to the stigma is called pollination. Pollen grains are immobile. They cannot reach the stigma by themselves. An external agent is required for this. It can be wind, water, animal, gravity or growth contact.

    So, the correct answer is 'Pollination'.

  • Question 3
    1 / -0
    Identify the different parts of a typical dicot embryo labelled as A, B and C and select the correct option.

  • Question 4
    1 / -0
    In the embryos of a typical dicot and a grass, true homologous structures are?
  • Question 5
    1 / -0
    While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps would not be relevant?
    Solution
    Artificial hybridisation is human performed crossing of two different plants having complementary good traits in order to obtain an overall superior variety. Artificial hybridisation has been used by plant breeders for crop improvement programme. Two precautionary measures in artificial hybridisation are emasculation and bagging. Emasculation is removal of stamens from the floral buds so that chances of self pollination are eliminated. In case of dioecious (unisexual) plants, emasculation is not required as they have either male or female flowers.
    So, the correct answer is 'Emasculation'.
  • Question 6
    1 / -0
    A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by.
    Solution
    Light, non-sticky pollens produced in large numbers and long and feathery stigma are characteristics of anemophilous plants. Maize, Cannabis and many grasses are some of the example of this category.
  • Question 7
    1 / -0
    In cereals, one or few outermost layers of the endosperm become highly specialised morphologically and physiological and constitute the aleurone tissue. Which of the following statements regarding aleurone tissue(or aleurone cells) is incorrect?
    Solution
    The aleurone cells are characterized by the presence of thick walls and non-vacuolated cytoplasm interconnected by plasmodesmata. The most prominent organelles of these cells are aleurone grains, followed by sphaerosomes. Aleurone grains are surrounded by a single unit membrane which is closely associated with sphaerosomes. Aleurone grains possess two kinds of inclusion, besides the ground substance: (i) Globoids, present within the globoidal cavities, contain phytic and lipids; (ii) Protein-carbohydrate bodies, which are $$1-1.5\mu$$m in diameter. The ground substance also contains high concentration of protein, but it is less than that in the protein-carbohydrate bodies.
    Aleurone tissue has received considerable importance in studies of plant hormone action. During seed germination the reserve food (starch and protein) in the endosperm cells is digested by the activity of certain hydrolytic enzymes (amylases and proteases) which are secreted by the aleurone cells.
    So, the correct answer is 'Aleurone cells are characterised by the presence of thin walls and vacuolated cytoplasm with single small nucleus'.
  • Question 8
    1 / -0
    Read the following statements and select the correct option.
    Statement 1 Plants need the help of insects and animals for pollinating their flowers and dispersing their seeds.
    Statements 2 Plants offer rewards in the  form pollen and nectar for pollinators and juicy and nutritious fruits for seed disperses.
    Solution
    Plants themselves cannot move from one place too another Hence, they require help of insects to transfer pollen. In turn,they offer nectar and juicy fruits to the insects.
  • Question 9
    1 / -0
    Apomixis is:
    Solution
    Correct Option: D
    Explanation:

    • Apomixis is the formation of new individuals of seeds with embryo growing directly from diploid cells of nucellus or integument (as in Mango and Orange), diploid egg or some other gametophytic cell (as in Apple, Rubus, etc.).

    Hence, Apomixis is none of the given options.

  • Question 10
    1 / -0
    Nucellar polyembryony is reported in species of
    Solution
    It is a type of seed formation in which the nucellar cells that are present in the embryo divide and form many more embryos. These are the exact clones of the parents because these are formed from nucellar cells.
    Nuclear polyembryony is seen in the members of the citrus family.

    So, the correct option is 'Citrus'.
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