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Sexual Reproduction in Flowering Plants Test - 99

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Sexual Reproduction in Flowering Plants Test - 99
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  • Question 1
    1 / -0
    Which of the following species has nucellar embryology?
    Solution
    Nucellar embryony or polyembryony refers to the development of the seeds from embryos produced by the nucellar tissue that surrounds the megagametophytes. These additional embryos or polyembryony is genetically identical to the parent plant and the nucellar seedlings are the clones of the parent. This is a genetic trait and is a form of seed production that occurs in many species of citrus plants.  
    So, the correct answer is option A.
  • Question 2
    1 / -0
    Prolonged use of seeds of Lathyrus sativus causes a debilitating disorder due to presence of
    Solution
    Lathyrism is a disease caused by eating seeds of species of Lathyrus (the grass pea), mainly L. sativus (the chickpea or khesari), L. cicera (flat-podded vetch) and L. clymenum (Spanish vetchling). It affects mostly people in Bangladesh, India, Pakistan, Nepal and Algeria but is sometimes found in France, Italy, Spain and Australia. This disease affects horses and cattle as well as in man.
    Beta-Oxalyl-amino-L-alanine acid (BOAA), an excitatory neurotoxin and glutamate agonist, has been identified as the constituent of the chick pea responsible for the disease. BOAA appears to exert its effects through mitochondrial toxicity.
    Prolonged use of seeds of Lathyrus sativus causes a debilitating disorder is not due to presence of glucodsinolates, amygdalin and cyanogenic glucosides. 
    Therefore, the correct answer is option C.
  • Question 3
    1 / -0
    After culturing the anther of a plant, a few diploid plants were got along with haploid plants. Which of the following parts might have given rise to diploid plants? 
    Solution
    When the anther is used as the explant material for the cultivation of new plants by the tissue culture technique, then there are some plants which are developed as haploid and the other plants are developed as the diploid plants. There are different types of tissues which are present in the anther. The pollen grains and the respective cells like the vegetative cell and generative cell will give rise to the plants which are haploid because they are formed through spermatogenesis. The other cells like the cells of anther wall, endothecium, middle layers are diploid in nature and give rise to diploid plants.
  • Question 4
    1 / -0
    In coconut brown covering (thin layer) adherent to the kernel around the endosperm is
    Solution
    In coconut brown covering (thin layer) adherent to the kernel around the endosperm is seed coat. A seed coat protects the internal parts of the seed from fungi, bacteria and insects and prevents water loss. The seed coat must split open before a new plant may emerge. The outer layer of the seed coat, called the testa, is generally hard and thick. The second layer of the seed coat, known as the tegmen, is softer. In some plants, the seed coat does not open unless environmental conditions are ideal for plant growth. This condition is known as dormancy. In many plants, the seed coat covers storage tissues. The embryonic plant uses these food reserves until it is able to emerge from the seed coat and make its own food. Coconuts are classified as a fibrous one-seeded drupe. A drupe is a fruit with a hard stony covering enclosing the seed (like a peach or olive) and comes from the word drupa meaning overripe olive. A coconut, and all drupes, have three layers:  the exocarp (outer layer), the mesocarp (fleshy middle layer), and the endocarp (hard, woody layer that surrounds the seed). Thus the correct answer is B.

  • Question 5
    1 / -0
    Pollination by bats is called as
    Solution
    Pollination by bats is called as Chiropterophily. Flowers that are pollinated by this mechanism usually are usually pale and nocturnal. The advantage of pollination by bats is that they do long distance dispersal of pollen along with depositing huge amount of pollen on the stigmas.
    So, the correct answer is, 'Chiropterophily'.
  • Question 6
    1 / -0
    Coconut water from a tender coconut is
    Solution
    Tender coconut water is a clear liquid found inside of the young tender coconut. During the nuclear phase of the development, it provides as a termination for the endosperm of the coconut. In the nuclear endosperm formation, free-nuclear divisions are repeatedly done; if a cell wall is developed it will form after free-nuclear divisions. Commonly referred to as liquid endosperm. Coconut water from a tender coconut is an example of this process i.e, free nuclear endosperm.
    So, the correct answer is option C.
  • Question 7
    1 / -0
    The insect Blastophaga grossorum is associated with the pollination of
    Solution
    There is a tight mutual dependence between the Ficus species and an insect called Blastophaga grossorum that pollinates it. It is known as Coevolution. This relationship has developed and is persistent for millions of years now.
    So, the correct answer is, 'Ficus'.
  • Question 8
    1 / -0
    The mechanism of fertilization involves different events like approximation of gametes, acrosomal reaction activation of egg and amphimixis. According to F.R. Lillie approximation occurs due to interacting complementary substances called as fertilizin and anti fertilizin.
    During amphimixis many events occur. Choose the incorrect event from the following events.
    Solution
    • F.R. Lillie proposed fertilization theory in 1914 which is based on sea urchins. 
    • According to this theory, an egg (ovum) secretes a chemical called fertilizin and sperm on its surface a protein called anti-fertilizin. 
    • The fertilizin of an egg interacts with the anti-fertilizin of the sperm of the same species. This interaction makes the sperms stick to the egg surface. 
    • The adhesion of sperm to the egg of the same species through chemical recognition is known as agglutination.
    • He showed that the sperm did not enter into the egg by simple mechanical boring. 
    • Instead, the presence of the sperm calls forth a reaction on the part of the egg that leads to the absorption of the former. 
    • Here, there is no copulation path where the male pronucleus will move on.
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    If you want to develop hybrid seeds within a bisexual flower, the following part needs to be removed from the same flower is
    Solution
    To develop hybrid seeds within a bisexual flower then anthers need to be removed from the same flower. The anther is the pollen-producing structure. If the anther is removed then the bisexual flower can not be pollinated with the anther of the same flower and can be pollinated with pollen of other flowers.
    So, the correct answer is option C.
  • Question 10
    1 / -0
    A student observed a plant with stellate hairs on vegetative parts and the fruit dehiscing into many seeded mericarps, which one of the following characters is also associated with that plant?
    Solution
    The plant which has stellate hairs on vegetative parts belongs to the section Eremophila..
    here, there is variation in flower shape, the most common being two petals at the top of the tube and three below, with the stamens enclosed in the tube. Species with this arrangement fail to self-pollinate and are generally insect pollinated.
    Thus, the correct answer is option (A). 
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