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Mix Test - 9

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Weekly Quiz Competition
  • Question 1
    1 / -0
    Dark-coloured peppered moth is able to survive in industrial areas because of
    Solution
    Dark-coloured peppered moth is able to survive in industrial areas because of natural selection.Natural selection is a process where organisms that are better adapted to an environment will survive and have more offspring. During the nineteenth century, pollution killed off some of the lichens and soot deposits caused the bark on trees to appear darker. Light coloured moths were no longer camouflaged and were eaten by birds. The dark moths had a better camouflage.As a result, dark moths had a greater chance of reproducing and passing on the phenotypes that made them dark. This led to a gradual increase in the proportion of dark moths until light moths became very rare in industrial areas.
  • Question 2
    1 / -0
    In which of the following groups does a larval stage occur in the life history of all members of the group?
    Solution
    Animal Larval Stage
    Butterfly Caterpillar
    Frog Tadpole
    Mosquitoes Wriggler
    Housefly Maggot
  • Question 3
    1 / -0
    Which of the following pigments is responsible for the red colour of red algae?
    Solution
    The red colour of red algae results from the pigments phycoerythrin and phycocyanin. These colours mask the other pigments like chlorophyll a, chlorophyll b, beta-carotene and xanthophylls.
  • Question 4
    1 / -0
    If a segment of a chromosome is broken and attached to the same chromosome upside down with no loss or gain of genes, then the aberration will be termed as
    Solution
    During inversion, the piece of the chromosome flips around and is reattached to the rest of the chromosome, but upside down. Unless the genes need to be regulated by other genes via direct contact, inversions are not as serious and often keep the chromosome working properly. If there is no effect on the species, the inversion is considered a silent mutation.
  • Question 5
    1 / -0
    In which of the following crosses will the progenies obtained be fifty percent homozygous recessive and fifty percent heterozygous dominant?
    Solution
    In a cross between Tt and tt, the progenies obtained will be fifty percent homozygous recessive (tt) and fifty percent heterozygous dominant (Tt).

  • Question 6
    1 / -0
    The closure of lid of pitcher in a pitcher plant is due to
    Solution
    Nepenthes (pitcher plant) is an insectivorous plant. The leaf lamina is modified to form a pitcher and leaf apex forms a coloured lid. When the insect enter the pitcher, it is an external stimuli, so the closure of the lid is paratonic movement.
  • Question 7
    1 / -0
    After ovulation, the collapsed ovarian follicle shrinks and becomes
    Solution
    Corpous luteum is a hormone-secreting structure that develops in an ovary after an ovum has been discharged, but degenerates after a few days unless pregnancy has begun. It functions as an endocrine organ (produces progesterone and estrogens) supporting pregnancy and preventing menstruation . It is formed during the luteal phase of the menstrual cycle by proliferation and differentiation of both the follicular granulosa cells and thecal cells that together interact to produce progesterone and estrogens. Ovarian luteal cells have an important role in progesterone production.
  • Question 8
    1 / -0
    A tall couple has a dwarf child. The trait of tallness (T) is dominant over dwarfness (t). Which of the following is the genotype of the couple?
  • Question 9
    1 / -0
    Crossing over takes place at a stage between
    Solution
    Crossing over takes place at a stage between zygotene and diplotene. Crossing over is the exchange of genes between two chromosomes, resulting in non-identical chromatids that comprise the genetic material of gametes (sperm and eggs).
  • Question 10
    1 / -0
    Which of the following proteins is present in the bone matrix?
    Solution
    The mineralised matrix of bone tissue has an organic component of mainly collagen, called ossein, and an inorganic component of bone mineral made up of various salts.
  • Question 11
    1 / -0
    If the father is a haemophilic and the mother is a carrier, then what are the chances of their son being haemophilic?
    Solution
    In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition.
    A man who has hemophilia and a woman who is a carrier have:
    • a 25% (one in four) chance of having a son with hemophilia
    • a 25% chance of having a son with normal blood clotting
    • a 25% chance of having a daughter who is a carrier
    • a 25% chance of having a daughter who has hemophilia

  • Question 12
    1 / -0
    Pernicious anaemia is due to the deficiency of which vitamin?
    Solution
    Cyanocobalamin is also known as Vitamin B12. Pernicious anaemia is defined as a type of Vitamin B12 deficiency that results from impaired uptake of Vitamin B12 due to the lack of intrinsic factor (IF). The most common cause of pernicious anemia is the loss of stomach cells that make intrinsic factor. Intrinsic factor helps body absorb Vitamin B12 in intestine.
  • Question 13
    1 / -0
    The water-soluble pigment present in vacuoles is
    Solution
    Many plant cells synthesize water-soluble pigments, such as anthocyanins and betalains, which are localized in the vacuole. Plants produce anthocyanins as a protective mechanism against environmental stressors, such as ultraviolet light, cold temperatures and drought. This production of anthocyanins in roots, stems and especially leaf tissues is believed to provide resistance against these environmental hazards.
  • Question 14
    1 / -0
    Match list I with list II.

    List I List II
    I. ABA 1. Germination promoter
    II. Kinetin 2. Dormancy breaker
    III. Chloroethanol 3. Germination inhibitor
    IV. Gibberellin 4. Induction of sprouting in potato tuber
    Solution
    The growth regulator kinetin promotes the gemination of seeds.Abscisic acid is responsible for seed dormancy by inhibiting cell growth.
    Chloroethanol helps to break the seed dormancy.Gibberellin induces flowering and sprouting.
  • Question 15
    1 / -0
    Which of the following pairs is not correctly matched?
    Solution
    Arteriosclerosis is the stiffening or hardening of the artery walls. This restricts the blood flow to the tissues and organs. The most common causes include smoking and high blood pressure.
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