General Science - Biology MCQs
11. Poliomyelitis known as Polio is caused by an enterovirus which causes paralysis of muscles. This virus has a particular affinity to ______?
[A] Muscle Cells
[B] Nerve Cells of Spinal Cord
[C] Nerve Cells of Brain
[D] None of the above
Show Answer
Correct Answer: B [Nerve Cells of Spinal Cord]
Notes:
Acute poliomyelitis is disease of anterior horn motor neurons of the spinal cord and brain stem caused by poliovirus. The virus infects and kills motor neurons in the grey matter in the ventral horn of the spinal column. Due to this, muscles of the trunk and limbs are no longer able to receive signals from the CNS, so they become weak and begin to atrophy.
12. A ripe Tomato is Red, Leaves are Green, Flower is Purple, Hair is Black. Bring out the pigments responsible for these colors respectively ?
[A] Lycopene, Melanin, Chlorophyll, Anthocyanin
[B] Lycopene, Chlorophyll, Anthocyanin, Melanin
[C] Anthocyanin, Chlorophyll, Lycopene, Melanin
[D] Melanin, Anthocyanin, Chlorophyll, Lycopene
Show Answer
Correct Answer: B [Lycopene, Chlorophyll, Anthocyanin, Melanin]
Notes:
A ripe Tomato is Red, Leaves are Green, Flower is Purple, Hair is Black. The pigments responsible for these colors are Lycopene, Chlorophyll, Anthocyanin, Melanin respectively.
13. Which among the following is a main structural axes of a vascular plant?
[A] Thallus
[B] Leaves
[C] Stem
[D] Flower
Show Answer
Correct Answer: C [Stem]
Notes:
Stem is a main structural axes of a vascular plant. The stem transports water, minerals, and food to other parts of the plant; it may also store food, and green stems themselves produce food.
14. Onion, daffodil, tulip are which kind of stems?
[A] Bud
[B] Bulb
[C] Cladophyll
[D] None of the above
Show Answer
Correct Answer: B [Bulb]
Notes:
Onion, daffodil, tulip are bulb stems. The best example of a true bulb is the onion. The rings which we see when we slice an onion in half are actually leaves modified to hold food for the bulb when it is dormant.
15. Prophase, metaphase, anaphase & telophase are the stages of which of the following process?
[A] Mitosis / Meiosis
[B] Asexual reproduction
[C] sexual reproduction
[D] Cell metabolism
Show Answer
Correct Answer: A [Mitosis / Meiosis]
Notes:
Mitosis is a fundamental process for life. During mitosis, a cell splits to form two identical daughter cells by duplicating all of its contents, including its chromosomes. Prophase, metaphase, anaphase & telophase are the stages of
Mitosis.
16. Kwashiorkor disease is caused by the deficiency of which of the following ?
[A] Vitamins
[B] Proteins
[C] Fats
[D] Minerals
Show Answer
Correct Answer: B [Proteins]
Notes:
Kwashiorkor disease is caused by the deficiency of proteins. It is also known as “edematous malnutrition”. It is a nutritional disorder most often observed in regions experiencing famine.
17. Diseases of which among the following are included in degenerative diseases?
[A] Heart, Joints, Nervous system
[B] Heart, Joints,
[C] Joints only
[D] Hear only
Show Answer
Correct Answer: A [Heart, Joints, Nervous system]
Notes:
Diseases of heart, joints and nervous system are included in degenerative diseases. They are a result of a continuous process based on degenerative cell changes, affecting tissues or organs, which will increasingly deteriorate over time.
18. Which among the following is / are correct regarding a mature sperm and ovum?
[A] They both are of approximately same size
[B] They both have equal number of Chromosomes
[C] They both contain flagella
[D] None of the above
Show Answer
Correct Answer: B [They both have equal number of Chromosomes]
Notes:
The number of chromosomes is reduced from 46 (23 pairs) to 23 during the process of meiosis. In a human egg or sperm, there are 23 chromosomes, one of which is an X or Y. A human egg is haploid (has 23 chromosomes) and a sperm is haploid (has 23 chromosomes).
19. The cultivation of which of the plants on wastelands has a potential to generate biofuel in large quantities?
[A] Jatropha curcas
[B] Copaifera langsdorffii
[C] Camelina sativa
[D] None of the above
Show Answer
Correct Answer: A [Jatropha curcas]
Notes:
The cultivation of Jatropha curcas on wastelands has a potential to generate biofuel in large quantities. It is a species of flowering plant in the spurge family called Euphorbiaceae, that is native to the American tropics, most likely in Mexico and Central America.
20. Which among the following contributes to the replenishment of soil?
[A] Bacteria
[B] Fungi
[C] Algae
[D] Earthworm
Show Answer
Correct Answer: D [Earthworm]
Notes:
Earthworm contributes to the replenishment of soil. As the earthworm moves through the soil, it creates burrows. This allows air and water to move more readily through the soil. The worms also feed on the decaying organic matter, which helps to improve soil fertility.
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