11. The Indian Pipe Plant or Monotrapa can be best placed in which among the following groups?
[A] Parasite
[B] Saprophyte
[C] Insectivorous
[D] Lithophyte
Show Answer
Correct Answer: B [Saprophyte]
Notes:
Pipe Plant is a total saprophyte i.e. thrives on dead or decayed organic matter
12. Which of the following is the correct statement about heterotrophs?
[A] They obtain their energy from sunlight, harnessed by pigments
[B] They obtain their energy by oxidizing organic molecules
[C] They make organic molecules from CO2
[D] They obtain their energy by consuming exclusively autotrophs
Show Answer
Correct Answer: B [They obtain their energy by oxidizing organic molecules]
Notes:
A heterotroph obtains its energy from organic molecules. An autotroph obtains energy from sunlight utilizing pigments including chlorophyll (A) and uses CO2 and water to make organic molecules. heterotrophs can obtain their energy from ingesting autotrophs, but can also consume other heterotrophs.
13. Which among the following are found in all viruses?
[A] DNA and proteins
[B] Nucleic acid and capsid
[C] DNA and cell membrane
[D] RNA and cell wall
Show Answer
Correct Answer: B [ Nucleic acid and capsid]
Notes:
Viruses are made up of nucleic acid (either DNA or RNA; but not both) surrounded by a protein coat called a capsid. They do not contain a cell wall, proteins, or cell membrane
14. Which solution makes a cell turgid?
[A] Hypotonic solution
[B] Isotonic solution
[C] Hypertonic solution
[D] None of the above
Show Answer
Correct Answer: A [Hypotonic solution]
Notes:
When the plant cell is placed in a hypotonic solution, it takes up water by osmosis and starts to swell, but the cell wall prevents it from bursting. The plant cell is said to have become “turgid” i.e. swollen and hard.
15. How many types of tissues are present in the body of all complex animals?
[A] 400
[B] 4000
[C] 40
[D] 4
Show Answer
Correct Answer: D [4]
Notes:
In biology, tissue is a cellular organizational level between cells and a complete organ. Animal tissues are grouped into four basic types: connective, muscle, nervous, and epithelial.
16. What is caused by the deficiency of Vitamin D? (UPSC Prelims 1980).
[A] Rickets
[B] Night blindness
[C] Pellagra
[D] Scurvy
Show Answer
Correct Answer: A [Rickets]
Notes:
Rickets is a skeletal disorder that’s caused by a lack of vitamin D, calcium, or phosphate. These nutrients are important for the development of strong, healthy bones. People with rickets may have weak and soft bones, stunted growth, and, in severe cases, skeletal deformities.
17. The messages received by and transmitted from the brain to the various parts of the body take the form of which of the following impulses? (UPSC Prelims 1983)
[A] Nervous impulses
[B] Chemical impulses
[C] Mechanical impulses
[D] Automatic impulses
Show Answer
Correct Answer: A [Nervous impulses]
Notes:
The message to the brain form any body part takes the form of nervous impulses. Nerve impulses are mostly electrical signals along the dendrites to produce a nerve impulse or action potential. The action potential is the result of ions moving in and out of the cell.
18. Which vitamin deficiency leads to Scurvy?
[A] Vitamin B3
[B] Vitamin C
[C] Vitamin K
[D] Vitamin B9
Show Answer
Correct Answer: B [Vitamin C]
Notes:
Vitamin C deficiency leads to scurvy. Symptoms of scurvy include gum bleeding, loose teeth, bulge in eyes.
19. Which is the largest organ in the human body?
[A] Liver
[B] Large intestine
[C] Skin
[D] Pancreas
Show Answer
Correct Answer: C [Skin]
Notes:
Skin is considered as the largest organ in the human body as a whole while liver is the largest internal organ of the human body.
20. Which branch of biology is deal with the study of seeds?
[A] Embryology
[B] Spermatology
[C] Gerontology
[D] Histology
Show Answer
Correct Answer: B [Spermatology]
Notes:
The study of seeds is known as spermatology. It involves the study in terms of morphology, characteristics and interactions with the environment.
