General Science - Biology MCQs
61. Which of the following elements are found in DNA?
- Oxygen
- Nitrogen
- Sulphur
- Phosphorus
- Carbon
Select the correct option from the codes given below:
[A] Only 1, 2, 3 & 5
[B] Only 1, 2, 4 & 5
[C] Only 1, 2 & 5
[D] 1, 2, 3, 4 & 5
Show Answer
Correct Answer: B [ Only 1, 2, 4 & 5]
Notes:
This question is based on difference between DNA and Proteins. DNA does not contain sulfur; proteins do. DNA consists of thesugar deoxyribose, which contains carbon, hydrogen, and oxygen. DNA also contains phosphates, which contain phosphorous and oxygen. DNA also contains nitrogenous bases, which contain nitrogen. This difference in composition between DNA and proteins was the basis of the experiment done by Hershey and Chase.
62. Anemia is one of the major health problems in the adolescent boys and girls in our country. Which among the following can effectively cause anaemia?
- Low intake of Iron
- Low intake of citric acid
- Infestation of Worms
- Malaria
Select the correct option from the codes given below:
[A] Only 1 & 2
[B] Only 1 & 4
[C] Only 1
[D] 1, 2, 3 & 4
Show Answer
Correct Answer: D [ 1, 2, 3 & 4]
Notes:
Anaemia means reduced haemoglobin levels in the blood. Anemia can be nutritional as well as non-nutritional or genetic. The most common cause of anaemia is low intake of iron and folic acid in our diet. Deficiency of other nutritional elements such as vitamin C (Citric Acid) and Vitamin B12 can also cause anaemia. Non- Nutritional-Conditions such as hookworm infestation and malaria can also lead to anaemia.
63. ‘Mosquitoes breed on stagnant water and their larvae keep floating on water’.When oil is sprinkled on the stagnant water, it results in the drowning and death of the larvae.Which of the following is the reason behind death of larvae?
[A] Sprinkling of oil in water reduces surface tension of water
[B] Sprinkling of oil in water increase surface tension of water
[C] Sprinkling of oil in water increases viscocity of water
[D] Sprinkling of oil in water cut of oxygen supply to larvae.
Show Answer
Correct Answer: A [ Sprinkling of oil in water reduces surface tension of water]
Notes:
The property of the surface of the liquid to behave like an elastic membrane is called surface tension.The surface of a liquid resist an external force, due to the cohesive nature of its molecules.When oil is Sprinkled in water, it reduces surface tension of water, resulting in the drowning and death of the larvae.
64. Which among the following plant is likely to show a greater water use efficiency?
[A] Wheat
[B] Rice
[C] Sorghum
[D] Pea
Show Answer
Correct Answer: C [ Sorghum]
Notes:
The reason is that Sorghum is a C4 plant.
65. Which of the following is present in prokaryotic as well as eukaryotic cells?
[A] Mitochondria
[B] Golgi Bodies
[C] Lysosomes
[D] Ribosomes
Show Answer
Correct Answer: D [ Ribosomes]
Notes:
Mitochondria, Chloroplasts, Golgi Bodies, Lysosomes, Endoplasmic reticulum and Peroxisomes are absent in prokaryotic cells. Ribosomes are smaller in prokaryotic cells and larger in eukaryotic cells.
66. Ribosomes contain:
- DNA
- RNA
- Protein
Select the correct option from codes given below:
[A] 1 & 2 Only
[B] 2 Only
[C] 2 & 3 Only
[D] 1, 2 & 3
Show Answer
Correct Answer: C [ 2 & 3 Only]
Notes:
Ribosomes do not contain DNA. They contain RNA and Protein. DNA is found within the nucleus, mitochondria and chloroplasts.
67. Consider the following pairs:
- Widal test – Typhoid
- Rapid sputum test – Swine flu
- Blood smear – Malaria
Which of the above is/are correct?
[A] 1 & 2 Only
[B] 2 Only
[C] 1 & 3 Only
[D] 1, 2 & 3
Show Answer
Correct Answer: C [ 1 & 3 Only]
Notes:
Rapid sputum tests are used to diagnose tuberculosis (TB) when other tests show that a person probably has TB. Positive IgM and IgG tests for dengue antibodies detected in an initial blood sample mean that it is likely that the person became infected with dengue virus within recent weeks. Doctors use thick and thin blood smears to determine whether one has malaria.
68. Which of the following statements are correct about ringworm infection?
- Ringworm infection can affect both humans and animals
- This infection is caused by a worm
- Ringworm is contagious and can be passed from person to person
Select the correct option from codes given below:
[A] 1 & 3 Only
[B] 2 Only
[C] 2 & 3 Only
[D] 1, 2 & 3
Show Answer
Correct Answer: A [ 1 & 3 Only]
Notes:
Ringworm infection isn’t caused by a worm. Ringworm is a fungal infection of the skin.
69. Consider the following differences between bacteria and virus:
- While ribosomes are present in bacteria, they are absent in virus
- While nucleus is present in bacteria, it is absent in virus
Which of the above statements is/are correct?
[A] 1 Only
[B] 2 Only
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [ Both 1 & 2]
Notes:
A virus is a small infectious agent that replicates only inside the living cells of other organisms. Bacteria constitute a large domain of prokaryotic microorganisms. While bacteria are unicellular, viruses have no cells.
70. Consider the following vitamins:
- Vitamin A
- Vitamin B
- Vitamin C
- Vitamin D
Which of the above are fat soluble?
[A] 1 & 4 Only
[B] 1, 2 & 4 Only
[C] 3 & 4 Only
[D] 1, 2, 3 & 4
Show Answer
Correct Answer: A [ 1 & 4 Only]
Notes:
Fat soluble vitamins are: vitamin A, vitamin D, vitamin E and vitamin K
Water soluble vitamins are: vitamin B and vitamin C
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