General Science - Biology MCQs
41. The radiations used in Radiotherapy for the treatment of Cancer destroys the Cancer tumour mainly by which among the following?
[A] Destroying the Cytoplasm of the Cancerous Cells
[B] Destroying the Cell membranes of the Cancerous Cells
[C] Destroying the DNA of the Cancerous Cells
[D] Destroying the spindle fibres which are used in Cell Division
Show Answer
Correct Answer: C [ Destroying the DNA of the Cancerous Cells]
Notes:
The radiations used in Radiotherapy for the treatment of Cancer destroys the Cancer tumour mainly by Destroying the DNA of the Cancerous Cells. It uses high doses of radiation to kill cancer cells and shrink tumors.
42. Seeds__:
1. always contain cotyledon
2. are not found in conifers, bryophytes and ferns
3. contain the gametophyte
Which among the above is / are correct?
[A] Only 1
[B] Only 2 & 3
[C] Only 1 & 2
[D] 1, 2 & 3
Show Answer
Correct Answer: A [ Only 1]
Notes:
Seeds contain the embryo (and not gametophyte) and the food for the embryo, the endosperm (in monocots) or thecotyledon (in dicots). All plants do not produce seeds; for example, bryophytes and the ferns do not. Conifers do produce seeds. They are located on cones.
43. Consider the following:
Assertion: Sugarcane plant is capable of Nitrogen Fixation
Reason: The roots of Sugarcane plants are home to a variety of Nitrogen fixation bacteria
Which among the above statements is / are correct?
[A] Assertion is correct, Reason is incorrect
[B] Assertion is incorrect, Reason is correct
[C] Both Assertion and Reason are correct
[D] Both Assertion and Reason are incorrect
Show Answer
Correct Answer: A [ Assertion is correct, Reason is incorrect]
Notes:
The first statement is correct because some sugarcane varieties are known to be capable of fixing atmospheric nitrogen in association with a bacterium called Glucoacetobacter diazotrophicus. But, second statement is incorrect because, in contrary to legumes and other nitrogen fixing plants which form root nodules in the soil in association with bacteria, G. diazotrophicus lives within the intercellular spaces of the sugarcane’s stem. Please note that if you are given some options such as Potato, Wheat, Barley and Sugarcane and asked which of them would requires maximum amount of N, the answer would be Sugarcane.
44. Consider the following:
1. Red Snow
2. Red Rust (of tea)
3. Red Tide Which among the above is / are caused by algae?
[A] Only 1 & 2
[B] Only 1
[C] Only 3
[D] 1, 2 & 3
Show Answer
Correct Answer: D [ 1, 2 & 3]
Notes:
Red snow’ is caused by an alga called Chlamydomonas nivalis. Red tide is a common name for a phenomenon known as an algal bloom (large concentrations of aquatic microorganisms) when it is caused by a few species of dinoflagellates and the bloom takes on a red or brown color. Another alga Cepheleuros virescence parasitizes tea plants and produces the disease “red rust.” One more option Red Sea could also be added to this question. That part of the Mediterranian sea in which the blue-green alga Trichodesmium grows profusely is called the ‘Red sea’, It is due to the presence of red phycoerythrin in the cells of Trichodesmium.
45. The Pentavalent vaccine protects against:
1. both Hepatitis B and Rubella
2. both bacterial and Viral diseases
Which among the above is / are correct statements?
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [ Both 1 & 2]
Notes:
Pentavalent Vaccine is a vaccine that contains five antigens (diphtheria, pertussis, tetanus, and hepatitis B and Haemophilus influenzae type b). It helps in curing both bacterial and viral diseases like Hepatitis B and Rubella.
46. The plant hormone that plays important role in establishing dormancy in seeds is __?
[A] Ethylene
[B] Gibberlic acid
[C] Abcisic Acid
[D] Auxin
Show Answer
Correct Answer: C [ Abcisic Acid]
Notes:
Seeds are not only important agents of reproduction and dispersal, but they are also essential to the survival of annual and biennial plants. These angiosperms die after flowering and seed formation is complete. ABA is essential for seed maturation and also enforces a period of seed dormancy. As it is important the seeds not germinate prematurely during unseasonably mild conditions prior to the onset of winter or a dry season. ABA in the seed enforces this dormancy. Not until the seed has been exposed to a prolonged cold spell and/or sufficient water to support germination is dormancy lifted.
47. Xerophytes can tolerate and stand against _?
[A] High temperature
[B] Severe Cold
[C] High humidity
[D] Drought Conditions
Show Answer
Correct Answer: D [ Drought Conditions]
Notes:
Xerophytes can tolerate and stand against drought conditions. They are able to survive in an environment with little liquid water, such as a desert or an ice- or snow-covered region in the Alps or the Arctic.
48. Which of the following is are correct statements?
- Bats, Dogs as well as Dolphins can perceive the frequency range of more than 20,000 Hz
- Bats detect the obstacles in their path by receiving the reflected infrasonic waves
Select the correct option from the codes given below:
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: A [ Only 1]
Notes:
Human audible range is from 12-16 Hz to 20000 Hz. In Dogs, it is within the range of approximately 40 Hz to 60,000 Hz. The Dog whistles are blown at around 22-25000 Hz, which seem silent to us but can bring a dog in action, thus used in their training. Bats use the concept of echolocation and their frequency range is between 20 Hz and 120,000 Hz. Dolphins range anything between 0.25 to 150 kHz. The second statement is not correct because Bats detect the obstacles in their path by receiving the reflected ultrasonic waves.
49. Identify the organelle with the help of given information:
- It is a double membrane organelle.
- It is found only in eukaryotic cells.
- It is responsible for ATP production.
Select the correct option from codes given below:
[A] Centriole
[B] Lysosome
[C] Endoplasmic Reticulum
[D] Mitochondria
Show Answer
Correct Answer: D [ Mitochondria]
Notes:
Mitochondria is the correct answer.
50. Zika virus can be transmitted to humans through:
- Mosquito
- Goat
- Duck
- Bat
Select the correct option from codes given below:
[A] Only 1
[B] Only 1 & 4
[C] Only 1, 3 & 4
[D] 1, 2, 3 & 4
Show Answer
Correct Answer: A [ Only 1]
Notes:
Zika virus is transmitted to people primarily through the bite of an infected Aedes species mosquito. But there is still no evidence that Zika virus can be spread to humans through Goat, Duck, Bat or other animals.
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