1. Which of the following bacteria forms an endosymbiotic nitrogen fixing association with roots of legumes that helps in Nitrogen Fixation?
[A] Clostridium
[B] Rhizobium
[C] Salmonella
[D] Staphylococcus
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Correct Answer: B [Rhizobium]
Notes:
Rhizobium Found in roots of legumes, like Peas, grams, Pulses etc, where it fixes atmospheric nitrogen as ammonia, which is then converted into useful amino acid.
2. In Gymnosperms seeds are__________?
[A] Always naked
[B] Always covered
[C] Naked in some and covered in others
[D] Absent
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Correct Answer: A [Always naked]
Notes:
Gymnosperms are called so because they have naked ovules / seeds. In terms of plant evolution, they are first seed-bearing plants. They are inferior to Angiosperms because in Angiosperms, the ovules are covered.
3. Dengue which is found in tropical and subtropical regions around the world is a mosquito borne disease and caused by a _________?
[A] Bacteria
[B] Virus
[C] Fungi
[D] Protozoan
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Correct Answer: B [Virus]
Notes:
Dengue which is found in tropical and subtropical regions around the world is a mosquito borne disease and caused by a virus. Symptoms typically begin to appear three to fourteen days after infection.
4. Which among the following is essential for both activation and action of thrombin ?
[A] Na+
[B] Cl-
[C] Ca2+
[D] Mg2+
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Correct Answer: C [Ca2+]
Notes:
Thrombin is a naturally occurring enzyme that converts fibrinogen into fibrin, which is an integral step in clot formation. Ca2+ is essential for both activation and action of thrombin.
5. Which among the following group represents the most commonly found cancers in the world?
[A] Carcinoma
[B] Sarcoma
[C] Lymphoma
[D] Germ cell tumor
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Correct Answer: A [Carcinoma]
Notes:
Carcinoma group represents the most commonly found cancers in the world. Carcinoma is a cancer which begins in a tissue that lines the inner or outer surfaces of the body, and that arises from cells originating in the endodermal, mesodermal or ectodermal germ layer during embryogenesis.
6. Who among the following scientists is known for devising four criteria designed to establish a causal relationship between a causative microbe and a disease?
[A] Louis Pasteur
[B] Emil Behring
[C] Ivan Pavlov
[D] Robet Koch
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Correct Answer: D [Robet Koch]
Notes:
Dr. Robert Koch was a German (Prussian) physician. In 1877 he isolated Bacillus anthracis (causative agent of Anthrax) . He also isolated Tuberculosis bacillus (Causative agent of TB) and Vibrio cholera (causative agent of Cholera). He is also known to develop Koch’s postulates, the four criteria designed to establish a causal relationship between a causative microbe and a disease. He was awarded the Nobel Prize in Physiology or Medicine for his tuberculosis findings in 1905.
7. A tablet of which among the following Vitamins should be advised to be used after purification of water by Iodine as a disinfectant?
[A] Vitamin A
[B] Vitamin B
[C] Vitamin C
[D] Vitamin D
Show Answer
Correct Answer: C [Vitamin C]
Notes:
A tablet of Vitamin C should be advised to be used after purification of water by Iodine as a disinfectant. The addition of vitamin C usually in the form of a pill or in flavored drink powders, precipitates much of the iodine out of the solution.
8. In which of the following insects, a pigment called luciferin is found?
[A] Housefly
[B] Firefly
[C] Sandfly
[D] Fruitfly
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Correct Answer: B [Firefly]
Notes:
A pigment called luciferin is found in firefly. Luciferin is a light-emitting compound which is found in organisms that generate bioluminescence. Luciferins typically undergo an enzyme-catalyzed reaction with molecular oxygen.
9. What is epidermis made of?
[A] Dermatogen
[B] Periblem
[C] Protoderm
[D] Plerome
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Correct Answer: A [Dermatogen]
Notes:
Dermatogen is the outer primary meristem of a plant or plant part that according to the histogen theory gives rise to epidermis, which is the outermost layer of the skin. Epidermis provides barrier to infection from environmental pathogens.
10. Which among the following is also called as ‘power house of the cell’?
[A] Cell wall
[B] Mitochondria
[C] Golgi bodies
[D] Plastids
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Correct Answer: B [Mitochondria]
Notes:
Mitochondria is known as the Powerhouse of the Cell as it plays host to one of the most important processes in your body: cellular respiration. Taking in glucose and oxygen, mitochondria produce energy, which they capture and package as energy-rich molecules of ATP.