11. In eye donation, which one of the following parts of donor’s eye is utilized? (UPSC Prelims 1999)
[A] Iris
[B] Lens
[C] Cornea
[D] Retina
Show Answer
Correct Answer: C [Cornea]
Notes:
Generally blindness is caused by the dryness and hardness of cornea. Cornea is a clear layer which helps passing of light. It is an outer layer and can be transfer from one person to another.
12. Which among the following is NOT a major function of the plant hormone Abscisic Acid?
[A] Abscission of Leaves
[B] Inhibition of growth and maintenance of the dormancy of buds
[C] Inhibition of germination in dormant seeds
[D] All of them are major functions of Abscisic Acid
All of above are major functions of Abscisic acid
Show Answer
Correct Answer: A [Abscission of Leaves]
Notes:
This question is might have trapped almost all of you. The option A which etymologically linked to the question would trap you. We should note that Abscisic acid plays any significant role in leaf abscission is unfortunately not proved. The hormone is also called Dormin and its major functions are inhibition. But abscission of leaves is something better explained by Auxin-ethylene roles. Kindly surf the web and try to find out, if I am right. Inhibition of growth and maintenance of the dormancy of buds are the most striking effects of ABA. ABA activity alone is not enough to keep the dormancy of buds up in the long term though. Further, ABA is an efficient inhibitor of germination and occurs in high concentrations in dormant seeds. The role ABA has during the abscission of fruits and leaves is largely unknown. Though both cases seem to be governed by similar mechanisms (Auxin-Ethylene to a great extent) has ABA nearly no effect on the abscission of leaves while it shows a clear effect on fruit abscission. The role of Abscisic acid in abscission was a pharmacological artifact…applied AbA often induces ethylene biosynthesis.
13. Which modern concept was pioneered by Rudolf Virchow?
[A] pathological processes
[B] process of fermentation
[C] isotopes as tracers to study chemical and biological processes
[D] None of these
Show Answer
Correct Answer: A [pathological processes]
Notes:
Rudolf Virchow was a German pathologist and politician who pioneered the modern concept of disease processes by his application of cell theory to explain the effects of disease in body organs and tissues.
14. Which of the following was defined by Gerardus Johannes Mulder?
[A] Vitamins
[B] Protiens
[C] Fats
[D] None of these
Show Answer
Correct Answer: B [Protiens]
Notes:
The protein was first described by Dutch chemist Gerardus Johannes Mulder and named by Swedish chemist Jöns Jacob Berzelius in 1838.
15. The Six Kingdoms of Classification is also known as the latest classification system. By whom is it given?
[A] C Woese
[B] O Kandler
[C] Mc Wheels.
[D] Ernest Haeckel
Show Answer
Correct Answer: A [C Woese]
Notes:
In biology, a scheme of classifying organisms into six kingdoms: Proposed by Carl Woese et al: Animalia, Plantae, Fungi, Protista, Archaea/Archaeabacteria, and Bacteria/Eubacteria.
16. Microfilaments are made up of which protein?
[A] Tubulin
[B] Actin
[C] Myosin
[D] Chitin
Show Answer
Correct Answer: B [Actin]
Notes:
Microfilaments are composed of globular subunits of the protein actin. Actin monomers polymerize in the presence of ATP to form flexible helical filaments.
17. Who among the following discovered the cytoplasm?
[A] Rudolf von Kölliker
[B] Camillo Golgi
[C] Christian de Duve
[D] Walther Flemming
Show Answer
Correct Answer: A [Rudolf von Kölliker]
Notes:
The term was introduced by Rudolf von Kölliker in 1863. It was originally synonymous with protoplasm, but later changed to mean cell matter and organelles outside the nucleus.
18. In pteridophytes, which of the following is the dominant generation?
[A] gametophytic
[B] haploid
[C] diploid
[D] triploid
Show Answer
Correct Answer: C [diploid]
Notes:
In pteridophytes, the dominant is the diploid sporophytic generation because it develops from the diploid zygote.
19. Plants are the only organisms that can prepare food for themselves by using which of the following substances?
[A] water
[B] carbon dioxide
[C] minerals
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Plants are the only organisms that can prepare food for themselves by using water, carbon dioxide and minerals. The raw materials are present in their surroundings.
20. Which of the following is not a function of Ethylene?
[A] stimulates the conversion of starch and acids to sugars
[B] promotes germination in some cereals
[C] stimulate shoot elongation, seed germination
[D] fruit ripening, flower wilting, and leaf fall
Show Answer
Correct Answer: C [stimulate shoot elongation, seed germination]
Notes:
The function of Ethylene – stimulates the conversion of starch and acids to sugars, promotes germination in some cereals, and sprouting of bulbs and potatoes and is also associated with fruit ripening, flower wilting, and leaf fall.
