11. In which of the following part of the cell does the pyruvic acid is broken down into carbon dioxide, water and energy?
[A] Mitochondria
[B] Chloroplast
[C] Nucleus
[D] Cytoplasm
Show Answer
Correct Answer: A [Mitochondria]
Notes:
In Mitochondria, pyruvic acid is broken down into carbon dioxide, water and energy.
12. Which of the following does not hold true for Animal belonging to Phylum chordate?
[A] A post-anal part(tail) is present
[B] Notochord present
[C] Pharynx perforated by gill slits.
[D] Heart is dorsal(if present)
Show Answer
Correct Answer: D [Heart is dorsal(if present)]
Notes:
Chordata is a familiar phylum that includes organisms like mammals, fish, birds, reptiles, and amphibians (all vertebrates); sea squirts (tunicates); and lancelets (cephalochordates).
13. Match List I and List II and select the correct answer by using the codes given below the lists:
|
List I
|
List II
|
|
I. Malaria
|
(A) Bone marrow
|
|
II. Filaria
|
(B) Brain
|
|
III. Encephalitis
|
(C) Muscle
|
|
IV. Leukaemia
|
(D) Lymph node
|
|
|
(E) Blood cells
|
Codes: (UPSC Prelims 1997)
[A] I-E, II-C, III-B, IV-A
[B] I-E, II-D, III-B, IV-A
[C] I-D, II-C, III-E, IV-A
[D] I-E, II-D, III-A, IV-B
Show Answer
Correct Answer: B [I-E, II-D, III-B, IV-A]
Notes:
• Invasion by the malaria parasite, Plasmodium falciparum, brings about extensive changes in the host red cells. Numerous proteins secreted by the internalized parasite and interacting with red cell membrane proteins are responsible for the changes occurring to the host cell.
• Lymphatic filariasis is caused by the worms Wuchereria bancrofti, Brugia malayi, and Brugia timori. These worms occupy the lymphatic system, including the lymph nodes; in chronic cases these worms lead to the syndrome of elephantiasis. These worms occupy the subcutaneous layer of the skin, in the fat layer.
• Encephalitis is an acute inflammation of the brain usually resulting from either a viral infection or due to the body’s own immune system mistakenly attacking brain tissue.
• Leukaemia is a cancer that starts in blood-forming tissue, usually the bone marrow. It leads to the over-production of abnormal white blood cells, the part of the immune system which defends the body against infection.
14. Which of the following is not the Class of Biomolecules?
[A] Carbohydrate
[B] Proteins
[C] Catalyst
[D] Nucleic acids and Lipids
Show Answer
Correct Answer: C [Catalyst]
Notes:
Biomolecules are organic molecules, which are involved in the metabolic process of the living organism. The four important classes of biomolecules are carbohydrates, Proteins, Nucleic acids and Lipids.
15. Virus size is usually measured by__?
[A] centimeters
[B] micrometers
[C] nanometers
[D] millimeters
Show Answer
Correct Answer: C [nanometers]
Notes:
Virus size is usually measured by nanometers. Most viruses vary in diameter from 20 nanometers (nm; 0.0000008 in) to 250–400 nm. The largest viruses have a diameter of about 500 nm and a length of about 700–1,000 nm.
16. Which of the following statements regarding algae is incorrect.
[A] Most algae are photosynthetic
[B] Algae can be classified according to their pigments
[C] All algae are filamentous
[D] Spirogyra does not produce zoospores
Show Answer
Correct Answer: C [All algae are filamentous]
Notes:
Most algae are photosynthetic, Algae can be classified according to their pigments and Spirogyra does not produce zoospores.
17. Which of the following includes ‘club fungus’ in this fungal division?
[A] Zygomycota
[B] Deuteromycota
[C] Basidiomycota
[D] Ascomycota
Show Answer
Correct Answer: C [Basidiomycota]
Notes:
Basidiomycota is one of the two larger divisions. Together with the Ascomycota, they constitute the subfamily Dicarya within the kingdom Fungi.
18. Which of the following is not a characteristic of Bryophyta?
[A] Motile sperms
[B] Presence of archegonium
[C] Presence of archegonium
[D] Photosynthetically independent sporophyte
Show Answer
Correct Answer: D [Photosynthetically independent sporophyte]
Notes:
Motile sperms, the Presence of archegonium, and the Presence of archegonium are characteristics of Bryophyta.
19. What percentage of sunlight falls on the earth’s surface trapped by plants?
[A] 1%
[B] 2%
[C] 3%
[D] 4%
Show Answer
Correct Answer: A [1%]
Notes:
The green plants capture and absorb only 1% of the sunlight falling on the earth’s surface and use it for the process of photosynthesis. The Remaining 98-99% of sunlight is reflected by the atmosphere.
20. 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.
