11. In which of the following plants, gametophyte is considered prothallus?
[A] Bryophyte
[B] Thallophyta
[C] Spermatophyte
[D] Pteridophyta
Show Answer
Correct Answer: D [Pteridophyta]
Notes:
Gametophyte is considered prothallus in Pteridophytes. Just as with seed plants and mosses, the life cycle of pteridophytes involves alternation of generations. This means that a diploid generation of the sporophyte, which produces spores is followed by a haploid generation i.e. the gametophyte or prothallus, which produces gametes.
12. What is the scientific name of human beings?
[A] Melongena sapiens
[B] Tigris solanum
[C] Homo sigrum
[D] Homo sapiens
Show Answer
Correct Answer: D [Homo sapiens]
Notes:
In taxonomy, Homo sapiens is the only extant human species. The name is Latin for “wise man” and was introduced in 1758 by Carl Linnaeus. Humans are the only extant members of the subtribe Hominina.
13. Which of the following is not immunized by the Triple Antigen? (UPSC Prelims 1984)
[A] Diphtheria
[B] Tetanus
[C] Typhoid
[D] Whooping cough
Show Answer
Correct Answer: C [Typhoid]
Notes:
Triple antigen is a combined vaccine against diphtheria, tetanus, and pertussis (whooping cough), in which the pertussis component is acellular. This is in contrast to whole-cell, inactivated DTP. The acellular vaccine uses selected antigens of the pertussis pathogen to induce immunity.
14. Which organelle in the cell, other than nucleus, contains DNA? (UPSC Prelims 2001)
[A] Centriole
[B] Golgi apparatus
[C] Lysosome
[D] Mitochondrion
Show Answer
Correct Answer: D [Mitochondrion]
Notes:
Mitochondrion is the organelle in the cell, other than nucleus that contains DNA. Mitochondria are the working organelles that keep the cell full of energy. Mitochondria are small organelles floating free throughout the cell. Some cells have several thousand mitochondria while others have none. Muscle cells need a lot of energy so they have loads of mitochondria.
15. Which pigment is responsible for the colour of healthy skin in human beings?
[A] Bilirubin
[B] Haemoglobin
[C] Melanin
[D] Progesterone
Show Answer
Correct Answer: C [Melanin]
Notes:
The single most factor responsible for the cpolour of the skin is the pigment melanin. It is secreted by the melanocytes within the skin.
16. In photosynthesis, light energy is converted into which form of energy?
[A] Electrical energy
[B] Kinetic energy
[C] Chemical energy
[D] Potential energy
Show Answer
Correct Answer: C [Chemical energy]
Notes:
In the process of photosynthesis, the energy from solar light is converted into the chemical energy.
17. To which of the following kingdoms does the yeast belong to?
[A] Bacteria
[B] Virus
[C] Fungus
[D] None of the above.
Show Answer
Correct Answer: C [Fungus]
Notes:
Yeast is an unicellular eukaryotic micro organism belonging to the family of fungus.
18. Which is the world’s smallest bird?
[A] Red-cheeked Cordon-Bleu
[B] Costa’s Hummingbird
[C] Bee Hummingbird
[D] Goldcrest
Show Answer
Correct Answer: C [Bee Hummingbird]
Notes:
Bee Hummingbird is the smallest bird in the world. It is only 2 to 2.4 inches long and weighs 0.056 to 0.071 ounces. This bird is also known as zunzuncito or Helena Hummingbird. This bird is native to Cuba. It is endemic to the entire Cuban archipelago. It is “Nearly Threatened” bird species according to IUCN Red List of Threatened Species.
19. What does B denote in the term RBCs ?
[A] Build
[B] Blood
[C] Bloody
[D] Building
Show Answer
Correct Answer: B [Blood]
Notes:
The term RBC stands for Red Blood Cells (RBCs) which performs the function of transferring oxygen to other tissues of the body. The RBCs are also known as Red Blood Corpuscles.
20. Which cell organelle controls the entry and exit of molecules into and out of the cell?
[A] Golgi bodies
[B] Cell membrane
[C] Lysosomes
[D] Mitochondria
Show Answer
Correct Answer: B [Cell membrane]
Notes:
A plasma membrane is made up of lipids and proteins. The composition can fluctuate depending on the fluidity in the plasma membrane, the external environment, and the different stages of cell development.
