11. Which of the following gave green colour to plants? (UPSC Prelims 1980).
[A] Chlorophyll
[B] Sugar
[C] Mitochondria
[D] Xylem
Show Answer
Correct Answer: A [Chlorophyll]
Notes:
Chlorophyll is the primary pigment in plants. It absorbs yellow and blue wavelengths of light while reflecting green. It is the presence and relative abundance of chlorophyll that gives plants their green color.
12. Which of the following represent Dinosaurs? (UPSC Prelims 1989)
[A] A reptile
[B] An amphibian
[C] A mammal
[D] A bird
Show Answer
Correct Answer: A [A reptile]
Notes:
Dinosaurs were warm-blooded reptiles. Mammal bone study sheds light on dinosaur physiology.
13. 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.
14. Pollination by which among the following is called as ornithophily?
[A] Rodents
[B] Aquatic animals
[C] Ants
[D] Birds
Show Answer
Correct Answer: D [Birds]
Notes:
Ornithophily refers to the pollination assisted by the birds. Ornithology is a branch of science which studies about birds. Dr. Salim Ali is a famous Indian ornithologist.
15. Which branch of biology is deal with the study of seeds?
[A] Embryology
[B] Spermatology
[C] Gerontology
[D] Histology
Show Answer
Correct Answer: B [Spermatology]
Notes:
The study of seeds is known as spermatology. It involves the study in terms of morphology, characteristics and interactions with the environment.
16. Which of the following vitamins was crystallized by Harry Holmes and Ruth Corbet?
[A] Vitamin A
[B] Vitamin B
[C] Vitamin C
[D] Vitamin E
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Harry Holmes and Ruth Corbet isolated and crystallized vitamin A in 1937. Vitamin A is important for normal vision, the immune system, and reproduction.
17. Who proposed the model for protein synthesis?
[A] Ostwald Avery
[B] Mclyn McCarthy
[C] Colin Macleod
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Ostwald Avery, McLean McCarthy and Colin MacLeod proposed a model for the process of protein synthesis with the help of DNA in bacterial cells. Cell growth, synthesis of DNA, synapsis and synthesis of proteins.
18. Which of the following viruses can rescue adenovirus in simian cells?
[A] Rabies
[B] Vaccinia
[C] Simian virus 40
[D] Cytomegalovirus
Show Answer
Correct Answer: C [Simian virus 40]
Notes:
Simian virus 40 (SV40) has been one of the most intensively studied animal viruses. Simian virus 40 has been used as a model eukaryotic promoter for the study of DNA sequence elements and cellular factors involved in transcriptional control and initiation.
19. The cytoplasmic membrane of which of the following organisms contains sterols?
[A] Clostridum
[B] Proteus
[C] Mycoplasma
[D] Bacillius
Show Answer
Correct Answer: C [Mycoplasma]
Notes:
Mycoplasma is a genus of bacteria that do not have a cell wall surrounding the cell membrane.
20. Which of the following are the functions of the xylem?
[A] transports food through the leaf
[B] transports water from the roots to the leaves
[C] role in the survival of a plant
[D] None of these
Show Answer
Correct Answer: B [transports water from the roots to the leaves]
Notes:
The veins of the leaves are provided with vascular tissue called xylem and phloem. The xylem transports water from the roots to the leaves and the phloem transports food through the leaf to the rest of the plant.
