11. Which of the following branch of biology deals with the study of viruses?
[A] Cytology
[B] Mycology
[C] Virology
[D] Taxonomy
Show Answer
Correct Answer: C [Virology]
Notes:
Virology, the branch of microbiology that deals with the study of viruses.
12. Who gave theory of photosynthesis?
[A] Maurice Hilleman
[B] Jack Horner
[C] Jan Ingenhousz
[D] Franz Mesmer
Show Answer
Correct Answer: C [Jan Ingenhousz]
Notes:
Jan Ingenhausen is a Dutch-born British physician and scientist, best known for his discovery of the process of photosynthesis, by which green plants absorb carbon dioxide and release oxygen in sunlight.
13. Which of the following person related to the invention of DDT?
[A] Paul Muller
[B] Roe Berth
[C] Frances Kelsey
[D] Jack Horner
Show Answer
Correct Answer: A [Paul Muller]
Notes:
DDT was first synthesized in 1874 by Austrian chemist Othmar Zidler. The insecticidal action of DDT was discovered in 1939 by the Swiss chemist Paul Hermann Müller.
14. What is Rancidity?
[A] Deterioration of Fat
[B] Deterioration of Glucose
[C] Deterioration of Protein
[D] Deterioration of Vitamins
Show Answer
Correct Answer: A [Deterioration of Fat]
Notes:
The process of oxidation of oily and Fatty food, which changes its taste and smell is known as Rancidity. Rancidity generally occurs in Fat.
15. Which of the following is a plant without seed vascular tissue?
[A] Angiosperm
[B] Pteridophytes
[C] Bryophytes
[D] Gymnosperms
Show Answer
Correct Answer: B [Pteridophytes]
Notes:
Pteridophytes are the most primitive vascular plants. It is a simple reproductive system that does not have flowers and seeds.
16. Which of the following is true about the cell wall of Gram-positive bacteria?
[A] It consists of multiple layers
[B] It is thicker than that associated with gram-negative bacteria
[C] It contains teichoic acids
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
The cell wall of Gram-positive bacteria are: consists of multiple layers, thicker than that associated with gram-negative bacteria and contains teichoic acids.
17. What is a motile flagellated asexual cell called?
[A] Sperm
[B] Zoospore
[C] Oospore
[D] Androspore
Show Answer
Correct Answer: B [Zoospore]
Notes:
A zoospore is a motile asexual spore that uses the flagellum for locomotion. These are also called swarm spores.
18. Where is the phloem located?
[A] outer side of the vascular bundle.
[B] centre of the vascular bundle
[C] marginal regions of leaves and stems
[D] None of these
Show Answer
Correct Answer: A [outer side of the vascular bundle.]
Notes:
The xylem is located towards the adaxial surface of the leaf, whereas the phloem is located towards the axial surface of the leaf.
19. The increase in shoot and root length is called which of the following?
[A] Primary growth
[B] Secondary growth
[C] Little growth
[D] None of these
Show Answer
Correct Answer: A [Primary growth]
Notes:
The increase in the length of shoot and root is called primary growth. This shoot is the result of cell division in the apical meristem.
20. Which of the following stimulates by gibberellin hormone?
[A] shoot elongation
[B] seed germination
[C] fruit and flower maturation
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Gibberellins hormones stimulate shoot elongation, seed germination, and fruit and flower maturation.
