11. Green Algae are known as__?
[A] Rhodophyceae
[B] Chlorophyceae
[C] Phaeophyceae
[D] Green tide
Show Answer
Correct Answer: B [Chlorophyceae]
Notes:
Algae is a Thalloid plant and autotrophic in nature. Mostly algae is aquatic and contains chlorophyll. Green algae is also known as Chlorophyceae.
12. The change from lysogeny to lymph is usually induced by?
[A] ultraviolet light
[B] chemicals
[C] irradiation
[D] all of these
Show Answer
Correct Answer: A [ultraviolet light]
Notes:
The change from lysogeny to lymph is usually induced by ultraviolet light. Lysogeny is a type of life cycle that occurs when a bacteriophage infects certain types of bacteria.
13. What type of embryo is most often used for viral assays?
[A] Mouse
[B] Rat
[C] Cat
[D] Chicken
Show Answer
Correct Answer: D [Chicken]
Notes:
Chicken is a type of embryo is most often used for viral assays.
14. Bacteria come under which type of organisms?
[A] Single-celled
[B] Microscopic
[C] Living
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Bacteria are single-celled microorganisms that do not have a nucleus and other cell organelles. They are classified as prokaryotic organisms.
15. Which of the following may be most likely to be missing from a gram-positive bacterium?
[A] Penicillin-binding protein
[B] Peptidoglycan
[C] Lipopolysaccharide
[D] Phospholipid bilayer membrane
Show Answer
Correct Answer: C [Lipopolysaccharide]
Notes:
Gram-negative bacteria are surrounded by a thin peptidoglycan cell wall. It itself is surrounded by an outer membrane containing lipopolysaccharides.
16. A bryophyte that has nitrogen-fixing blue-green algae in its thallus is__?
[A] Pogonatum
[B] Riccia
[C] Marchantia
[D] Anthoceros
Show Answer
Correct Answer: D [Anthoceros]
Notes:
A bryophyte that has nitrogen-fixing blue-green algae in its thallus is Anthoceros. Species of Anthoceros have a small to medium-sized green thallus.
17. Which of the following is absent in the phloem of pteridophytes?
[A] Bast fibers
[B] Companion cells
[C] Phloem parenchyma
[D] sieve cells
Show Answer
Correct Answer: B [Companion cells]
Notes:
Pteridophytes are vascular, spore-forming, non-seed-forming, non-flowering plants. The phloem of pteridophytes does not have companion cells.
18. In gymnosperms, pollen drop is the__?
[A] Red drop
[B] Pollens dropped by wind
[C] Secretion of nucellus
[D] Water drops
Show Answer
Correct Answer: C [Secretion of nucellus]
Notes:
In gymnosperms, the pollen drop is a liquid droplet or a liquid nucellus secretion. It accumulates at the top of the ovum and when dried, it moves to the ovule of the gymnosperm for fertilization of the ovum.
19. The energy wastage in plants occurs during which of the following?
[A] Dark reaction
[B] Photosynthesis
[C] Photorespiration
[D] None of these
Show Answer
Correct Answer: C [Photorespiration]
Notes:
Light helps in the dissipation of respiratory energy where the stomata get clogged during the day due to water stress. Photorespiration protects the plant from photooxidative damage by dissipating excess excitation energy.
20. What type of stem is a rhizome?
[A] non-green with distinct nodes and internodes
[B] auxiliary as well as apical buds
[C] brownish in colour
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
The rhizomes are non-green with distinct nodes and internodes, auxiliary as well as apical buds, and are brown in color.
