11. Which of the following vitamins was discovered by Sir Edward Mellanby?
[A] Vitamin C
[B] Vitamin D
[C] Vitamin K
[D] Vitamin E
Show Answer
Correct Answer: B [Vitamin D]
Notes:
Vitamin D was discovered by Sir Edward Mellanby.
12. Which bacteria are involved in the oxidation of ammonia into nitrate?
[A] Acetobactor
[B] Nitrococcus
[C] Nitrobacter
[D] Both Nitrococcus and Nitrobacter
Show Answer
Correct Answer: D [Both Nitrococcus and Nitrobacter]
Notes:
The conversion of ammonia into nitrate is a two-step process where ammonia is initially oxidised to nitrite by Nitrosomonas or Nitrococcus, this nitrite is then further oxidised to nitrate by Nitrobacter. This series of conversion is known as nitrification and is an important part of the nitrogen cycle, which is crucial for primary productivity in many ecosystems.
13. 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.
14. In which group would you place a plant that produces spores, lacks seeds, and has vascular tissue?
[A] Bryophyte
[B] Algae
[C] Pteridophyte
[D] Gymnosperm
Show Answer
Correct Answer: C [Pteridophyte]
Notes:
Pteridophyte is a vascular plant that disperses spores as pteridophytes produce neither flowers nor seeds.
15. Most gymnosperms are__?
[A] Xerophytic
[B] Hydrophytic
[C] Halophytic
[D] Epiphytic
Show Answer
Correct Answer: A [Xerophytic ]
Notes:
Most gymnosperms are Xerophytic. Gymnosperms are flowerless plants that produce cones and seeds.
16. Gymnosperms are never__?
[A] medium-sized trees
[B] tall trees
[C] herbs
[D] shrubs
Show Answer
Correct Answer: C [herbs]
Notes:
Living gymnosperms are predominantly middle-sized trees to tall trees and shrubs Rarely they are woody climbers. There are no herbs in gymnosperms.
17. In anaerobic respiration, glucose is broken down into what?
[A] ethyl alcohol
[B] carbon dioxide
[C] energy
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Glucose breaks down into ethyl alcohol, carbon dioxide, and energy.
Glucose → Alcohol + Carbon dioxide + Energy
18. What are the functions of flowers?
[A] Pollination
[B] Reproduction
[C] Fruit formation
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Flowers are the most colorful component of the plant. The functions of flowers are pollination, reproduction, and fruit formation.
19. Which one disease of wheat causes a restriction in the export of wheat from India?
[A] Powdery mildew
[B] Karnal bunt
[C] Black rust
[D] Flag smut
Show Answer
Correct Answer: B [Karnal bunt]
Notes:
Tilletia indica causes karnal bunt disease in wheat. It is one such fungal pathogen of high quarantine importance that restricts free global trade of wheat along with loss of quality as well as yield of cereals.
20. Periplaneta belongs to which phylum?
[A] Mollusca
[B] Arthropoda
[C] Annelida
[D] Echinodermata
Show Answer
Correct Answer: B [Arthropoda]
Notes:
Periplaneta belongs to the Arthropoda phylum. Arthropoda are triploblastic, coelomate, bilaterally symmetrical, their body is protected by an exoskeleton, made of chitin and their body is divided into three parts – head, followed by the thorax, and finally the abdomen.
