11. Consumption of fish is considered to be healthy when compared to flesh of other animals because fish contains which of the following minerals? (UPSC Prelims 1998)
[A] Polyunsaturated fatty acids
[B] saturated fatty acids
[C] essential vitamins
[D] more carbohydrates and proteins
Show Answer
Correct Answer: A [Polyunsaturated fatty acids]
Notes:
Consumption of fish is considered to be healthy when compared to flesh of other animals because fish contains polyunsaturated fatty acids. Polyunsaturated fatty acid is an anti oxidant, which helps in building of tissues.
12. Epiphytes are plants which depend on other plants for? (UPSC Prelims 2001)
[A] food
[B] mechanical support
[C] shade
[D] water
Show Answer
Correct Answer: B [mechanical support]
Notes:
They are an important source of food for many species. Typically, the older parts of a plant will have more epiphytes growing on them. Epiphytes differ from parasites in that they grow on other plants for physical support and do not necessarily affect the host negatively.
13. Which among the following is not a part of Vitamin B complex?
[A] Vitamin B2
[B] Vitamin B4
[C] Vitamin B6
[D] Vitamin B12
Show Answer
Correct Answer: B [Vitamin B4]
Notes:
Vitamin B complex consists of 8 vitamins namely B1(Thiamine), B2(Riboflavin), B3(Niacin), B5(Pantothenic acid), B6(Pyridoxine), B7(Biotin), B9(Folate/Folic acid) and B12(Cobalamin).
14. Which of the following possesses the characteristics of both plants and animals?
[A] Azolla
[B] Lycopodium
[C] Euglena
[D] Sphagnum
Show Answer
Correct Answer: C [Euglena
]
Notes:
Euglena is an example of the Protista kingdom and has both plant and animal characteristics.
15. Who among the following discovered the ribosome?
[A] George E. Palade
[B] Theodor Boveri
[C] Albert von Kolliker
[D] Robert Brown
Show Answer
Correct Answer: A [George E. Palade]
Notes:
Ribosomes were discovered by George E. Palade. He described them as small particles in the cytoplasm that were preferentially attached to the endoplasmic reticulum membrane.
16. Which bacteria are helpful in the Nitrification Process?
[A] Acetobacter
[B] Nitrosococcus
[C] Campylobacter
[D] Actinomycetes
Show Answer
Correct Answer: B [Nitrosococcus
]
Notes:
Nitrification is the process by which bacteria changes soil ammonia into nitrates. Nitrosococcus, Nitrosomonas, Nitrosospira etc. is the bacteria which is helpful in the Nitrification Process
17. What makes the main difference between pteridophytes and bryophytes?
[A] Spermatozoids
[B] Archegonia
[C] Separate gametophytes
[D] conducting system
Show Answer
Correct Answer: D [conducting system]
Notes:
The main difference between bryophytes and pteridophytes is that the former do not have vascular tissue whereas the latter have vascular tissue.
18. In gymnosperms how many male gametes are produced by each pollen grain?
[A] 4
[B] 3
[C] 2
[D] 1
Show Answer
Correct Answer: C [2]
Notes:
In gymnosperms, there are only 2 male gametes are produced by each pollen grain.
19. A condition in which the stamens are attached to the petals of a flower instead of directly attached to the thalamus is called__?
[A] Epipetalous
[B] Monadelphous
[C] Staminode
[D] Epiphyllous
Show Answer
Correct Answer: A [Epipetalous]
Notes:
A condition in which the stamens are attached to the petals of a flower instead of directly attached to the thalamus is called Epipetalous. Solanum is an example of Epipetalous.
20. What tissues are found in the root and shoot ends of a plant?
[A] Primary Meristem
[B] Secondary Meristem
[C] Promeristem
[D] Apical Meristem
Show Answer
Correct Answer: C [Promeristem]
Notes:
The promeristem is the oldest and the smallest meristem tissue. It originates from the embryo. The primary meristem arises from the promeristem. It is found in the root and shoots tips.
