11. Which part of the plant gives us saffron?
[A] Petals
[B] Stigma
[C] Roots
[D] Stem
Show Answer
Correct Answer: B [Stigma]
Notes:
The dried stigmas (thread-like parts of the flower) are used to make saffron spice. It can take 75,000 saffron blossoms to produce a single pound of saffron spice. Saffron is largely cultivated and harvested by hand.
12. Which of the following is the main constituent of the Gobar gas? (UPSC Prelims 1979).
[A] Carbon dioxide
[B] Methane
[C] Ethylene
[D] Carbon monoxide
Show Answer
Correct Answer: B [Methane]
Notes:
Biogas or Gobar gas is produced by the breakdown of organic matter in the absence of oxygen. It can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. It is a renewable energy source. It comprises primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes. It is produced by anaerobic digestion.
13. Phenylketonuria is an example of an in born error of metabolism. This “error” refers to which of the following phenomenon? (UPSC Prelims 1994)
[A] hormonal overproduction
[B] atrophy of endocrine glands
[C] Inherited deficiency of an enzyme
[D] non-disjunction
Show Answer
Correct Answer: C [Inherited deficiency of an enzyme]
Notes:
Classic phenylketonuria results from deficient activity of phenylalanine hydroxylase, usually due to variants in the PAH gene. Phenylalanine then accumulates because it cannot be metabolised normally to tyrosine. It is an inherited metabolic defect, not atrophy of endocrine glands.
14. Which vitamin is also called as “Pantothenic acid”?
[A] Vitamin K
[B] Vitamin D
[C] Vitamin B3
[D] Vitamin B5
Show Answer
Correct Answer: D [Vitamin B5]
Notes:
Vitamin B5 is also called as Pantothenic acid and it was discovered by Roger J.Williams in 1933. Chemical formula for Vitamin B5 is C9H17NO5.
15. Who among the following is considered as the father of modern ecology?
[A] Ramdeo Misra
[B] Parthasarthy Iyengar
[C] Eugene Odum
[D] Theophrastus
Show Answer
Correct Answer: C [Eugene Odum]
Notes:
Eugene Odom is known throughout science as the father of modern ecology.
16. Which of the following algae is used to make iodine?
[A] Macrocystis
[B] Surgassum
[C] Synechococcus
[D] Anabina
Show Answer
Correct Answer: A [Macrocystis]
Notes:
Laeminaria and Macrocystis are algae used in Iodine making. Anabina is used as a biofertilizer.
17. Which of the following statements regarding algae is incorrect.
[A] Most algae are photosynthetic
[B] Algae can be classified according to their pigments
[C] All algae are filamentous
[D] Spirogyra does not produce zoospores
Show Answer
Correct Answer: C [All algae are filamentous]
Notes:
Most algae are photosynthetic, Algae can be classified according to their pigments and Spirogyra does not produce zoospores.
18. Pyrenoids are the center of the formation of__?
[A] Enzymes
[B] Proteins
[C] Fats
[D] Starch
Show Answer
Correct Answer: D [Starch]
Notes:
Pyrenoids are the center of the formation of Starch. Pyrenoids are non-membrane-bound organelles found in the chloroplasts of algae and hornwort plants. It can be seen by light-microscopy.
19. Which of the following is wrong for bryophytes?
[A] Vascular tissue lacking clear
[B] Independent sporophyte absent clear
[C] Gametophyte reduced and dependent done
[D] Asexual reproduction by zoospores absent
Show Answer
Correct Answer: C [Gametophyte reduced and dependent done]
Notes:
The main plant of Bryophyta is the gametophyte. The gametophytic stage is independent.
20. Intercalary Meristem is found in which of the following?
[A] grass
[B] monocots
[C] pines
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Intercalary Meristem is found in grass, monocots, and pines. It is a part of the apical meristem and it increases the height of the plant.
