11. At what age Wisdom teeth normally grow? (UPSC Prelims 1985)
[A] 34—40 years
[B] 12—15 years
[C] 17—30 years
[D] 40—45 years
Show Answer
Correct Answer: C [17—30 years]
Notes:
The age at which wisdom teeth come through is variable but generally occurs between late teens and early twenties. Most adults have four wisdom teeth, one in each of the four quadrants, but it is possible to have none, fewer or more in which case the extras are called supernumerary teeth.
12. Water hyacinth is related to which of the following genus? (UPSC Prelims 1988)
[A] Lemna
[B] Pistia
[C] Eichhornia
[D] None of these
Show Answer
Correct Answer: C [Eichhornia]
Notes:
Water hyacinth, an aquatic plant of the genus Eichhornia of the pickerelweed family, consisting of about five species is native primarily to tropical America. Some species float in shallow water; others are rooted in muddy stream banks and lakeshores.
13. Which of the following microorganisms causes Ring worm? (UPSC Prelims 1990)
[A] Bacterium
[B] Fungus
[C] Virus
[D] Worm
Show Answer
Correct Answer: B [Fungus]
Notes:
Ringworm isn’t a worm. It’s a skin infection that’s caused by moldlike fungi that live on the dead tissues of your skin, hair, and nails. It can occur at any place and on your scalp. When one gets it between the toes, it’s what people call athlete’s foot.
14. Which one of the following is not an essential micronutrient for plants? (UPSC Prelims 1996)
[A] Boron
[B] Zinc
[C] Sodium
[D] Copper
Show Answer
Correct Answer: C [Sodium]
Notes:
There are 13 essential nutrients required by plants for its healthy and proper growth. Now these nutrients are divided into two categories:
Macronutrients (nitrogen, phosphorus, potassium, calcium, magnesium and sulphur)
Micronutrients (iron, copper, manganese, zinc, boron, molybdenum and chlorine)
Additional mineral nutrient elements which are beneficial but not necessary are sodium, cobalt, vanadium, nickel, solenium, aluminium and silicon. Thus boron, zinc and copper falls into category of essential micronutrients while sodium does not.
15. Biometric is related to which of the following statement?
[A] the process of ageing, and the particular problems of old people
[B] heredity and variation
[C] body measurements and calculations related to human characteristics
[D] transmission of paternal traits to progeny
Show Answer
Correct Answer: C [body measurements and calculations related to human characteristics]
Notes:
Biometrics are calculations related to body measurements and human characteristics. Biometric authentication is used in computer science as a form of identification and access control.
16. The Study of Bryophytes & pteridophytes is known by Which terms?
[A] Cytology
[B] Bryology
[C] Mycology
[D] Pomology
Show Answer
Correct Answer: B [Bryology]
Notes:
Bryology is the branch of botany that deals with the scientific study of bryophytes such as mosses, liverworts, and hornworts.
17. Who gave the theory of Five King of Classification?
[A] RH Whittaker
[B] Ernest Haeckel
[C] Copeland
[D] Carolus Linnaeus
Show Answer
Correct Answer: A [RH Whittaker]
Notes:
The theory of Five Kingdom of classification (Monera, Protista, Fungi, Plantae and Animalia) is given by R. H. Whittaker in 1969.
18. Who is known as the “Father of Phycology”?
[A] Fritsch
[B] Papenfus
[C] Smith
[D] Morris
Show Answer
Correct Answer: A [Fritsch]
Notes:
FE Fritsch (1935) in his book “Structure and Reproduction of Algae” divided algae into the following eleven classes. It is mainly based on pigmentation, reserve food and flagellar, thallus structure, mode of reproduction, and life cycle. Hence he is known as the father of algae.
19. Where are the protons stored in the mitochondria?
[A] inner membrane
[B] intermembrane space
[C] outer membrane
[D] none of these
Show Answer
Correct Answer: B [intermembrane space]
Notes:
In the mitochondria, the hydrogen ions, these protons, are concentrated in the intermembrane space due to the electron transport chain.
20. Which of the following is a heterotrophic plant?
[A] Parasitic
[B] Insectivorous
[C] Symbiotic
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Heterotrophic plants which are mainly classified on the basis of their mode of nutrition are parasites, insect eaters, mortal, symbiotic.
