11. Which among the following nitrogenous wastes requires the least water for its excretion?
[A] Ammonia
[B] Urea
[C] Nitrites
[D] Uric Acid
Show Answer
Correct Answer: D [ Uric Acid]
Notes:
Uric acid is not soluble in water and is excreted as a dry crystal by the animal’s digestive system. Ammonia is the most toxic nitrogenous waste and must be excreted in large volumes of water.
12. Which one of the following creatures has maximum number of ribs?
[A] Ray fish
[B] Flying mammal
[C] Snake
[D] Crocodile
Show Answer
Correct Answer: C [ Snake ]
Notes:
Snakes have the maximum number of ribs. On an average they have 200 to 400 bones (Vertibrae ) and each have a pair of ribs on either side.
13. Guttation takes place due to the development of which of the following?
[A] Cells
[B] Transpiration
[C] Root pressure
[D] All of the above
Show Answer
Correct Answer: C [Root pressure]
Notes:
Guttation takes place due to the development of root pressure. Guttation is the exudation of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses and a number of fungi.
14. Which of the following can be checked by doctors with the help of Pulse reading? (UPSC Prelims 1979).
[A] Temperature
[B] Heart beat
[C] Blood pressure
[D] Respiration rate
Show Answer
Correct Answer: B [Heart beat]
Notes:
Pulse rate is the number of heart beats per minute. The resting pulse rate for an average adult is between 60 and 80 beats per minute. It can go up to 130–150 beats per minute when you’re exercising because the body needs more oxygen. The study of the pulse is known as sphygmology.
15. 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.
16. Where is eustachian tube present in the human body?
[A] Heart
[B] Lungs
[C] Ear
[D] Small Intestine
Show Answer
Correct Answer: C [Ear]
Notes:
Eustachian tube connects the middle ear and nasopharynx. This tube controls the pressure inside the ear and makes it equal to the pressure outside the body.
17. The branch of science that deals with the study of the mental faculties of the brain including emotions is known as__?
[A] Phenology
[B] Phycology
[C] Phrenology
[D] Proctology
Show Answer
Correct Answer: C [Phrenology]
Notes:
The branch of science that deals with the study of the mental faculties of the brain including emotions is known as Phrenology.
18. Which sugar is present in RNA?
[A] Hexose
[B] Ribose
[C] Fructose
[D] Glucose
Glucose
Show Answer
Correct Answer: B [Ribose]
Notes:
Ribose is a simple sugar present in RNA. The chemical formula of ribose is C5H10O5, Hexose (C6H1206), Glucose (C6H12O6).
19. What is involved in the release of pollen grains?
[A] Pectin and cellulose
[B] Lignocellulose
[C] Pollenkit
[D] Sporopollenin
Show Answer
Correct Answer: D [Sporopollenin]
Notes:
Sporopollenin is the most chemically inert organic polymer. It is a major component of the tough outer (outer) walls of plant spores and pollen grains.
20. Vaucheria and Chara are examples of?
[A] Euglenophyta
[B] Coenocytic
[C] Rhodophyta
[D] None of these
Show Answer
Correct Answer: B [Coenocytic]
Notes:
No septa are found in Vaucheria except in the reproductive stage. Many of its nuclei are moved around which is known as the alga coenocytic thallus.
