11. Which one of the following is a membrane that protects the developing embryo from desiccation? (UPSC Prelims 1995)
[A] Amnion
[B] Allantois
[C] Chorion
[D] Yolk sac
Show Answer
Correct Answer: A [Amnion]
Notes:
The amnion or amniotic sac protects everyone embryo from desiccation, it contains amniotic fluid which cushions the embryo from shocks.
12. Which vitamin is also called as niacin?
[A] Vitamin C
[B] Vitamin B3
[C] Vitamin B12
[D] Vitamin B9
Show Answer
Correct Answer: B [Vitamin B3]
Notes:
Vitamin B3 is also called as niacin/Nicotinic acid with chemical formula C6H5NO2. Niacin is water soluble vitamin.
13. Trichology is related to which of the following statement?
[A] Study of nutrition
[B] Study of skin and stuffing
[C] Study of bony joints and ligaments
[D] Study of hair
Show Answer
Correct Answer: D [Study of hair]
Notes:
Trichology is the science of the structure, function and diseases of human hair.
14. Study of Porifera (sponges) is known as __?
[A] Parazoology
[B] Palaeozoology
[C] Zoophytology
[D] None of these
Show Answer
Correct Answer: A [Parazoology]
Notes:
Parazoology is the branch of zoology that deals with the study of parazoa, primitive multicellular animals that lack true tissues and organs. It encompasses the study of Porifera (sponges), one of the most primitive animal phyla that date back to the Precambian era over 600 million years ago.
15. In which branch of biology is the study of breasts deals?
[A] Mammology
[B] Mastology
[C] Malacology
[D] None of these
Show Answer
Correct Answer: B [Mastology]
Notes:
Mastology can refer to the study of the human breast and related diseases.
16. Which of the following person related to the invention of DDT?
[A] Paul Muller
[B] Roe Berth
[C] Frances Kelsey
[D] Jack Horner
Show Answer
Correct Answer: A [Paul Muller]
Notes:
DDT was first synthesized in 1874 by Austrian chemist Othmar Zidler. The insecticidal action of DDT was discovered in 1939 by the Swiss chemist Paul Hermann Müller.
17. Which disinfectant is effective against viruses?
[A] Hydrogen peroxide
[B] Hypochlorite
[C] Formaldehyde
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Hydrogen peroxide, Hypochlorite and Formaldehyde are disinfectants is effective against viruses.
18. Cycas, Pinus, Ephedra are examples of which of the following?
[A] Gymnosperms
[B] Angiosperms
[C] Pteridophyta
[D] None of these
Show Answer
Correct Answer: A [Gymnosperms]
Notes:
Cycas, Pinus, Ephedra are examples of Gymnosperms. Gymnosperms have a well differentiated plant body and vascular tissue. They bear naked seeds, (the seeds are not enclosed within a fruit).
19. Which of the following happens in Gram-positive cells?
[A] second outer membrane that helps to retain the crystal violet stain
[B] multiple layer of peptidoglycan that helps to retain the crystal violet stain
[C] thick capsule that traps the crystal violet stain
[D] periplasmic space that traps the crystal violet
Show Answer
Correct Answer: B [multiple layer of peptidoglycan that helps to retain the crystal violet stain]
Notes:
Multiple layer of peptidoglycan that helps to retain the crystal violet stain is happens in Gram-positive cells. Gram-positive organisms have a thicker peptidoglycan cell wall than Gram-negative bacteria.
20. What is a motile flagellated asexual cell called?
[A] Sperm
[B] Zoospore
[C] Oospore
[D] Androspore
Show Answer
Correct Answer: B [Zoospore]
Notes:
A zoospore is a motile asexual spore that uses the flagellum for locomotion. These are also called swarm spores.
