11. In the eye donation, which part of the eye is transplanted from the donor? (UPSC Prelims 2001)
[A] Cornea
[B] Lens
[C] Retina
[D] The whole eye
Show Answer
Correct Answer: A [Cornea]
Notes:
There is currently no way to transplant an entire eye. Ophthalmologists can, however, transplant a cornea. When someone says they are getting an “eye transplant,” they are most likely receiving a donor cornea, which is the clear front part of the eye that helps focus light so that you can see.
12. Which vitamin is also called as riboflavin?
[A] Vitamin B1
[B] Vitamin B2
[C] Vitamin B3
[D] Vitamin B6
Show Answer
Correct Answer: B [Vitamin B2]
Notes:
Vitamin B2 is also called as riboflavin. Chemical formula of vitamin B2 is C17H20N4O6.
13. A.I. Oparin is related to which of the following theories in the field of biology?
[A] Chemosynthetic theory
[B] A Theory of Life
[C] Infectious Disease Theory
[D] A Theory of the Origin of Eukaryotic Cells
Show Answer
Correct Answer: A [Chemosynthetic theory]
Notes:
The Chemosynthetic theory of origin of life was proposed by A.I. Oparin. Chemosynthetic theory states that life originated on earth through a series of collections of chemical elements in the water.
14. Who among the following discovered Vitamin E?
[A] Evans and Bishop
[B] Henrik Dam
[C] Harry Holmes and Ruth Corbet
[D] Sir Edward Mellanby
Show Answer
Correct Answer: A [Evans and Bishop]
Notes:
Vitamin E was discovered by Evans and Bishop in 1922. Work in the 1930s revealed the chemical structure and biological function of alpha-tocopherol.
15. The protein from which the hooks and filaments of the flagella are made is called?
[A] keratin
[B] flagellin
[C] gelatin
[D] casein
Show Answer
Correct Answer: B [flagellin]
Notes:
The flagellar filament is composed of a single protein called flagellin.
16. Covered smut of Sorghum is caused by which of the following?
[A] Sphacelotheca sorghi
[B] Sphacelotheca cruenta
[C] Sphacelotheca reiliana
[D] Tolyposporium ehrenbergii
Show Answer
Correct Answer: A [Sphacelotheca sorghi]
Notes:
Sporisorium sorghi is a fungus in the family of Ustilaginaceae. It is a plant pathogen that causes the covered scum of sorghum.
17. 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.
18. In gymnosperms, pollen drop is the__?
[A] Red drop
[B] Pollens dropped by wind
[C] Secretion of nucellus
[D] Water drops
Show Answer
Correct Answer: C [Secretion of nucellus]
Notes:
In gymnosperms, the pollen drop is a liquid droplet or a liquid nucellus secretion. It accumulates at the top of the ovum and when dried, it moves to the ovule of the gymnosperm for fertilization of the ovum.
19. Which of the following is called Calyx?
[A] the outermost whorl of a flower
[B] consists of many numbers of petals
[C] four-lobed sac-like structure responsible for pollen formation
[D] thread-like structures are attached to the anther
Show Answer
Correct Answer: A [the outermost whorl of a flower]
Notes:
The calyx is the outermost circle of a flower. It includes units called sepals.
20. Which of the following is an example of a plant with a Fibrous Root System?
[A] Carrot
[B] Onion
[C] Oak Tree
[D] Turnip
Show Answer
Correct Answer: B [Onion]
Notes:
A fibrous root system is characteristic of grasses and other monocotyledons like onions. Unlike in the taproot system of dicotyledonous plants where one major root originates from the stem and smaller roots arise off of this taproot, in a fibrous root system many equally sized roots arise off of the stem. These types of roots cover a larger surface area and are therefore better at absorbing nutrients and water from the soil.
