11. What is the value of the Least Distance of Distinct vision(in cm) for a normal human being?
[A] 58
[B] 2.5
[C] 50
[D] 25
Show Answer
Correct Answer: D [25]
Notes:
The least distance of distinct vision (LDDV) or the reference seeing distance (RSD) is the closest someone with “normal” vision (20/20 vision) can comfortably look at something. The range of vision of a healthy human eye is between it’s near point and far point i.e, from 25cm to infinity.
12. Rickets is caused due to the deficiency of which of the following vitamins?
[A] Vitamin A
[B] Vitamin D
[C] Vitamin C
[D] Low intake of proteins
Show Answer
Correct Answer: B [Vitamin D]
Notes:
Rickets is a skeletal disorder that’s caused by a lack of vitamin D, calcium, or phosphate. These nutrients are important for the development of strong, healthy bones. People with rickets may have weak and soft bones, stunted growth, and, in severe cases, skeletal deformities.
13. Which one of the following statements is not correct? (UPSC Prelims 2002)
[A] The boiling point of an aqueous solution is higher than that of pure water
[B] Addition of solutes to a solution causes an increase in its water potential
[C] The vapour pressure of the water in a solution is lower than that of pure water
[D] When a solution is separated from water by a semi permeable membrane, water movement can be prevented by applying pressure to the solution.
Show Answer
Correct Answer: B [Addition of solutes to a solution causes an increase in its water potential]
Notes:
Adding solute lowers the water potential. When a solution is enclosed by a rigid cell wall, the movement of water into the cell will exert pressure on the cell wall. This increase in pressure within the cell will raise the water potential.
14. Which among the following is the method of growing plants in the absence of soil?
[A] Hydrology
[B] Hydrotectonics
[C] Hydroponics
[D] Hydrochronology
Show Answer
Correct Answer: C [Hydroponics]
Notes:
The method of growing plants in the absence of soil is called as hydroponics. The required suppliments to the plants are supplied through the mineral nutrient solutions.
15. What is the famous Bombyx Mori, a variety of?
[A] Honeybee
[B] Cotton
[C] Earthworm
[D] Silk
Show Answer
Correct Answer: D [Silk]
Notes:
Sericulture – It refers to the rearing of silk worms and obtaining silk from them. It involves raising a feed crop, chiefly mulberry leaves, and tending to silk worms and obtaining silk fibre from the cocoons produced by the worms.
Varieties – There are a number of varieties of worm reared for silk production, the most important variety being Bombyx mori.
16. Who was awarded the Nobel Prize in Medicine for the discovery of cell signalers?
[A] Alfred G. Gilman
[B] Martin Rodbell
[C] Both 1 & 2
[D] None of these
Show Answer
Correct Answer: C [Both 1 & 2]
Notes:
Alfred G. Gilman and Martin Rodbell were awarded the Nobel Prize in Medicine for the discovery of cell signalers called G-proteins.
17. The lysogenic state is controlled by the activity of the regulatory region of the lambda phage genome, this region is called?
[A] immunity repressor
[B] immunity operon
[C] operon repressor
[D] none of these
Show Answer
Correct Answer: B [immunity operon]
Notes:
The lysogenic state is controlled by the activity of the regulatory region of the lambda phage genome, this region is called immunity operon.
18. The cell wall of which of the following is made up of pectin and cellulose?
[A] Sclerenchyma
[B] Parenchyma
[C] Collenchyma
[D] All of the above
Show Answer
Correct Answer: C [Collenchyma]
Notes:
Collenchyma’s cell walls are made up of pectin and cellulose. They are stretched out, living cells with minute intercellular gaps.
19. Periplaneta belongs to which phylum?
[A] Mollusca
[B] Arthropoda
[C] Annelida
[D] Echinodermata
Show Answer
Correct Answer: B [Arthropoda]
Notes:
Periplaneta belongs to the Arthropoda phylum. Arthropoda are triploblastic, coelomate, bilaterally symmetrical, their body is protected by an exoskeleton, made of chitin and their body is divided into three parts – head, followed by the thorax, and finally the abdomen.
20. Which of the following is the cavity between the body wall and the intestinal wall lined by the mesoderm?
[A] Notochord
[B] Coelom
[C] Chordata
[D] None of these
Show Answer
Correct Answer: B [Coelom]
Notes:
The coelom is the cavity between the body wall and the intestinal wall lined by the mesoderm.
