11. Auxiliary bud develops into which of the following parts of the plant?
[A] Fruit
[B] Leaf
[C] Roots
[D] Branch
Show Answer
Correct Answer: D [Branch]
Notes:
The axillary bud is a bud that develops in the axil of a leaf of a plant (synonymous with lateral bud). Axillary buds develop from the nodes which then becomes a new stem.
12. Which of the following is the reason behind bleeding through nose in high mountain regions? (UPSC Prelims 1979).
[A] The pressure of the blood capillaries is higher than the outside pressure
[B] The pressure at high altitudes is greater than that in the plains
[C] The blood pressure increases at high altitudes
[D] The blood pressure decreases at high altitudes
Show Answer
Correct Answer: A [The pressure of the blood capillaries is higher than the outside pressure]
Notes:
As altitude increases, the availability of oxygen decreases, making the air thinner and drier. Dry climates can cause drying and cracking inside the nose, which can lead to a nosebleed. The climate inside nose gets drier. This makes the blood vessels exposed inside your nose more likely to burst there than at lower altitudes.
13. Which of the following is the easiest way of finding out the nutritional status for large number of children in a short time? (UPSC Prelims 1982)
[A] Studying their behaviour
[B] Studying their hair, face and eyes
[C] Measuring their height and weight
[D] All of the above
Show Answer
Correct Answer: C [Measuring their height and weight]
Notes:
The nutritional status of a large number of children can be calculated by knowing their body mass index .It is a physical measurement used to assess total amount of body fat. It is calculated by dividing your weight in kilograms (kg) by the square of your height in metres (m2). Depending on the BMI value calculated, one may be underweight, normal weight, overweight or obese.
14. In a bisexual flower, if androecium and gynaecium mature at different times, which of the following is the name given to the phenomenon? (UPSC Prelims 2002)
[A] Dichogamy
[B] Herkogamy
[C] Heterogamy
[D] Monogamy
Show Answer
Correct Answer: A [Dichogamy]
Notes:
Dichogamy is the condition in which the male and female reproductive organs of a flower mature at different times, thereby ensuring that self-fertilization does not occur.
15. Which vitamin is also called as retinol?
[A] Vitamin A
[B] Vitamin C
[C] Vitamin D
[D] Vitamin K
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Vitamin A is also called as retinol deficiency of which results in xeropthalmia. Chemical formula for Vitamin A is C20H30O.
16. 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.
17. Which statement is true for the capsid?
[A] It consists of capsomeres
[B] This the outermost layer of most viruses
[C] It protects genetic material
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
A capsid is the protein shell of a type of virus, which encloses its genetic material.
18. 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.
19. What type of embryo is most often used for viral assays?
[A] Mouse
[B] Rat
[C] Cat
[D] Chicken
Show Answer
Correct Answer: D [Chicken]
Notes:
Chicken is a type of embryo is most often used for viral assays.
20. Which of the following is a non-vascular endosperm?
[A] Thallophyta
[B] Bryophyta
[C] Pteridophyta
[D] All the above
Show Answer
Correct Answer: B [Bryophyta]
Notes:
Xylem and phloem are not found in Bryophyta, so they are called non-vascular embryophytes.
