11. The young chicks come out of eggs within how many days after being hatched by the hen? (UPSC Prelims 1979).
[A] One week
[B] Two weeks
[C] Three weeks
[D] Four weeks
Show Answer
Correct Answer: C [Three weeks]
Notes:
A hen that is committed to hatching chicks is known as a broody. The state of being broody is controlled by instinct, hormones and lighting conditions. Chicken come out of the eggs within the 21 days after being hatched by the hen. Some breeds take a little less and some a little longer. If the egg has not hatched after 25 days, it should be removed from the broody hen or incubator. Eggs need constant heat during the full incubation period for the embryo to develop into a chick.
12. Which of the following is the ready source of energy available for athletes? (UPSC Prelims 1982)
[A] Vitamins
[B] Fats
[C] Proteins
[D] Carbohydrates
Show Answer
Correct Answer: D [Carbohydrates]
Notes:
Carbohydrates are the ready source fo energy for the athletes. Carbohydrates improve athletic performance by delaying fatigue and allowing an athlete to compete at higher levels longer nutrients such as fat or muscle protein are utilized to make energy.
13. Consider the following statements:
- Tapeworm is a hermaphrodite.
- Round-worm has separate sexes.
- Filaria is caused by a nematode.
- Guinea-worm is an annelid.
Which of these are correct? (UPSC Prelims 2001)
[A] Only 1 and 2
[B] 1, 2 and 3
[C] 3 and 4
[D] 2, 3 and 4
Show Answer
Correct Answer: B [1, 2 and 3]
Notes:
Filariasis is a parasitic disease caused by an infection with roundworms of the Filarioidea type. These are spread by blood-feeding diptera such as black flies and mosquitoes. Lymphatic filariasis is caused by the worms Wuchereria bancrofti, Brugia malayi, and Brugia timori. Unlike this, a tapeworm is a hermaphrodite, which means that it has both male and female reproductive organs, and Round-worm has separate sexes.
14. Seed germination takes place in which of the following layers of soil profile?
[A] Organic layer
[B] Surface/A layer
[C] B layer
[D] C layer
Show Answer
Correct Answer: B [Surface/A layer]
Notes:
Surface layer/ A layer which is rich in humus content is responsible for seed germination. Living organisms which aids the production (such as earthworms) also are present in this layer.
15. Which among the following blood groups is referred as the universal donor blood group?
[A] O -ve
[B] O +ve
[C] AB -ve
[D] AB +ve
Show Answer
Correct Answer: A [O -ve]
Notes:
The person with O-ve blood group is considered as the universal donor. Whereas a person with O +ve is not a universal donor as O +ve consists of Rh(Rhesus) factor which makes it incompatible for Rh -ve bloods.
16. Which tissue of plant is used to transport food to various parts?
[A] Xylem
[B] Parenchyma
[C] Sclerenchyma
[D] Phloem
Show Answer
Correct Answer: D [Phloem]
Notes:
Phloem, also called bast, are tissues in plants that conduct foods made in the leaves to all other parts of the plant. This transport process is called translocation. Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.
17. What is another name for cyanobacteria?
[A] Blue-green algae
[B] Protists
[C] Golden algae
[D] Slime moulds
Show Answer
Correct Answer: A [Blue-green algae]
Notes:
Cyanobacteria, also called blue-green algae, are microscopic organisms found naturally in all types of water.
18. In which part of the body cholesterol is synthesized?
[A] Pancreas
[B] Liver
[C] Spleen
[D] Stomach
Show Answer
Correct Answer: B [Liver]
Notes:
Cholesterol is a type of Lipid or the fat present in blood. The majority of the cholesterol consumed by the human body on a daily basis is synthesised by Liver.
19. Which of the following can be done in the cultivation of plant viruses?
[A] tissue culture
[B] cultures of separated cells
[C] whole plants
[D] all of these
Show Answer
Correct Answer: D [all of these]
Notes:
The cultivation of plant viruses can be done in tissue culture, cultures of separated cells and whole plants.
20. What is an evolutionary important character of Selaginella?
[A] Strobili
[B] Rhizophore
[C] Heterosporous nature
[D] Ligule
Show Answer
Correct Answer: C [Heterosporous nature]
Notes:
The evolutionary important character of Selaginella is the heterogametic nature. Selaginella produces two types of spores, microspores and megaspores and in heterospory, the life cycle of Selaginella leads to seed habit formation.
