1. Which among the following plants is known as Indian ginseng?
[A] Withania somnifera
[B] Datura ceratocaula
[C] Iberis amara
[D] Capsella bursa pastoris
Show Answer
Correct Answer: A [Withania somnifera]
Notes:
Withania somnifera or commonly called as Ashwagandha is known as Indian ginseng.
2. Consider the following statements:
- Color blindness is more common in men.
- Color blindness is an X-linked recessive trait.
- If both the X chromosomes are defective, a woman may have color blindness.
Which of the above statements are correct?
[A] Only 1
[B] 1, 2 and 3
[C] 2 and 3
[D] Only 1 and 2
Show Answer
Correct Answer: B [1, 2 and 3]
Notes:
Color blindness is more prevalent in men as it is an X-linked recessive disorder. Men, having only one X chromosome, are more susceptible if it is defective. Women, with two X chromosomes, become color blind only if both carry the defective gene. All three statements accurately describe the inheritance and prevalence of color blindness.
3. Dehydration in human body is caused due to the deficiency of which of the following?
[A] Water
[B] Hormones
[C] Vitamin
[D] Salt
Show Answer
Correct Answer: A [Water]
Notes:
Dehydration is a deficiency of water in thebody. Vomiting, diarrhea, excessive sweating, burns, kidney failure, and use of diuretics maycause dehydration. People feel thirsty, and asdehydration worsens, they may sweat less and excrete less urine.
4. In humans, the sound is produced by the which of the following?
[A] epiglottis
[B] oesophagus
[C] larynx
[D] medulla
Show Answer
Correct Answer: C [larynx]
Notes:
The larynx is another name for the voice box. It’s a tube about 2 inches (5cm) long in adults. It sits above the windpipe (trachea) in the neck and in front of the food pipe.
5. Which of the following is the later (Second) formed primary xylem elements?
[A] Xylem fibres
[B] Metaxylem
[C] Xylem parenchyma
[D] Protoxylem
Show Answer
Correct Answer: B [Metaxylem]
Notes:
Metaxylem is the part of the primary xylem that differentiates after the protoxylem and that is distinguished typically by broader tracheids and vessels with pitted or reticulate walls.
6. 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.
7. Which one of the following is cultivated by transplanting seedlings? (UPSC Prelims 1997)
[A] Maize
[B] Sorghum
[C] Onion
[D] Soyabean
Show Answer
Correct Answer: C [Onion]
Notes:
Onions can be grown from seeds, seedlings and bulblets. Proper nursery management and transplanting are important operations in the onion crop. About 0.05 hectare nursery bed area is enough for getting seedlings to transplant in one hectare.
8. Which of the following is commercially produced from Hybridoma technology? (UPSC Prelims 2000)
[A] Monoclonal antibodies
[B] interferon
[C] antibodies
[D] alcohol
Show Answer
Correct Answer: A [Monoclonal antibodies]
Notes:
Hybridoma technology is used to commercially production of monoclonal antibodies. The monoclonal antibodies are protective protein produced by the clone of single immune cell.
9. Which of the following is studied in Ethnobotany?
[A] Practical use of plants by local culture and people
[B] Relations between Plants and peoples Behvaior
[C] Comparison of different plants in a particular area
[D] Study of relations of plants, animals and animals in an area
Show Answer
Correct Answer: A [Practical use of plants by local culture and people]
Notes:
Ethnobotany is the study of the plants of an area and their practical uses through the traditional knowledge of a local culture and people.
10. 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.
