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2321. Which of the following provides the best estimate of the worlds biological diversity ?
A. Of about 10 million species probably alive today, some 20 species are lost everyday, most of them unknown because no more than half a million have yet been actually identified by scientists.
B. Of about 30 million living species, some 50 are lost everday, most of them unknown because no more than one million have been actually identified.
C. Of about 45 million living species, some 100 are lost everday, most of them unknown because no more than 1.5 million have been actually identified.
D. Of about 75 million living species, some 500 are lost everday, most of them unknown because no more than 3 million have been actually identified.
Explanation:
2322. Which of the following gases is not found free in air ?
A. Nitrogen
B. Hydrogen
C. Oxygen
D. Carbon dioxide
Explanation:
2323. Chromosomes are
A. present only in the nucleus of a cell
B. the biggest in number in human cells
C. made up of DNA as a main component
D. visible in all cells at every time
Explanation:
2324. If safe storage is to be ensured, the moisture content of food grains at the time of harvesting should not be higher than
A. 14%
B. 16%
C. 18%
D. 20%
Explanation:
2325. Which of the following animals resembles most to human beings in terms of physical and mental capabilities ?
A. Langur
B. Rhesus monkey
C. Gorilla
D. Chimpanzee
Explanation:
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