275. The tree requiring minimum water for its growth is:
     (a) Babul
     (b) Eucalyptus
     (c) Mango
     (d) Guava
Ans: (a)
276. Regarding the carrot, it is true to say that:
     (a) main root is modified for food storage
     (b) main stem is modified for food storage
     (c) stem and root store food
     (d) root hairs are modified to hold soil
Ans: (a)
277. The fruit formed without fertilisation is known as: [CDS 1992]
     (a) amitosis
     (b) parthenogenesis
     (c) oogenesis
     (d) parthenocarpy
Ans: (d)
278. Plant hormone that induces cell division is: [CDS1992]
     (a) auxins
     (b) gibberellins
     (c) dormins
     (d) kinnins
Ans: (a)
279. The scientist who explained about blood circulation for the first time :
     (a) Antonyvan Leewen Hock
     (b) William Harvey
     (c) Gregor Mendel
     (d) Ronald Ross
Ans: (b)
280. Put in chronological order:
          1) Mendel"s laws of inheritance.
          2) Darwin"s theory of evolution.
          3) Blood circulation theory by Harvey.
          4) DeVrie"s theory of mutation.
     (a) 3, 2, 1, 4
     (b) 1, 2, 3, 4
     (c) 2, 1, 3, 4
     (d) 3, 2, 4, 1
Ans: (a)
281. An adult human being has 16 teeth on each jaw. In each half of the jaws, there are:
     1) Three molars
     2) Two incisors
     3) Two premolars
     4) One canine