(a) They activate the enzymes necessary for vitamin synthesis in the body and help in order to prevent the
          vitamin deficiency
      (b) They prevent excessive oxidation of carbohydrates, fats and proteins in the body and help in order to avoid
          the unnecessary wastage of energy
      (c) They neutralize the free radicals produced in the body during metabolism
      (d) They activate certain genes in the cells of the body and help in delay the ageing process
Ans: (a)
8.  Biodiversity forms the bases for human existence in the following ways: [CSAT-IAS2011]
      1) Soil formation
      2) Prevention of soil erosion
      3) Recycling of waste
      4) Pollination of crops
      Select the correct answer using the codes given below;
      (a) 1,2 and 3 only
      (b) 2,3 and 4 only
      (c) 1 and 4 only
      (d) 1,2,3 and 4
Ans: (b)
9.  The study of Annual rings is called:
      (a) dendrology
      (b) dendrochronology
      (c) agronomy
      (d) horticulture
Ans: (b)
10. The study of fruits is called:
      (a) spermology
      (b) anthology
      (c) pedology
      (d) pomology
Ans: (d)
11. The study of internal structure of the plants is called:
      (a) morphology
      (b) taxonomy
      (c) anatomy
      (d) histology
Ans: (c)
12. If excess fertilizer is applied to a plant without water, the plant will [CDS 2010]
      (a) be stunted in growth
      (b) develop modifications
      (c) die due to plasmolysis
      (d) remain unaffected
Ans: (c)
13. Tips of leaves in grasses and common garden plants show water drops in early morning hours. This water
    accumulation is obtained from [CDS 2010]
      (a) atmosphere
      (b) stomata
      (c) vascular bundles
      (d) hydathodes
Ans: (b)