26: Plants take nitrogen in the form of:
(a) Nitrites
(b) Ammonia
(c) Nitrates
(d) Element
27: Consider the following statements regarding bones in the human body :
1. They consist of 80% solid matter and 20% water.
2. Solid matter in the bones is made mainly of cartilage.
3. Impregnation of salts including carbonates and phosphates of lime imparts hardness to the bones.
4. In old age, the proportion of lime decreases and bones become brittle and break easily.
Of these statements :
(a) 1, 2 and 3 are correct
(b) 2 and 4 are correct
(c) 2 and 3 are correct
(d) 1, 2, 3 and 4 are correct
28: Sucrose content in sugarcane decreases
(a) if high rainfall occurs during the period of growth of the plant
(b) if frost occurs during the period of ripening
(c) if there is fluctuation in temperature during the period of growth of the plant
(d) if there is high temperature during the time of ripening
29: When the rice is boiled, it expands because:
(a) The starch gelatinises and swells
(b) The starch gets polymerised
(c) The grains absorb moisture and swell
(d) Sugars break down in the grains
30: Which one of the following is a man made cereal NOT found in nature?
(a) Dwarf wheat
(b) Hybrid maize
(c) Triticale
(d) Soya bean