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Explanation:
16. They are beneficial in our environment because they help in protecting the damage of environment from chemicals such as pesticides and fertilizers i.e recycling biological wastes etc..
17. a) Roughage :- They are rich in fibre. ex:- cowpea ,berseem.
b) Concentrates :- These are nutrient-rich and low in fibre. ex:- oats, maize etc...
18. Gases are compressible because in gases the molecular force of attraction between particles is negligible and the intermolecular spaces are negligible.
19. Mass of sodium chloride (solute) = 36 g
Mass of water (solvent) = 100g
Mass of solution = 36+100 = 136g
Concentration = (Mass of solute/ Mass of solution ) * 100
Concentration = 36/136 * 100
Concentration = 26.47%
If temperature increases, solubility decreases and if solubility increases, temperature decreases .
It is possible to distinguish the particles of solute from those of solvent in a suspension, since a particle size is bigger in suspension
Hence it is easier to distinguish the particles of solute.
20. The displacement of a moving object given in a given time of interval is zero. Then the distance travelled by the object will also be zero.