vi) What are the sources of food?
vii) Name one opaque substance
vii) Define condensation
ix) What are hard materials?
x) What type of soil is used to grow cotto
Answers
Answer:
vi)Plants and animals are the main source of food for all the organisms on earth. Food obtained from animals is the main source of protein and include fish, milk, meat, poultry, and cheese. Whereas plants provide us with fruits and vegetables, which are an important source of fibres, proteins and carbohydrates.
vii)Opaque objects block light from traveling through them. Most of the light is either reflected by the object or absorbed and converted to thermal energy. Materials such as wood, stone, and metals are opaque to visible light
viii)Condensation is the process where water vapor becomes liquid. It is the reverse of evaporation, where liquid water becomes a vapor. Condensation happens one of two ways: Either the air is cooled to its dew point or it becomes so saturated with water vapor that it cannot hold any more water.
ix)Hard materials are often also very brittle - this means they have a low resistance to impact . Well known hard materials include diamond and hardened high carbon steels. Same units as for tensile strength.
x)Cotton plants tend to do well in deep, well-drained, and highly fertile sandy loam soils with a pH between 5.5 and 7.5—cotton plants are vulnerable to the aluminum concentration often found in soils with a pH below that range.
Answer:
1. plants and animals are the main sources of the food .
2. concrete , wood are some examples of opaque substance .
3. water which collects as droplets on a cold surface when humid air is in contact with it.
4. materials that can not be compressed or scratched easily are called hard. Examples are steel, iron, etc.
5. black soil is used to grow cotton plants.
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