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Force And Laws Of Motion
How do biotic and abiotic factors affect crop production?
Biotic factors such as pests, insects and diseases reduce the crop production. These adverse effect on the plants and thus decrease the production. A pest causes damage to our crops by feeding. Weeds also reduce crop productivity by competing with the main crop for nutrients and light.
Similarly, abiotic factors such as temperature, wind, rain, drought, salinity etc. affect the net crop production. For example droughts and floods have a great impact on crops sometimes, destroying the entire crop. Salinity can lead to the death of crops if they are not resistant to it.
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What do you mean by health?
‘Public cleanliness is important for individual health’ comment.
Why good economic conditions and gibes are needed for individual health?
How can one be in poor health without actually suffering from a particular disease? Give an example.
Give two examples of how health of a person can depend on his environment.
What we commonly mean by community?
How does personal health relate to community health?
Can you stay well if your home is clean but your neighbourhood is not, why?
State any two conditions essential for good health.
State any two conditions essential for being free of disease.
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