Question 4

Open drain system is a breeding place for which of the following?
(a) Flies
(b) Mosquitoes
(c) Organisms which cause diseases
(d) All of these

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Solution

The answer is option (d).

Open drain system is a breeding place for flies, mosquitoes and organisms which cause diseases. The wastewater from sinks, toilets, laundries, showers goes down to the drains. The sight of an open drain is disgusting. The situation worsens in the rainy season when the drains start overflowing. So, it is better to keep the drains closed. Thus, it prevents the breeding of disease causing organisms.

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An open drain system is not a breeding place for which of the following?

Q. A huge pile of garbage gets degraded day by day. The decayed wastes would also become a breeding ground for various insects, flies, and mosquitoes. This causes many diseases. Identify the diseases caused by decayed waste.

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Question 15
We should not allow mosquitoes to breed in our surroundings because they

(a) multiply very fast and cause pollution
(b) are vectors for many diseases
(c) bite and cause skin diseases
(d) are not important insects

(a) How do mosquitoes carry disease-causing micro-organisms and spread diseases ?

(b) Mention any three ways of preventing diseases spread by mosquitoes.

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Sewage Systems

Standard VII Chemistry

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Question 4 Open drain system is a breeding place for which of the following? (a) Flies (b) Mosquitoes (c) Organisms which cause diseases (d) All of these

Question 4

Open drain system is a breeding place for which of the following?
(a) Flies
(b) Mosquitoes
(c) Organisms which cause diseases
(d) All of these