Nutrition in Animals — Science STD 7 — Question

Name the most ancient unit of time in which it was earlier measured.

Deforestation can increase the earth’s temperature. Is it true? Give reason.

Do not add to the load of WWTP. Paheli wonders how?

State one property of bases.

One day Sachin had gone to his uncle who lives in a village. He saw there a large number of people defecate in an open area because proper toilet facilities are not there. He wondered about the groundwater contamination, as he studied in his class that this act may cause water-borne diseases. He convinced village people to make toilets in order to avoid such an out break of water-borne diseases.
(i) Name two water-borne diseases.
(ii) What values are shown by Sachin?

Explain the term humus that is generally found in the uppermost layer of soil.

What is the function of haemoglobin?

What surprising thing happened with Ashwin and Keerthi at the science fair?

Urinary bladder is the part of human excretory system. What is its role in excretion?

Give an example to show the transfer from heat from one body to another.