Life Processes in Animals — Science STD 7 — Question

Respiration is a continous process. What is the need for it to be continuous rather than being like photosynthesis?

If a pan is removed from the fire, then why does it cool down?

Name one emotional change seen during adolescence.

Urine is called an excretory product. Why?

Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.

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?

You are provided with three iron nails, each dipped in oil, water and vinegar. Which iron nail will not rust, and why?

Fill in the blanks:Seed dispersal takes place by means of _____________, _____________ and _____________.

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

What are the benefits of residing in nearby forest area?