Wastewater Story — Science STD 7 — Question

RBC contains a red coloured pigment which carries oxygen with it. What is the pigment called?

Fill in the blank with suitable word. Diaphragm forms the __________ of the chest cavity.

Name the acid present in sting of an ant.

The vocal ability of humans is the responsibility of an organ commonly known as voice box. What is its scientific name?

A burning incense stick is fixed, pointing downwards. In which direction would the smoke from the incense stick move? Show the movement of smoke with a diagram.

Define humus.

Explain the reason for serving of tea in China clay cup and plates.

Give names of any four birds which you expect to see in a forest.

When we add some dry soil to the water in a glass and stir it, bubbles are observed from the soil. What causes these bubbles to raise?

Name two inorganic impurities present in sewage.