Physical and Chemical Changes — Science STD 7 — Question

A virtual image larger than the object can be produced by a

An 11-year-old girl is experiencing pain and discomfort in her lower abdomen every month for a few days. What natural process is most likely responsible, and what should be encouraged during this period?

Which experiment proves that sunlight is necessary for photosynthesis?

Which of the following does not express a time interval?

The reaction given below is a:
Copper sulphate+Iron→Iron sulphate+Copper

The weather reports use thermometer to measure the:

Of the four distinct layers or sections of soil profile, organic matter is found in:

Radiation is passing through a transparent medium, then:

A scientist tests a soil sample from a uncultivated field and concludes that the soil is highly basic in nature. She suggests that adding organic matter in the soil could improve the quality of the soil. How does organic matter improve the quality of the soil?

When is the 'World Water Day' celebrated every year?