The Ever-Evolving World of Science — Science STD 7 — Question

Paheli thought that new plants always grow from seeds. But, she has never seen the seeds of sugarcane, potato and rose. She wants to know how these plants reproduce?

Name the respiratory organ of frogs.

What is the function of an odometer?

Write the difference in the composition of inhaled and exhaled air.

Define time period of a pendulum.

What is the function of guard cells of stomata?

In an experiment, Ria exhale into a glass containing lime water. What changes would be observed by Ria?

What are the important components required for the production of glucose in plants?

Name the living organism that helps in maintaining the supply of nutrients to the growing plants in the forest.

Which type of lens forms always a virtual image?