sustainable management of natrual resources — Science STD 10 — Question

You were visiting your friend's house. You observed some indoor plants in drawing room. You noticed that shoots of all plants slightly moved towards open window. Aunty told you that she had often changed the position of the arrangement of plants. But in any position shoots of plants showed same behaviour.
(1) Which movements are shown by plants?
(2) Which hormone is responsible for such movement in plant?
(3) How such hormone is functioning in plant body?
(4) Which arrangement do you suggest for plants to show straight growth of shoot?

Atul built a small house. He used well-insulated copper wires of good quality for wiring and switches, sockets and plugs too. He however, had a room-heater of poor quality. Once on a winter night he was sleeping with his family in a closed room with the heater ON. During sleep he was suffocated. Hence he woke up and found flames of heater on fire. His son Raghav got up quickly and switched off the main switch. He made a call to the fire brigade. The fire crew of fire brigade reached quickly and put off fire. Atul and his family thanked the firemen.
(1) How Atul's heater was on fire?
(2) Name the safety device missing in the electric wiring of Atul's house.
(3) What values do you learn from Raghav in this episode?

What are the factors on which the force acting on a given current-carrying conductor placed in a magnetic field depend? State when is the magnitude of force highest.

What requirements are essential for terrestrial animals for exchange of respiratory gases?

Using an example of electric bulb, explain how electric heating is used to produce light.

Explain about refractive index in detail.

State the properties of carbon compounds.

Will current can flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?

Give scientific reason:
Respiration is important to keep the organism in living state.