BIOLOGY CH21 Nutrition and Health — Science STD 9 — Question

Numerical problem.

A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. Calculate the number of seconds for the splash to be heard? (Given g = 10 m s^–2 and speed of sound = 340 m s^–1)

The primary coil of a transformer has 800 turns and the secondary coil has 8 turns. It is connected to a 220 V ac supply. What will be the output voltage?

An organism A which cannot move from one place to another makes a simple food B from the substances C and D available in the environment. This food is made in the presence of green coloured substance E present in organs F in the presence of light energy in a process called G. Some of the simple food B also gets converted into a complex food H for storage purposes. This food gives blue-black colour with iodine solution?

Arun and Akash were given fertilisers and earthworm compost both to be used in the fields. Akash preferred to use earthworm compost. Why did not select the fertilizers?

Define Relative Density.

Write the salient features of the compound epithelium.

Define the critical angle.

Differentiate

Kwashiorkar from Marasmus

Write about comets.

How is the small intestine designed to absorb digested food?