Why Do we Fall Ill — Science STD 9 — Question

Give an example of Gram-negative eubacteria.

What is a colloid? Give two examples of colloids (or colloidal solutions).

Which one of the following crops require a minimum quantity of NPK or urea for its proper growth paddy, peas, wheat, sugarcane.

Give one example of an Indian and foreign poultry breed which when crossed produce an improved variety. List any one desirable trait expected from such cross breeding.

Write down the names of animal products which are used as food.

Two balls of the same size of different materials, rubber and iron are kept on the smooth floow of a moving train.The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for yours answer.