Question

Rita carried out an experiment, she took two transparent plastic jars and labeled them as Jar 1 and Jar 2. In Jar 1 she placed a cockroach, pieces of bread and water. In Jar 2 she placed a cockroach, pieces of bread but no water. She then covered both the jars with a mosquito net. What will be her observations after a few days?

• A. The cockroach of Jar 1 remains normal.
• B. The cockroach of Jar 2 remains normal.
• C. The cockroach of Jar 1 will die.
• D. The cockroach of Jar 2 will die.

Answer 1

Answer: (A), (D)

The correct options are
A

The cockroach of Jar 1 remains normal.

D

The cockroach of Jar 2 will die.

The cockroach of Jar 1 remains normal as both water and food have been given to it. After two or three days, the cockroach of Jar 2 will become fatigued and will die.This experiment shows that animals cannot live long without water. Water is essential for the life of animals.