• Answer the following questions as directed :
17. Which is the largest and important part of human brain?
18. What are acquired characteristics (traits)?
19. For what purpose is the study of fossils important?
20. Write Ohn's law
21. Give names of two metals useful to make solar cell panel.
22. What is ozone hole?
23. Why was the Ganga Action Plan launched?
24. Match the given pair properly:
Group A (Gland)
a. Adrenal
Group B (Location)
1. In throat
he kidney
Answers
Answer:
17. Cerebrum
18. An acquired characteristic is a non-heritable change in a function or structure of a living organism caused after birth by disease, injury, accident, deliberate modification, variation, repeated use, disuse, misuse, or other environmental influence. Acquired traits are synonymous with acquired characteristics
19. Studying fossils helps them learn about when and how different species lived millions of years ago. Sometimes,fossils tell scientists how the Earth has changed.
20. Ohm's Law and Resistance. Ohm's lawstates that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and directly proportional to the resistance of the circuit. The formula for Ohm's law is V=IR.
21.Answer. The two materials used formaking solar cells are silicon and Cadmium Telluride. EXPLANATION: The 'solar cell' also known as 'photovoltaic cell' has the capability of converting 'light energy' into electricity.
22.Ozone holes can be termed as thedepletion of the ozone layer which is present in the upper atmosphere i.e. stratosphere at the polar region of earth. ... Ozone present in the stratosphere is formed by the sun's ultraviolet radiation on oxygen molecules.
23. Ganga Action Plan was launched by Rajiv Gandhi in India on January 14, 1986. The main aim of this plan was to protect the river Ganga from further more pollution. It was launched to improve the quality of water treatment of the sewage, interception and other methods, also to prevent the mixing of the industrial wastes.
24.
Answer:
Hii friend
Explanation: