Question

In a class test containing 10 questions, 4 marks are given for every correct answer, (-2) are given for every incorrect answer and (-1) is given for every question for not attempting. Gagan attempted only 9 questions and out of 9, 7 were correct. Choose the correct option to identify a correct score. *

1 point

7 × (4) + 2 × (-2) + 1 × (-1)

7 × (4) - 2 × (-2) + 1 × (-1)

7 × (4) + 2 × (-2) + (-1) × (-1)

None of these​

Answer 1

Answer:

Destroys life in the water based ecosystem which is polluted which in turn disrupts natural food chain. Aquatic life is destroyed due to the non-biodegradable pesticides and chemicals. Water pollution affects the microbial population. There is a steep increase in the BOD levels of water.

Step-by-step explanation:

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