all question ans properly A. QUESTION 1,2,3 B.1,2,3,3,5,6,7

OBJECTIVE TYPE QUESTIONS A. Each of the following questions comprises four alternatives. Select the most appropriate answer for each. 1. Ecosystems (a) are independent units (b) have separate nutrient supplies (c) have self-purification system (d) have one group of organisms 2. Population growth is predicted by (a) gradual increasing trends upto a certain level (b) exponential increase in a given time period (c) logistic pattern (d) all the above 3. Which of the following produces negative effect on each other? (a) Antagonism (b) Parasitism (c) Competition (d) Predation B. Fill in the blanks with suitable words: 1. Living and non-living entities co-exist in the environment because 2. Organisms live and interact in a specific living space known as 3. Species diversity is more prominent in type of forests. 4. In terrestrial biomes, supplies nutrients. 5. Diverse situations exist in the world because 6. A sink for CO2 is 7. Nitrogen fixation means