Consider statements about ecology: 1. A food chain shows the flow of energy. 2. A food web shows interconnected food chains. 3. Decomposers are the primary producers. Which are correct? MCQ with Answer and Explanation
Consider statements about ecology: 1. A food chain shows the flow of energy. 2. A food web shows interconnected food chains. 3. Decomposers are the primary producers. Which are correct?
A. 1, 2 and 3
B. 1 and 2 only
C. 1 and 3 only
D. 2 and 3 only
Answer: Option B
Solution (By JKSSB Mock Tests)
A food chain is a linear sequence showing the transfer of energy and matter from one organism to another through consumption. A food web is a complex, interconnected network of multiple food chains, representing the realistic feeding relationships in an ecosystem. Decomposers (bacteria and fungi) are saprotrophs that break down dead organic matter; primary producers are autotrophs (plants, algae) that synthesize their own food. Thus, statements 1 and 2 are correct.
Explanation:
Vitamin D (cholecalciferol) is unique as it can be synthesized in the skin from 7-dehydrocholesterol in the presence of UV-B radiation. It acts as a hormone to regulate calcium and phosphate homeostasis. It must be activated in the liver and kidneys. It is also obtained from dietary sources like fatty fish, egg yolk. Deficiency causes rickets/osteomalacia.
Consider the following statements about blood:
1. Red blood cells transport oxygen.
2. White blood cells are involved in immunity.
3. Platelets help in blood clotting.
Which of the above is/are correct?
Explanation:
All three statements are correct: RBCs contain hemoglobin for oxygen transport, WBCs (leukocytes) defend against pathogens, and platelets (thrombocytes) initiate blood clotting.
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