Consider statements about ecology: 1. A food chain shows a single pathway of energy flow. 2. A food web shows multiple interconnected pathways. 3. Energy is recycled in an ecosystem. Which are correct? MCQ with Answer and Explanation
Consider statements about ecology: 1. A food chain shows a single pathway of energy flow. 2. A food web shows multiple interconnected pathways. 3. Energy is recycled in an ecosystem. Which are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2 and 3
Answer: Option B
Solution (By JKExamLibrary)
A food chain is a linear, simplified sequence showing the transfer of energy and matter from one organism to another through consumption. A food web is a more realistic, complex network of interconnected food chains, illustrating the multiple feeding relationships and pathways of energy flow in an ecosystem. While nutrients (matter) are continuously recycled in an ecosystem through biogeochemical cycles, energy flows unidirectionally and is eventually lost as heat; it is not recycled. Thus, statements 1 and 2 are correct.
Consider statements about animal husbandry: 1. Silkworms feed on mulberry leaves. 2. Honeybees communicate through the waggle dance. 3. Fish farming is called sericulture. Which are correct?
Explanation:
The domesticated silkworm, Bombyx mori, is a monophagous insect that feeds exclusively on the leaves of the mulberry plant (Morus alba). Honeybees perform a 'waggle dance' on the honeycomb to communicate the direction and distance of food sources to other worker bees. Fish farming is called pisciculture or aquaculture; sericulture specifically refers to the rearing of silkworms for silk production. Thus, statements 1 and 2 are correct.
Consider the following statements about the skin:
1. The epidermis is the outermost layer.
2. Melanin protects against UV radiation.
3. Sebaceous glands produce sweat.
Which of the above is/are correct?
Explanation:
The anther is the terminal part of the stamen (male reproductive organ) where pollen grains are produced through microsporogenesis. Stigma is the receptive surface for pollen, style connects stigma to ovary. Ovary contains ovules, which develop into seeds after fertilization. The anther has four microsporangia (pollen sacs).
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