Which of the following is a non-renewable energy resource?
A. Tidal energy
B. Coal
C. Wind energy
D. Solar energy
Answer: Option B
Solution (By JKExamLibrary)
Coal is a fossil fuel formed over millions of years and is finite, thus non-renewable. Solar, wind, and tidal energy are renewable and replenishable. Non-renewable resources include coal, petroleum, natural gas, and nuclear minerals. Overexploitation leads to depletion and environmental pollution. Conservation of such resources is essential for sustainable development.
Consider statements about scientists: 1. Robert Hooke discovered the cell. 2. Louis Pasteur disproved spontaneous generation. 3. Alexander Fleming discovered the structure of DNA. Which are correct?
Explanation:
Robert Hooke first observed and coined the term 'cell' in 1665 using cork tissue. Louis Pasteur definitively disproved the theory of spontaneous generation using his swan-neck flask experiment. Alexander Fleming discovered the antibiotic penicillin, not the structure of DNA; that was elucidated by Watson and Crick. Thus, statements 1 and 2 are correct.
Explanation:
Birds (Aves) and mammals (Mammalia) are endothermic (warm-blooded) and possess a four-chambered heart, allowing complete separation of oxygenated and deoxygenated blood. Amphibians have a three-chambered heart, reptiles mostly three-chambered (except crocodilians), fish two-chambered. This allows high metabolic rates.
Explanation:
Epilepsy is a neurological disorder marked by recurrent seizures caused by excessive and synchronous neuronal firing. Stroke is from interrupted blood supply, MS is demyelination, meningitis is inflammation of meninges.
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