Consider the following statements about the circulatory system of insects: 1. It is an open circulatory system. 2. Hemolymph is the circulating fluid. 3. Blood is contained in vessels at all times. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about the circulatory system of insects:
1. It is an open circulatory system.
2. Hemolymph is the circulating fluid.
3. Blood is contained in vessels at all times.
Which of the above is/are correct?
A. 2 and 3 only
B. 1 and 2 only
C. 1, 2, and 3
D. 1 and 3 only
Answer: Option B
Solution (By JKExamLibrary)
Insects have an open circulatory system where hemolymph bathes organs directly, not always in vessels. Thus, 3 is incorrect.
Explanation:
ADH (vasopressin) increases water permeability of the collecting duct cells by inserting aquaporins, reducing urine volume. Aldosterone increases sodium reabsorption, renin is an enzyme, ANP promotes sodium excretion.
Explanation:
Hugo de Vries proposed the mutation theory in 1901 based on his experiments with evening primrose (Oenothera lamarckiana), suggesting that new species arise suddenly through large mutations. Darwin proposed gradual natural selection, Lamarck use-disuse, Wallace independently natural selection.
Explanation:
Chloroplasts contain chlorophyll and thylakoids, where light reactions occur, and stroma for the Calvin cycle. They convert light energy to chemical energy.
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