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UPSC 1999: For which one of the following is capillarity not the only reason?
(a)Blotting of ink
(b)Rising of underground water
(c)Spread of water drop on a cotton cloth
(d)Rising of water from the roots of a plant to its foliage
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Not attemptedCorrect Answer: (b) Rising of underground water
Blotting of ink, the spreading of a water drop in cotton, and upward movement of sap in fine xylem vessels are classic results of capillary rise. The general rise of underground (ground-water) levels, however, is governed mainly by hydrostatic pressure gradients, permeability and recharge, with capillarity playing only a subordinate role; hence capillarity is not the sole cause in this case. ([edurev.in](https://edurev.in/t/203049/Physics-Solved-Questions--1995-2020--2))
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Frequently Asked Questions
What is the correct answer to this UPSC 1999 Science & Technology question?▼
The correct answer is option (b): Rising of underground water. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1999, GS Paper 1, as Question 115. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Biology?▼
UPSC has asked 97 questions from Biology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.