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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper I, General Studies · Q7 of 120

Geo-Scientist Prelims 2020 General Studies Q7: Heliophile plants require mean maximum illumination of:

QuestionEcology / light and plants

Heliophile plants require mean maximum illumination of:

  1. (a) 30,000 lux.
  2. (b) 20,000 lux.
  3. (c) 10,000 lux.
  4. (d) 40,000 lux.

Answer: (b) 20,000 lux.

Heliophytes (sun-loving plants) need high light; the mean maximum illumination quoted for them in ecology texts is about 20,000 lux, while sciophytes (shade plants) need far less. Answer as per the official key.

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