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Some species of plants are insectivorous. Why? [UPSC 2010 (CS-P)]

Their growth in shady and dark places does not allow them to undertake sufficient photosynthesis and thus they depend on insects for nutrition.
They are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition.
They can not synthesize certain vitamins themselves and depend on the insects digested by them.
They have remained in that particular stage of evolution as living fossils, a link between autotrophs and heterotrophs.

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UPSC Other Question

Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when:
1. The orbit is geosynchronous.
2. The orbit is circular.
3. The orbit lies in the plane of the Earth’s equator.
4. The orbit is at an altitude of 22,236 km.
Select the correct answer using the codes given below: [UPSC 2011 (CS-P)]

1, 2 and 3 only
1, 3 and 4 only
2 and 4 only
1, 2, 3 and 4 he “Red Data Books” published by the International Union for Conservation of Nature and Natural Resource (IUCN) contain lists of
1. Endemic plant and animal species present in the biodiversity hotspots.
2. Threatened plant and animal species.
3. Protected sites for conservation of nature and natural resources in various countries.
Select the correct answer using the codes given below: [UPSC 2011 (CS-P)]

1 and 3
2 only
2 and 3
3 only