In India, cluster bean (Guar) is traditionally used as a vegetable or animal feed, but recently the cultivation of this has assumed significance. Which one of the following statements is correct in this context?
- (a) The oil extracted from seeds is used in the manufacture of biodegradable plastics
- (b) The gum made from its seeds is used in the extraction of shale gas ✓ UPSC's answer
- (c) The leaf extract of this plant has the properties of anti-histamines
- (d) It is a source of high quality biodiesel
Why the answer is (b)
• Guar gum, extracted from the seeds of cluster bean, is a thickening agent used in hydraulic fracturing fluid to carry sand into shale rock fractures; the US shale boom sent guar prices soaring around 2012, making Rajasthan farmers rich — option (b).
• Guar is not used for bioplastics (a), antihistamines (c) or biodiesel (d).
• India produces about 80% of the world's guar.
• Hence option (b).
Why the other options are wrong
- (a) The oil extracted from seeds is used in the manufacture of biodegradable plastics
- Guar is not a bioplastic source.
- (c) The leaf extract of this plant has the properties of anti-histamines
- Guar has no antihistamine use.
- (d) It is a source of high quality biodiesel
- Guar is not a biodiesel source.
Asked in the GS Paper I of the UPSC Civil Services Preliminary Examination 2014, held on 24 August 2014. Question and answer key: Union Public Service Commission. Explanation: UPSC Answer Check.