Plant: Economic Importance

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Q10. According to Rajasthan’s 2016–17 agricultural statistics, which is the correct descending production order of wheat, bajra, maize and rice?

[RPSC Senior Teacher Grade II — 2019]

1. Wheat, maize, rice, bajra
2. Wheat, rice, maize, bajra
3. Wheat, bajra, maize, rice
4. Wheat, maize, bajra, rice

Answer: (C) Wheat, bajra, maize, rice

Explanation: In the specified 2016–17 statistical reference, wheat ranked ahead of bajra, followed by maize and rice. Rajasthan grows substantial wheat under irrigation and bajra in drier environments. The answer is tied specifically to that reporting year.

Q9. Most of India’s jute factories have historically been situated in which state?

[RPF Constable 2018 paper — 2018]

1. Andhra Pradesh
2. Bihar
3. Assam
4. West Bengal

Answer: (D) West Bengal

Explanation: West Bengal became the centre of India’s jute manufacturing sector, especially along the Hooghly. Proximity to fibre-growing regions, transport, water and Kolkata’s port stimulated development. The mills turn plant bast fibre into packaging and textile materials.

Q8. Match the plant products to their chief sources: opium, hing, rubber and quinine. Which pairing is correct?

[UPPSC Civil Service Prelims (2017) — 2017]

1. Opium—bark; hing—root; rubber—fruit; quinine—stem
2. Opium—fruit; hing—root; rubber—stem; quinine—bark
3. Opium—stem; hing—root; rubber—bark; quinine—fruit
4. Opium—root; hing—stem; rubber—fruit; quinine—bark

Answer: (B) Opium—fruit; hing—root; rubber—stem; quinine—bark

Explanation: Opium is collected from the latex of unripe poppy capsules, hing from Ferula root exudates, rubber from stem latex and quinine from cinchona bark. These examples show how different plant organs yield economically valuable secondary products.

Q7. Which listed region is not known primarily for cotton-textile manufacturing?

[UPSC NDA GAT — 2017]

1. Mumbai–Pune
2. Madurai–Coimbatore
3. Dhanbad–Jamshedpur
4. Indore–Ujjain

Answer: (C) Dhanbad–Jamshedpur

Explanation: Dhanbad–Jamshedpur is especially associated with coal mining, iron and steel and heavy industries. The other regions have established cotton-textile activity. Industrial locations reflect access to raw cotton, workers, infrastructure, markets and historical investment.

Q6. The alkaloid caffeine occurs naturally in which beverages?

[UPPSC Civil Service Prelims (2016) — 2016]

1. Only tea
2. Only coffee
3. Both tea and coffee
4. Only lemon water

Answer: (C) Both tea and coffee

Explanation: Caffeine is a naturally occurring stimulant found in both tea leaves and coffee seeds. It affects alertness through the central nervous system. Concentrations vary with species, preparation and serving size, contributing to the commercial appeal of these beverages.

Q5. Which one is best classified as a cash crop among these?

[RPSC AEn DLB Civil (2016) — 2016]

1. Barley
2. Wheat
3. Tea
4. Rice

Answer: (C) Tea

Explanation: Tea is typically cultivated as a commercial plantation crop and processed for sale in domestic and export markets. Barley, wheat and rice are primarily food grains. The distinction describes the crop’s main economic purpose rather than whether it is edible.

Q4. Arrange these cotton-industry innovations from earliest to latest: spinning jenny, flying shuttle, spinning mule, water frame.

[UPSC NDA GAT — 2015]

1. Spinning jenny, spinning mule, water frame, flying shuttle
2. Flying shuttle, spinning jenny, water frame, spinning mule
3. Water frame, spinning jenny, spinning mule, flying shuttle
4. Flying shuttle, water frame, spinning jenny, spinning mule

Answer: (B) Flying shuttle, spinning jenny, water frame, spinning mule

Explanation: John Kay’s flying shuttle preceded James Hargreaves’s spinning jenny, Richard Arkwright’s water frame and Samuel Crompton’s spinning mule. These mechanisations accelerated yarn and cloth production, transforming the economic value and processing scale of raw cotton.

Q3. Which state was the leading producer of natural rubber in India among these choices?

[UPPSC Assistant Engineer General Studies (2013) — 2013]

1. Kerala
2. Karnataka
3. Tamil Nadu
4. Telangana

Answer: (A) Kerala

Explanation: Kerala has historically been India’s largest natural-rubber producing state. High rainfall, warmth and suitable plantation conditions favour rubber trees. Latex processing supports tyres and numerous other industries. Production rankings vary over time and the examination refers to its historical context.

Q2. Which of these high-yielding crop varieties are varieties of wheat: 1. Arjun, 2. Jaya, 3. Padma, 4. Sonalika?

[UPSC CSE Prelims GS-I (2002) — 2002]

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 4 only
4. 3 and 4 only

Answer: (C) 1 and 4 only

Explanation: Arjun and Sonalika are wheat varieties, while Jaya and Padma are associated with rice. Identifying high-yielding varieties is important in crop improvement and Green Revolution history. A variety name must be associated with its correct cereal species.

Q1. Which of the following can be propagated by stem cuttings: Bougainvillea, carnations, cocoa and grapes?

[UPSC CSE Prelims GS-I (2002) — 2002]

1. Bougainvillea and carnations only
2. Carnations, cocoa and grapes only
3. Bougainvillea, cocoa and grapes only
4. All four

Answer: (D) All four

Explanation: Stem cuttings can develop adventitious roots and produce new plants from vegetative tissues. Bougainvillea, carnations, cocoa and grapes can be propagated using appropriate cutting methods. Vegetative multiplication helps growers preserve desirable characteristics of commercially useful varieties.