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Q19 (IAS/2024) Environment & Ecology › Biodiversity & Protected Areas › Economic plant resources Official Key

Consider the following plants : 1. Groundnut 2. Horse-gram 3. Soybean How many of the above belong to the pea family ?

Result
Your answer: —  ·  Correct: C
Explanation

The correct answer is option C - all three plants belong to the pea family (Fabaceae/Leguminosae).

Groundnut is a leguminous crop which adds valuable nitrogen to the soil[1], confirming its membership in the pea family. Horse-gram is listed among pulses[2], and pulses are major source of protein in Indian diet[2]. Pulses, by definition, are edible seeds of leguminous plants belonging to the Fabaceae family. Soybean is also a well-known legume and pulse crop that belongs to the pea family.

All leguminous crops share the characteristic ability to fix atmospheric nitrogen through root nodules containing symbiotic bacteria, which is why groundnut is often grown in rotation with other crops like millets, maize or cotton[1] to enrich soil fertility. Therefore, all three plants - groundnut, horse-gram, and soybean - are members of the pea family (Fabaceae).

Sources
  1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 12: Major Crops and Cropping Patterns in India > Groundnuts or Peanut (Arachis hypogoea) and Groundnut (Arachis hypogaea) > p. 33
  2. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 25: Agriculture > Pulses or Grain Legumes > p. 353
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Don’t just practise – reverse-engineer the question. This panel shows where this PYQ came from (books / web), how the examiner broke it into hidden statements, and which nearby micro-concepts you were supposed to learn from it. Treat it like an autopsy of the question: what might have triggered it, which exact lines in the book matter, and what linked ideas you should carry forward to future questions.
Q. Consider the following plants : 1. Groundnut 2. Horse-gram 3. Soybean How many of the above belong to the pea family ? [A] Only one …
At a glance
Origin: From standard books Fairness: High fairness Books / CA: 10/10 · 0/10
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This is a 'Sitter' derived directly from NCERT Geography and basic Environment texts. It tests the fundamental definition of 'Leguminous Crops' (Nitrogen fixers). If you know which crops restore soil fertility, you know the answer.

How this question is built

This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.

Statement 1
Which of these plants—groundnut (Arachis hypogaea), horse-gram (Macrotyloma uniflorum), and soybean (Glycine max)—are members of the pea family (Fabaceae)? List them and give the total count.
Origin: Direct from books Fairness: Straightforward Book-answerable
From standard books
Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 12: Major Crops and Cropping Patterns in India > Groundnuts or Peanut (Arachis hypogoea) and Groundnut (Arachis hypogaea) > p. 33
Presence: 5/5
“Groundnuts give good returns in sandy soil. Groundnut is grown mainly in the dry tropical and sub-tropical climates, in the savanna regions of West Africa, in the monsoonal climates of China and India where sandy soils are the most important determinant. Te groundnut is an annual crop, and because it is a leguminous crop which adds valuable nitrogen to the soil, it is often grown in rotation with other crops like millets, maize or cotton crop. Groundnut is a labour intensive crop. Fertilizer is applied with the seeds when they are planted and the nuts are picked by hand. Te outer shells are usually removed in the producing regions to minimize transport cost and the nuts are sacked for export.”
Why this source?
  • Explicitly describes groundnut as a 'leguminous crop', i.e., a member of the legume/pea group.
  • Notes groundnut adds valuable nitrogen to the soil, a characteristic of leguminous (Fabaceae) plants.
Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 25: Agriculture > Pulses or Grain Legumes > p. 353
Presence: 5/5
“• Pulses are major source of protein in Indian diet and providing most of the essential amino acids to a certain degree. Economically, pulses are cheapest source of protein. • It is cultivated to enrich the soil, to utilize the residual moisture and to give revenue in a shorter period. Red gram Black gram Oreen grarn Cowpea Bengalgram Horsegram Dewgram Soyabean Peas or gardenpea Garden bean”
Why this source?
  • Section title is 'Pulses or Grain Legumes' and the listed items include 'Horsegram' and 'Soyabean'.
  • Classifies horsegram and soybean within the pulse/legume category, linking them to the pea/legume family.
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