# DBT JRF 2020 — Question 52

Exam: DBT JRF 2020 · Section: B · Topic: Plant Biology · Difficulty: Easy

## Question

Pruning helps in making the hedge dense because

## Options

- **A.** it induces the differentiation of new shoots from the rootstock
- **B.** it frees axillary buds from apical dominance
- **C.** the apical shoot grows slower after pruning
- **D.** more root growth supports more shoot branches

## Answer

Option B

## Explanation

Crop rotation is the practice of growing different crops in sequential seasons on the same land. Ecological benefits: (1) Nitrogen replenishment — legumes (soybean, pea, clover) fix atmospheric $\text{N}_2$ via rhizobial symbiosis, replenishing soil nitrogen naturally; (2) Pest/pathogen cycle disruption — breaking monoculture eliminates host-specific pathogens and pests; (3) Soil structure improvement — different root architectures improve aeration and water retention; (4) Weed suppression — varied crops prevent adaptation of weeds. Repeated use of fertilisers causes soil salinisation, pH imbalance, and microbiome disruption. Growing the same crop depletes specific nutrients and builds up crop-specific pests. Burning crop waste destroys organic matter and releases $\text{CO}_2$ .

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