Name the external factor of growth in plants.
Correct answer: B. Water.
- A. Carbon dioxide.
- B. Water.
- C. Hormones.
- D. Nutrition.
Explanation
Environmental factors that affect plant growth include light, temperature, water, and humidity.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Plant Nutrition and Transport
Plants require macronutrients and micronutrients for growth, and mineral deficiencies produce recognizable symptoms. Transport involves water and minerals through xylem by transpiration pull, cohesion and adhesion, while phloem translocates sugars from sources to sinks. Root pressure and transpiration are distinct mechanisms.
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