Guard cells function as:
Correct answer: B. Multisensory hydraulic valve
- A. The defense system
- B. Multisensory hydraulic valve
- C. Hydrostatic pressure
- D. All of these
Explanation
Guard cells are specialized cells found in the epidermis of leaves that surround and regulate the opening and closing of stomata, which are tiny pores used for gas exchange and act as multisensory hydraulic valves.
This question appeared on the NUMS 2019 (cancelled sitting) 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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