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Which of the following statements is correct about transport in plants?
The phloem moves water and minerals obtained from the soil.
Plants have low energy needs and use relatively slow transport systems.
The xylem transports products of photosynthesis from the leaves where they are synthesised to other parts of the plant.
In herbs and shrubs, the distances over which transport systems have to operate are very large.
Plants have low energy needs and use relatively slow transport systems.
Plants have low energy requirements because they are sedentary, meaning they do not need to move. Consequently, they utilize relatively slow transport systems to move water, minerals, and nutrients across their bodies.
Plants have low energy requirements because they are sedentary, meaning they do not need to move. Consequently, they utilize relatively slow transport systems to move water, minerals, and nutrients across their bodies.
Think of a plant's transport system like a passive gravity-fed water tower compared to an active, high-pressure pump system in a skyscraper; because plants don't move or need to maintain constant body temperature, they don't need the 'high-speed' circulatory systems seen in animals.
Plants possess two primary vascular tissues: xylem and phloem. Xylem is responsible for the upward movement of water and dissolved minerals from the roots to the leaves, driven largely by transpiration pull. Phloem facilitates the translocation of organic nutrients (products of photosynthesis) from leaves to all other parts of the plant, utilizing a mechanism often described by the Pressure-Flow Hypothesis.
Xylem moves water and minerals upward from roots.
Phloem moves food (sucrose) from leaves to other parts (translocation).
Plants are sessile (non-moving), resulting in lower metabolic energy expenditure compared to animals.
Small plants transport substances by simple diffusion, while larger plants require vascular tissues.
Growth of tall trees like Redwoods
Survival of plants in varying moisture conditions
| Feature | Transports Water/Minerals | Transports Nutrients/Food |
|---|---|---|
Vascular Tissue | Xylem | Phloem |
Option A is incorrect because phloem does not transport water and minerals from the soil; xylem does.
Option C is incorrect because xylem transports water/minerals, while phloem transports photosynthetic products.
Option D is incorrect because herbs and shrubs are small plants where diffusion or short-distance transport is often sufficient; they do not have 'very large' distances compared to massive trees.
B is correct тАФ Plants have low energy needs and use relatively slow transport systems.
Always remember: Xylem = Water (upward), Phloem = Food (multi-directional). This simple mnemonic helps solve most plant transport MCQs.
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