What feature of roots increases water and nutrient absorption?

What feature of roots increases water and nutrient absorption?

• A. Provide mechanical support
• B. Store sugars
• C. Increase surface area for water and nutrient absorption
• D. Conduct photosynthesis

Answer: (C)

The main idea is that increasing the surface area of roots boosts their ability to absorb water and nutrients. Roots achieve this with root hairs—tiny extensions of the epidermal cells—that dramatically enlarge the contact surface between the root and the soil solution. More surface area means more sites where water and dissolved minerals can cross into the root cells. Water moves by osmosis, and minerals enter mainly through transport proteins that actively move ions into the root. With a larger surface area, more water and nutrients can be taken up efficiently, especially as roots explore the soil. Other roles like providing mechanical support or storing sugars are important for the plant, but they don’t enhance absorption to the same extent, and photosynthesis occurs mostly in leaves, not in roots.

The main idea is that increasing the surface area of roots boosts their ability to absorb water and nutrients. Roots achieve this with root hairs—tiny extensions of the epidermal cells—that dramatically enlarge the contact surface between the root and the soil solution. More surface area means more sites where water and dissolved minerals can cross into the root cells. Water moves by osmosis, and minerals enter mainly through transport proteins that actively move ions into the root. With a larger surface area, more water and nutrients can be taken up efficiently, especially as roots explore the soil. Other roles like providing mechanical support or storing sugars are important for the plant, but they don’t enhance absorption to the same extent, and photosynthesis occurs mostly in leaves, not in roots.