Plant Osmoregulation and Water Balance Quiz

Which of the following structures in plants plays a key role in maintaining water balance by regulating gas exchange?

• Stomata

• Chloroplasts

• Xylem vessels

• Phloem tubes

Which plant hormone is involved in the regulation of stomatal closure during water stress?

• Abscisic acid

• Auxin

• Gibberellin

• Ethylene

What is the primary role of the vacuole in a plant cell?

• To store water

• To produce energy

• To synthesize proteins

• To transport nutrients

Why is maintaining turgor pressure important for plant cells?

• It is essential for plant rigidity, support, and osmoregulation.

• It helps in photosynthesis.

• It aids in cell division.

• It increases the rate of respiration.

A plant cell loses water from its vacuole. What is the most likely consequence for the plant?

• The plant will lose rigidity and may wilt.

• The plant will grow faster.

• The plant will produce more chlorophyll.

• The plant will increase its turgor pressure.

Where is the cuticle located in a plant leaf?

• Covering the epidermis

• Inside the mesophyll

• Surrounding the nucleus

• At the base of the stem

Why is the cuticle important for plant survival, especially in dry environments?

• It helps the plant absorb more sunlight

• It prevents excessive water loss through evaporation

• It increases the rate of gas exchange

• It stores nutrients for the plant

Why is the regulation of stomatal closure important for plants?

• It increases nutrient uptake

• It helps conserve water during stressful conditions

• It accelerates seed germination

• It promotes leaf expansion

What are aquatic plants commonly called?

• Xerophytes

• Hydrophytes

• Mesophytes

• Halophytes

Why do hydrophytes not need large vacuoles?

• They store more nutrients

• They have excess water availability

• They need to retain more water

• They have thick cuticles