Plant Physiology SAQ'S Q & A

Root hairs increase the surface area for nutrient absorption from the soil.

Active transport moves substances from an area of low concentration to high concentration using energy.

Mycorrhizae enhance nutrient absorption for plants while receiving sugars in return.

<p>Xylem tissue is entirely dead, while phloem tissue is composed of living cells.</p> Signup and view all the answers

<p>Lignin reinforces xylem cell walls, making them strong, water-resistant, and durable.</p> Signup and view all the answers

<p>Rhizobium converts atmospheric nitrogen into soluble nitrates usable by plants.</p> Signup and view all the answers

<p>Xylem vessels have no end walls, facilitating uninterrupted water transport.</p> Signup and view all the answers

<p>Phloem transports sugars produced by photosynthesis from leaves to other plant parts.</p> Signup and view all the answers

<p>Guard cells regulate the opening and closing of the stomata, which control gas exchange.</p> Signup and view all the answers

<p>Transpiration creates tension that helps pull water up through the xylem from the roots to the leaves.</p> Signup and view all the answers

<p>The cohesion-tension model describes how water molecules stick together, creating tension that aids in the upward movement of water.</p> Signup and view all the answers

<p>Osmosis is the movement of water from high to low concentration, and it generates root pressure by drawing water into root hairs.</p> Signup and view all the answers

<p>Transpiration is the loss of water vapor from leaves, crucial for cooling the plant and driving water movement.</p> Signup and view all the answers

<p>Sieve tubes transport food produced by photosynthesis throughout the plant.</p> Signup and view all the answers

<p>Xylem is responsible for the transport of water and minerals from the roots to the leaves.</p> Signup and view all the answers

<p>The rate of transpiration in leaves is influenced by factors such as humidity, temperature, and the opening of stomata.</p> Signup and view all the answers

<p>Chlorophyll absorbs light energy from the sun, which is crucial for driving the photosynthesis process.</p> Signup and view all the answers

<p>The two main stages of aerobic respiration are glycolysis and the Krebs cycle.</p> Signup and view all the answers

<p>Stomata facilitate gas exchange by allowing oxygen, water, and carbon dioxide to diffuse in and out of the plant.</p> Signup and view all the answers

<p>The cuticle prevents water loss from the leaf's surface, helping to retain moisture.</p> Signup and view all the answers

<p>Glycolysis breaks down glucose into two molecules of pyruvic acid and occurs in the cytosol.</p> Signup and view all the answers

<p>Companion cells control the activities and regulate the functioning of sieve tubes.</p> Signup and view all the answers

<p>Leaves have a flat structure that maximizes light absorption for efficient photosynthesis.</p> Signup and view all the answers

<p>Pyruvic acid is converted into acetyl coenzyme A, which enters the Krebs cycle.</p> Signup and view all the answers

<p>Osmotic pressure helps pull water molecules through the xylem cells, facilitating their upward movement in plants.</p> Signup and view all the answers

<p>Transpiration creates a negative pressure that pulls water upwards through the xylem.</p> Signup and view all the answers

<p>The transport of water through the xylem does not require energy; it occurs passively through physical processes.</p> Signup and view all the answers

<p>Cohesion allows water molecules to stick together, enabling them to be pulled in a continuous column through the xylem.</p> Signup and view all the answers

<p>Osmosis drives water molecules into the xylem and maintains the flow by pulling the next molecule along.</p> Signup and view all the answers

<p>The xylem is essential for conducting water from the roots to the rest of the plant, enabling vital functions.</p> Signup and view all the answers