Biology

Plant Transport and Physiology

1,834 Questions

Access a comprehensive set of questions on plant transport mechanisms and physiological adaptations. Topics include water movement, translocation of food, and plant responses to external stimuli. These biology questions are essential for medical entrance exams and other science competitive tests.

Xylem and phloem transportTranspiration and evaporationPlant adaptationsGeotropic and phototropic responsesWater absorption by rootsRespiration in roots

Plant Transport and Physiology Questions

Multiple choice

Plant factors that affect transpiration include

  1. No & distribution of stomata

  2. % of open stomata

  3. Water status of the plant & canopy structure

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Transpiration is influenced by multiple plant factors, including the number and distribution of stomata, the percentage of open stomata, the plant's water status, and the overall canopy structure.

Multiple choice

The opening of stomata is also aided due to the

  1. orientation of the microfibrils in the cell walls of guard cells

  2. orientation of the microfibrils in the cell walls of subsidiary cells

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The radial orientation of cellulose microfibrils in the guard cell walls allows them to expand primarily in length rather than width when turgid, which pulls the stomatal pore open.

Multiple choice

Stomata

  1. involves in gaseous exchange

  2. Normally open in day and close diring night

  3. Opening and closing is due to c hange in turgidity of the guard cells

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stomata are responsible for gas exchange, typically open during the day, and their movement is regulated by the turgidity of the guard cells.

Multiple choice

Transpiration

  1. is evaporstive loss of water by plants

  2. Occurs mainly through stomata

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transpiration is the evaporative loss of water from plants, occurring primarily through the stomata in leaves.

Multiple choice

The upward movement of water through xylem in plants can achieve fairly high rates up to

  1. 25 me tera per hour

  2. 20 meters per hour

  3. 10 meters per hour

  4. 15 meters per hour
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Xylem sap can move at rates up to 15 meters per hour in some plants under favorable conditions. This rapid movement is driven by the transpiration pull mechanism and the cohesive properties of water. The actual rate varies with plant species, environmental conditions, and water availability.

Multiple choice

Guttaion

  1. Water loss in its liquid phase through hydathodes

  2. Observable at night and early morning

  3. Tip of grass blades and leaves of many herbaceous parts

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Guttation is the loss of water in liquid form through specialized pores called hydathodes, often observed in herbaceous plants during conditions of high humidity and low transpiration.

Multiple choice

In................ movement, thr water travels through the cells.

  1. Apoplastic

  2. Symplast

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In symplastic movement, water travels through the cytoplasm of cells via plasmodesmata (connections between cells). This is in contrast to apoplastic movement where water travels through cell walls and intercellular spaces. The symplastic pathway involves crossing cell membranes and allows for selective transport.