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

Which of the following factors does not influence the rate of transpiration?

  1. Stomatal Conductance

  2. Leaf Area Index

  3. Vapor Pressure Deficit

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

Wind speed does not directly influence the rate of transpiration. Stomatal conductance, leaf area index, and vapor pressure deficit are the primary factors that influence the rate of transpiration.

Multiple choice

The process by which plants release water vapor through their leaves is known as (T). What does (T) stand for?

  1. Transpiration

  2. Translocation

  3. Turgidity

  4. Tension
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transpiration (T) is the process by which plants release water vapor through their leaves.

Multiple choice

Which of the following is not a benefit of transpiration?

  1. Cooling of the plant

  2. Transport of nutrients

  3. Regulation of water balance

  4. Release of oxygen into the atmosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Transpiration does not directly release oxygen into the atmosphere. It is a process that involves the release of water vapor from plants.

Multiple choice

In the context of transpiration, what is the term used to describe the difference in water vapor pressure between the leaf and the surrounding air?

  1. Vapor Pressure Deficit

  2. Saturated Vapor Pressure

  3. Relative Humidity

  4. Dew Point
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vapor pressure deficit (VPD) is the difference in water vapor pressure between the leaf and the surrounding air. It is a key factor that drives transpiration.

Multiple choice

Which of the following genes is known to confer drought tolerance in plants?

  1. DREB1

  2. RD29A

  3. COR15A

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

DREB1, RD29A, and COR15A are examples of well-characterized genes that have been shown to confer drought tolerance in plants when overexpressed through genetic engineering.

Multiple choice

How does modification of root architecture contribute to drought tolerance in plants?

  1. Enhances water uptake from deeper soil layers

  2. Reduces water loss through transpiration

  3. Improves root-to-shoot communication

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

Modification of root architecture through genetic engineering can lead to enhanced water uptake from deeper soil layers, reduced water loss through transpiration, and improved root-to-shoot communication, all of which contribute to drought tolerance.

Multiple choice

What is the term for the amount of water that a plant loses through its leaves?

  1. Transpiration

  2. Evaporation

  3. Condensation

  4. Precipitation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transpiration is the term for the amount of water that a plant loses through its leaves. It is a natural process that helps plants cool down and transport nutrients.

Multiple choice

Which process involves the release of water vapor from plants into the atmosphere?

  1. Infiltration

  2. Evaporation

  3. Transpiration

  4. Runoff
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transpiration is the process by which plants release water vapor into the atmosphere through their leaves.

Multiple choice

What is the process by which plants release water vapor into the atmosphere?

  1. Evaporation

  2. Condensation

  3. Precipitation

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

Transpiration is the process by which plants release water vapor into the atmosphere. This process occurs when water vapor diffuses out of the leaves of plants through small pores called stomata.

Multiple choice

What is the role of plants in the Hydrologic Cycle?

  1. They absorb water from the soil and release it into the atmosphere through transpiration.

  2. They help to filter and clean water as it moves through the soil.

  3. They provide shade and help to reduce evaporation from the soil.

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

Plants play a crucial role in the Hydrologic Cycle. They absorb water from the soil and release it into the atmosphere through transpiration, helping to drive the cycle. They also help to filter and clean water as it moves through the soil, and they provide shade and help to reduce evaporation from the soil.

Multiple choice

The phenomenon of plants responding to the direction of light is known as:

  1. Phototropism

  2. Geotropism

  3. Thigmotropism

  4. Hydrotropism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Phototropism is the phenomenon of plants responding to the direction of light, with shoots growing towards the light and roots growing away from it.

Multiple choice

Which of the following is NOT a functional trait?

  1. Leaf area

  2. Root depth

  3. Pollination mechanism

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

Species richness is a measure of the number of different species in a community, while functional traits are the different ways in which organisms perform their ecological roles.

Multiple choice

What is the process by which plants absorb water and nutrients from the soil?

  1. Photosynthesis

  2. Respiration

  3. Transpiration

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

Absorption is the process by which plants absorb water and nutrients from the soil through their roots.

Multiple choice

What is the term for the process by which plants lose water vapor through their leaves?

  1. Transpiration

  2. Photosynthesis

  3. Cellular respiration

  4. Nitrogen fixation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transpiration is the process by which plants lose water vapor through their leaves, helping to regulate their temperature and transport nutrients.

Multiple choice

Which of the following is not a defense mechanism?

  1. Repression

  2. Projection

  3. Rationalization

  4. Sublimation

  5. Compensation
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Repression, projection, rationalization, and sublimation are all defense mechanisms. Compensation is not a defense mechanism.