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 bio-chemistry plant physiology active transport and passive transport types of plant transport atp

The physical process involved in the release of molecular oxygen from leaves is

  1. Diffusion

  2. Transpiration

  3. Osmosis

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

Diffusion is a slow process and is not dependent on a living system. Diffusion is very important to plants since it the only means for gaseous movement within the plant body. Intake of carbon dioxide and release of oxygen through stomata occurs through the process of diffusion. Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.

Multiple choice bio-chemistry plant physiology active transport and passive transport types of plant transport atp

In apoplast pathway, water moves exclusively through the

  1. Plasmodesmata

  2. Cell walls

  3. Intercellular spaces

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Apoplast pathway consists of non-living parts of plant body i.e., cell walls and intercellular spaces. In apoplast pathway, water passes from root hair to xylem through the walls of intervening cells without crossing any membrane or cytoplasm. The pathway provides the least resistance to movement of water. However, it is interrupted by the presence of impermeable lingo-suberin casparian strips in the walls of endodermal cells.
So, the correct answer is 'Both B and C'.
Multiple choice botany plant water relation active transport and passive transport types of plant transport atp

The process of diffusion is involved in _____________.

  1. Respiration

  2. Photosynthesis

  3. Transpiration

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

Diffusion keeps the cell walls of the internal plant tissues moist. It is a means of spreading of ions and other substances throughout the protoplast. Transpiration or loss of water in vapour forms is a diffusion process. Exchange of gases (CO2(CO2 and O2)O2) during photosynthesis and respiration between the plant interior and outside air also occurs through diffusion.

Multiple choice

Chaparral plants usually survive fires because

  1. they contain oils that act as natural fire extinguishers

  2. water is stored in their small, leathery leaves

  3. they can resprout from surviving tissue

  4. they have deep root systems to keep them moist
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chaparral plants have evolved to survive frequent fires by having specialized tissues that allow them to resprout quickly after the aboveground parts are destroyed.

Multiple choice

How does a plant get water from the soil?

  1. Through its flowers

  2. Through its roots

  3. Through its stem

  4. Through its leaves
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Roots are the primary plant organs responsible for absorbing water and dissolved minerals from the soil. They also anchor the plant in the ground.

Multiple choice botany breath and blood of life different types of circulatory systems stomata and transpiration transport in organisms

The loss of water from the aerial parts of the plant is known as

  1. Photosynthesis

  2. Transpiration

  3. Reproduction

  4. Respiration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosynthesis is the process of synthesis of food from inorganic compounds like carbon dioxide and water and sunlight.

Transpiration is the process of release of water vapour from aerial parts, such as leaves, stems and flowers.
Reproduction is the process of producing an offspring for continuation of species.
Respiration is the process of releasing energy by breaking down organic compounds like sugars.
So, the correct answer is 'Transpiration'.

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Rate of water absorption generally follows closely the rate of

  1. Transpiration

  2. Photosynthesis

  3. Respiration

  4. Growth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The rate of transpiration is high on a bright sunny day. The water is lost from guard cell which leads to decrease in the water potential of guard cell as compared to the surrounding cell. To stabilize the water potential in the guard cell water rushes from the neighboring cell which creates a cohesion pull in the xylem vessels to pull the water up to the guard cell. Thus, the rate of water absorption increases when the transpiration is high. 
So, the correct answer is option A.
Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Water absorption through roots can be increased by keeping the plants

  1. In the shade

  2. In dim light

  3. Under the fan

  4. Covered with a polythene bag
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Water absorption through the roots can be increased by keeping the plants under the fan. 
  • As by keeping the plants under the fan, the transpiration process is boosted. Therefore, more amount of water and other minerals are absorbed by the plant roots from the soil. 
  • The more is the rate of evaporation of water from the plants the greater is the rate of transpiration.
  • Hence Water absorption through roots can be increased by keeping the plants under the fan.
  • So, the correct answer is 'Under the fan'.
Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

In root apoplast path of water transport; the water is transported through

  1. Cell wall only

  2. Cell wall and inter cellular spaces

  3. Intercellular spaces

  4. Intercellular spaces, cell walls and endodermis.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The water transport in the apoplastic pathway is through the cell membrane and the intercellular spaces. Water and solutes can pass freely through them.

This happens when water cannot enter the cells due to the presence of Caspian strips. 
So the correct answer is ' Cell wall and intercellular spaces'.

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

The pathway which water moves through cell wall without crossing any membrane

  1. apoplast pathway

  2. symplast pathway

  3. vacuolar pathway

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

The apoplast pathway refers to the movement of water through the cell walls and intercellular spaces without crossing any plasma membranes.

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Mark true statement about apoplast pathway.

  1. Apoplast pathway may be aided by cytoplasmic streaming

  2. Apoplast pathway is continuous throughout the plant without any exception

  3. Apoplast pathway is faster than symplast pathway

  4. In Apoplast pathway mass flow of water occurs through plasmodesmata
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Apoplast is the system of cell walls which is continuous throughout the plant except in some parts like Casparian strips in the roots. Therefore it cannot be aided by cytoplasmic streaming and cannot occur through plasmodesmata. So, the correct answer is 'apoplast pathway is faster than the symplast pathway'