Transport in plants practice · Mixed difficulty

Who proposed the ‘Cohesion Theory’ of ascent of sap?

In thistle funnel experiment, what will occur if sugar solution is added to beaker, after the process of osmosis stops?

Which among the following is under the influence of both pressure and concentration?

Mycorrhiza mainly helps in absorption of

The cell A has an osmotic potential of – 20 bars and a pressure potential of + 6 bars. What will be its water potential?

A leaf peeling of Tradescantia is kept in a medium having 10% NaCl. After a few minutes, if we observe the leaf peel under the microscope, we are likely to see

Consider the following statements and choose the correct option from codes given below
I. Loading of phloem is related to increase of sugar in phloem
II. Active loading of sugar in sieve tube of phloem is driven by proton pump
III. Pressure may be positive or negative in sieve tube cells
IV. Water and solutes move through the sieve tube against pressure gradient
V. Cytoplasmic strand passes through the holes in sieve plates and form continuous filaments

What will be the affect of accumulation of potassium ions in guard cells?

Why seeds imbibe and swell after keeping in water?

Water potential and osmotic potential of pure water is

When a molecule moves across a membrane independent of other molecules, the process is called

Which among the following would be the best hypothesis to
explain the mechanism of stomatal action in night in
succulent plants when the stomata remains open?

Wooden doors and logs swells up, and get stuck up during rainy season due to

At the time of seed germination, when water is absorbed by the seed due to imbibition, the seed coat breaks as it swells to a lesser degree than the kernel because

If the osmotic pressure of cytoplasm in a cell is balanced by external solution, the solution must be

Root hair absorb water from the soil on account of

A plant cell becomes turgid due to

Which of the following maintains the shape of cell?

Which of the following is used as an antitranspirant?

Water in the vessel of xylem in tall plant is

What happens when concentration of solutes decreases in guard cells?

Transport of gases, hormones, photosynthetase and organic solutes in plants is

Two cell (A and B) have osmotic potential and pressure potential – 18 bars and 8 bars, and – 14 bars and 2 bars respectively. What will be the direction of water flow?

Identify true and false statements and select the correct option from the codes given below
I. As suction pressure increases, water absorption also increases which in turn increases the absorption of ions
II. Absorption of ions is affected by transpiration pull
III. Large amount of charged particles are absorbed along with absorption of water
IV. Pressure flow hypothesis depends entirely on the existence of mechanism for loading sugars into phloem at the source region and unloading it at the sink
V. Contents in the sieve tube move undirectionally

Assertion: Transpiration facilitate supply of
water for photosynthesis, maintains shape and
structure of plant and transport minerals from
the soil to other parts of the plant.

Reason: Process of transpiration helps in
translocation of inorganic and sugar molecules
from the source to sink.

The non - living continum that occurs in plants is called?

Whose water potential is less than water potential of root hair during the water absorption by root hair?

Who is called father of plant physiology

Water loss in form of liquid droplets is

Osmosis is?