Transport in plants practice · Medium

Sugar stored in roots may be mobilised to become a source of food in the

Root pressure

Phenomenon of plasmolysis occurs when

Following statements are related with the diffusion of coloured molecules across a membrane. Select the correct statement, which shows the fastest rate of diffusion?

Actively growing plant tissues have a water content of?

Choose the false statement

Assertion: For crops, arid areas are not suitable.

Reason : For planting crops in arid regions,
antitranspirants are used.

Which one of the following does not play a major role in upward movement of xylem sap in tall trees?

Plants growing on hills are likely to show

The phloem sap is?

Which of the following does not affect water potential of water?

Cell-A has osmotic potential of -18 bars and pressure potential of 8 bars, whereas, cell-B has osmotic potential of -14 bars and pressure potential 2 bars. The direction of flow of water will be

Choose, true and false statements from the following and select the correct option from the set (a-d) given below
I. Diffusion is an important process of transport in plants since it is the only means for gaseous movement within the plant body
II. In active transport, pumps are proteins that use energy to carry substance across the cell membrane against concentration gradient
III. In facilitated diffusion, special proteins helps hydrophilic substances to be transported across the membrane
IV. In diffusion, molecules move against concentration gradient in a random manner
V. Facilitated diffusion is faster than active transport

Unloading of minerals occur at

Read the following statement carefully and choose the right answer from the codes given below
I. PMA and silicon oil of low viscosity are considered as antitranspirant
II. BAP, NAA and cobalt chloride is also used as antitranspirant
III. Abscisic acid affects the mechanism of opening and closing of stomata
IV. Starch of guard cells is converted into PEP ions by the process of hydrolysis
V. Potometer works on the principle of potential difference between the tip of the tube and that of plant
VI. Transpiration rate is directly proportional to the relative humidity

Which of the following get accumulated in the vacuoles of guard cells during stomatal opening?

The membrane, which allows passage of certain substances more readily than others is termed as

Imbibition is always accompanied by swelling or increase in the volume of imbibint However, the increase in the volume of the imbibant is

Translocation of organic materials in plants is explained

Root pressure is due to

How will you distinguish between the method of transport between xylem and phloem?

Osmotic pressure is highest in which of the following plant type?

The upward flow of water through the xylem in plants can achieve fairly high rates upto

Water in the soil available to plants is

Correct expression of the following is?

The direction of movement in phloem is …A… and that of xylem is …B… .
Choose the correct pair of options

Assertion: By lowering ${O_2}$
tension, water absorption is reduced.

Reason: Water absorption reduces due to the
accumulation of $C{O_2}$.

Assertion: When the ambient temperature is
high and soil contains excess of water, the plants
tend to lose water in the form of droplets from
lenticels.

Reason: Root pressure regulates the rate of loss
of water form lenticels.

Choose the correct statement

A. Porins allow the entry of small proteins present in the membrane of mitochondria, chloroplast and bacteria

B. When a living cell is kept in hypertonic solution, water potential is equal to solute potential.

C. Carrier proteins will allow entry of all substances across the membrane, whereas pumps transport large molecuoles in a passive method

D. Bulk flow occurs by diffusion

Loss of liquid water by guttation occurs through