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Mass flow seems to be the prominent mode of transport during
Mass flow is a prominent mode of transport in translocation of organic solutes within phloem ,traslocation of water and minerals in xylem and apolplastic movement of water in plants
What is not a part of apoplast?
The lumen of a sieve tube.-much of the water and ions that soak into a plant root remain in the walls of the cortex cells and move toward the stele along an extracellular pathway known as the apoplast. at the endodermis, that extracellular pathway is blocked since each endodermal cell has a waxy belt in its wall called a casparian strip, which is impervious to water and dissolved minerals, thereby blocking the apoplast, between the cortex and the stele. water and minerals that make it to the endodermis along the apoplast can enter the stele only by crossing the plasma membrane of an endodermal cell, and passing through the plasmodesmata.
Which is not an example of imbibition
Imbibition is a special type of diffusion that takes place when water is adsorbed by solids-colloids causing an increase in volume. Examples include the absorption of water by seeds and dry wood.
When raisins are placed in water, the water from the surrounding diffuses into the raisins and so the raisins swell up. The phenomenon involved is called osmosis
When the cell is flaccid
A cell is said to be flaccid when the plant cell is placed in an isotonic solution where the concentration of solutes is same both outside & inside. The plasma membrane is not tighty in touch with cell wall as in turgid cell. Turgor pressure of such cells is zero.
When a cell is plasmolysed what lies between the cell
wall and the cell membrane?
The space between the cell wall and the shrunken protoplast in the plasmolysed cell is occupied by the HYPERTONIC SOLUTION IN WHICH THE CELL IS KEPT.
A value that is always negative in a cell is
Pure water's solute potential is zero because it does not contain any amount of solute in the water. Increase in the number of solute results in the decrease in the water potential, and therefore solute potential is always negative
In which of the following, all three are macronutrients?
Option (c) has nitrogen, phosphorus & magnesium which are macronutrients
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by
During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisioning is prevented by leghaemoglobin.
It is a red-pigment that is filled outside the peribacteroid space in the cytosol of nodule cells. It is similar to haemoglobin of red blood cells. It has the ability to combine very rapidly with oxygen and thus acts as a very efficient O2 scavenger.
Deficiency symptoms of nitrogen and potassium are visible first in
(a) Deficiency of both nitrogen (N) and potassium (K) are visible in senescent (older) leaves. Due to deficiency of N, chlorosis happens and because of deficiency of K, inhibition of protein synthesis and scorching of older leaves happens.
The most abundant intracellular cation is
(d) Major intracellular cation is K+. Major extracellular cation is Na+.
Ca+ play major role in signal tansductor pathways.
H+ is found in aqueous solution of all acids.
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