Multiple Choice Questions on Plant Physiology with answers. Essential topic for all PMT Exam. The water readily available to plants for absorption by roots is a Gravitational water b Capillary water c Rain water d Hygroscopic water. The water potential of pure water at atmospheric pressure is a Loss of water from the stomata of leaves are known as a Guttation b Exudation c Transpiration d Evaporation. During rainy season wooden doors are difficult to open or closure because of a Plasmolysis b Imbibition c Osmosis d Diffusion.
Plasmolysis occurs due to a Absorption b Osmosis c Endoosmosis d Exosmosis. The marine animals that kept in fresh water burst. It shows the process of a Exosmosis b Endoosmosis c Plasmolysis d Deplasmolysis. Cooling of plants is caused by a Guttaion b Photorespiration c Transpiration d Assimilation.
Active uptake of minerals by roots mainly depends on the a Availability of oxygen b Temperature c Light d Availability of CO2. The hormone which signals the closure of stomata is a Auxins b Cytokinine c Gibberelline d Abscisic acid.
Water absorption takes place through a Lateral roots b Root cap c Root hairs d Tap root. What is the action spectrum of transpiration? Which one of the following is used for measuring the rate of transpiration? Transpiration is least in a High atmospheric humidity b good soil moisture c high wind velocity d dry environment. Stomata open at night and close during day time in a Xerophytes b Mesophytes c Succulents d Hydrophytes.
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Inside the root nodules the rhizobia change their form to cells called 1. Your email address will not be published. My Account. Toggle navigation. Go to the shop. The water readily available to plants for absorption by roots is a Gravitational water b Capillary water c Rain water d Hygroscopic water 2. Loss of water from the stomata of leaves are known as a Guttation b Exudation c Transpiration d Evaporation 4.
During rainy season wooden doors are difficult to open or closure because of a Plasmolysis b Imbibition c Osmosis d Diffusion 5. Plasmolysis occurs due to a Absorption b Osmosis c Endoosmosis d Exosmosis 6. It shows the process of a Exosmosis b Endoosmosis c Plasmolysis d Deplasmolysis 7.
Cooling of plants is caused by a Guttaion b Photorespiration c Transpiration d Assimilation 8. Active uptake of minerals by roots mainly depends on the a Availability of oxygen b Temperature c Light d Availability of CO2 9.Water is the most abundant constituent of all physiologically active plant cells. The smallest water contents in living parts of plants occur mostly in dormant structures, such as mature seeds and spores.
The great bulk of the water in any plant constitutes a unit system. This water is not in a static condition. Rather it is part of a hydrodynamic system, which in terrestrial plants involves absorption of water from the soil, its translocation throughout the plant, and its loss to the environment, principally in the process known as transpiration.
The typical mature, vacuolate plant cell constitutes a tiny osmotic system, and this idea is central to any concept of cellular water dynamics.
Although the cell walls of most living plant cells are quite freely permeable to water and solutes, the cytoplasmic layer that lines the cell wall is more permeable to some substances than to others. If a plant cell in a flaccid condition—one in which the cell sap exerts no pressure against the encompassing cytoplasm and cell wall—is immersed in pure water, inward osmosis of water into the cell sap ensues.
This gain of water results in the exertion of a turgor pressure against the protoplasm, which in turn is transmitted to the cell wall. This pressure also prevails throughout the mass of solution within the cell.
If the cell wall is elastic, some expansion in the volume of the cell occurs as a result of this pressure, although in many kinds of cells this is relatively small. If a turgid or partially turgid plant cell is immersed in a solution with a greater osmotic pressure than the cell sap, a gradual shrinkage in the volume of the cell ensues; the amount of shrinkage depends upon the kind of cell and its initial degree of turgidity. When the lower limit of cell wall elasticity is reached and there is continued loss of water from the cell sap, the protoplasmic layer begins to recede from the inner surface of the cell wall.
Retreat of the protoplasm from the cell wall often continues until it has shrunk toward the center of the cell, the space between the protoplasm and the cell wall becoming occupied by the bathing solution. This phenomenon is called plasmolysis. See Osmoregulatory mechanisms. In some kinds of plant cells movement of water occurs principally by the process of imbibition rather than osmosis. The swelling of dry seeds when immersed in water is a familiar example of this process.
Various gases diffuse into and out of physiologically active plants. Those gases of greatest physiological significance are carbon dioxide, oxygen, and water vapor. The great bulk of the gaseous exchanges between a plant and its environment occurs through tiny pores in the epidermis that are called stomates. Although stomates occur on many aerial parts of plants, they are most characteristic of, and occur in greatest abundance in, leaves.
See Epidermis plantLeaf. The term transpiration is used to designate the process whereby water vapor is lost from plants. Although basically an evaporation process, transpiration is complicated by other physical and physiological conditions prevailing in the plant.
Whereas loss of water vapor can occur from any part of the plant which is exposed to the atmosphere, the great bulk of all transpiration occurs from the leaves.
There are two kinds of foliar transpiration: 1 stomatal transpiration, in which water vapor loss occurs through the stomates, and 2 cuticular transpiration, which occurs directly from the outside surface of epidermal walls through the cuticle.
Transpiration is a necessary consequence of the relation of water to the anatomy of the plant, and especially to the anatomy of the leaves. Terrestrial green plants are dependent upon atmospheric carbon dioxide for their survival. In terrestrial vascular plants the principal carbon dioxide—absorbing surfaces are the moist mesophyll cells walls which bound the intercellular spaces in leaves.
Ingress of carbon dioxide into these spaces occurs mostly by diffusion through open stomates. When the stomates are open, outward diffusion of water vapor unavoidably occurs, and such stomatal transpiration accounts for most of the water vapor loss from plants. Although transpiration is thus, in effect, an incidental phenomenon, it frequently has marked indirect effects on other physiological processes which occur in the plant because of its effects on the internal water relations of the plant.
In terrestrial rooted plants practically all of the water which enters a plant is absorbed from the soil by the roots. The water thus absorbed is translocated to all parts of the plant. The upward movement of water in plants occurs in the xylem, which, in the larger roots, trunks, and branches of trees and shrubs, is identical with the wood. In the trunks or larger branches of most kinds of trees, however, sap movement is restricted to a few of the outermost annual layers of wood.
See Xylem.Plant—water relations concern how plants control the hydration of their cells, including the collection of water from the soil, its transport within the plant and its loss by evaporation from the leaves. Flow of water through plant and soil over macroscopic distances is driven by gradients in hydrostatic pressure.
Under water scarcity condition, a hormone causes closure of stomata. The name of the hormone is:. A cell when placed in a solution gets plasmolysed. What is largely present in between the cell wall and plasmolysed contents? The direction and the rate of water movement from cell to cell is based on:.
Which ion has the maximum role in the opening and closing of stomata? Name the phenomenon in which drops of water ooze out of the leaf margin? When a cell is fully turgid, which one of the following is zero? Your email address will not be published. Which of the following has the highest water potential?
Distilled water. Stomata open at night in:. CAM plants. Seeds swell when placed in water because of:. Cell sap. Hypotonic solution. Hypertonic solution. Turgor pressure. Diffusion pressure. Water potentail. Osmotic pressure.
Stometa open when the guard cells are:. Transpiration helps in:. Loss of water. Loss of nutrients. Ascent of sap.The race. To check if a relation is a function, given a mapping diagram of the relation, use the following. Sarcomere length; Length tension relation; Calcium transient ; Calcium sensitivity.
Contents l. Aldrich and John W. Download plant water relation mcq pdf file document. On this page you can read or download plant water relation mcq pdf file in PDF format. Create a PDF File Suggested Post Grade12 Agricultural Sciences Assignmen Agricultural Economics Marketing Agricultural Science Grade12 Practical Investigation Agricultural Marketing Agricultural Sciences Assignment Term 3 Genetic Engineering And Agricultural Economics Memorandum Memo Agricultural Sciences Assignment Grade12 Agricultural Sciences Assignment June Grade12 Random Post users cetificate for nokia x2 accounting project memorandum term 2 grade 12 mathematics paper 1trial exam memo pdf lo risky behavior gr11 maneb jce results at monkeybay cdss motor trade theory n2 papers pdf download dakhil sylebus busineness studies question paper fault finding on protective devices n4 life science grade11 project september Temperature, Heat, And 1temperature, Heat, And simple solutions answer book for socail studies and science.
If you don't see any interesting for you, use our search form below: Find.Plant—water relations concern how plants control the hydration of their cells, including the collection of water from the soil, its transport within the plant and its loss by evaporation from the leaves. Flow of water through plant and soil over macroscopic distances is driven by gradients in hydrostatic pressure. When a cell is fully turgid, which one of the following is zero? Name the phenomenon in which drops of water ooze out of the leaf margin?
A cell when placed in a solution gets plasmolysed. What is largely present in between the cell wall and plasmolysed contents? The direction and the rate of water movement from cell to cell is based on:.
Which ion has the maximum role in the opening and closing of stomata? Under water scarcity condition, a hormone causes closure of stomata. The name of the hormone is:. Your email address will not be published. Cell membrane is:. Selectively permeable.
Cell sap. Hypotonic solution. Hypertonic solution. Turgor pressure. Water potentail. Osmotic pressure. Diffusion pressure. Seeds swell when placed in water because of:. Transpiration helps in:. Loss of water. Loss of nutrients. Ascent of sap. Ascent of sap is best explained by:. Mass flow. Malate hypothesis.
Cohesion of water theory. Stometa open when the guard cells are:. The rate of transpiration is measured by:. Stomata open at night in:. CAM plants. Water crosses the endodermal cells through:. Intercellular space. Cell membranes. Cell walls.This action cannot be undone. This will permanently delete All Practiced Questions.
A few drops of sap were collecled by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap? Which of the following criteria does not pertain to facilitated transport? Two cells A and B are contiguous.
Cell A has osmotic pressure 10 atm, turgor pressure-7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be. Botany All. Chemistry All.
Physics All. Zoology All. Show All Easy Medium Hard. Are you sure? The water potential of pure water is a zero b less than zero c more than zero, but less than one d more than one. View Explanation Difficulty Level. To view Explanation, Please buy any of the course from below.
Difficulty Level:. Root pressure develops due to a active absorption b low osmotic potential in soil c passive absorption d increase in transpiration. A column of water within xylem vessels of tall trees does not break under its weight because of a dissolved sugars in water b tensile strength of water c lignification of xylem vessels d positive root pressure.
plant water relation mcq with answers download
Transpiration and root pressure cause water to rise in plants by a Pulling it upward b pulling and pushing it, respectively c pushing it upward d pushing and pulling it, respectively. Which one of the following elements in plants is not remobilised?
Passage cells are thin-walled cells found in: a endodermis of roots facilitating rapid transport of water from cortex to pericycle b phloem elements that serve as entry points for substances for transport to other plant parts c testa of seeds to enable emergence of growing embryonic axis during seed germination d central region of style through which the pollen tube grows towards the ovary. Android App Google Play.The membrane that allows some of solute molecules to pass through it and prevent others is called.
The membrane which allows the solvent molecules to pass through it and not the solute molecules is called. A cell with fully elastic wall is placed in hypertonic solution.
mcq of physiolpgicaland plant water relation
What will not happen. When cell is placed in 0. So the external solution is called. The concentration of cell sap would be. When a cell is placed im 0. But if the same cell is placed in 0. When chemical fertilizers are given to plants, the soil is to be thoroughly watered otherwise, the plants get killed because of. The pressure that prevails in cell due to number of substance dissolved in cell sap is. The plasmolysed cells regain turgidity and assume original volume under influence of hypotonic solution.
The process is called. A wooden peg inserted in a rock causes its breaking during the rainy season. It is due to development of.MCQ SERIES-=-=-=PLANT WATER RELATIONSHIP PART --03
A solution of 1. What is not correct. In thistle funnel experiment, entry of water into thistle funnel stops after some time automatically due to.
Stomatal aperture is surrounded by guard cells and widens opens when guard cells are.