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WorksheetsTransport in Plants- Quiz 7
Total questions: 25
Worksheet time: 9mins
Ions from soil reach to xylem of root through –
Active uptake only
Passive uptake only
Only diffusion
Active or passive uptake or a combination of both
Unloading of mineral ions occurs at the fine vein endings through –
Diffusion only
Active transport only
Diffusion and active transport
Facilitated diffusion and active transport
Transpiration facilitates –
Transferring minerals to leaves
To maintain turgidity (hence shape and structure of the plant)
availability of water to photosynthesis
All
Transport of water through the xylem is –
Active, requiring energy expenditure by the soil
Passive requiring no energy expenditure by the plant
Active requiring energy expenditure by plant
Passive unless the soil is very dry
Root hairs do not play a role in –
O2 uptake
minerals uptake
water uptake
CO2 uptake
Which of the following cells are found in pairs on the leaf surface?
Subsidiary cells
Stomata
Guard cells
Epidermal cells
Which is correct –
Sink for minerals is root and source is growing regions of plant.
Small amount of exchange of materials takes place between xylem and phloem
Structural components like Ca are remobilised
None
Guttation is the result of :
Diffusion
Transpiration
Osmosis
Root pressure
Phloem sap is mainly made of
water and sucrose
water and minerals
oligosaccharides and hormones
none of these.
The osmotic expansion of a cell kept in water is chiefly regulated by :
Mitochondria
Vacuoles
Plastids
Ribosomes
Transport proteins of endodermal cells are control points, where a plant adjusts the quantity and type of solutes that reach the xylem. Root endodermis is able to actively transport ions in one direction only because of the layer of
Actin
Lignin
Suberin
Cellulose
Which one gives the most valid and recent explanation for stomatal movement?
Starch hydrolysis
Guard cell photosynthesis
Transpiration
Potassium influx and efflux
Root pressure develops due to
Passive absorption
Active absorption
Increase in transpiration
Low osmotic potential in soil
A few drops of sap were collected 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 ?
Low refractive index
Absence of sugar
Acidic
Alkaline
Which of the following forms of soil-water is commonly absorbed by plants ?
Hygroscopic water
Capillary water
Gravitational water
Free water
In plant ‘transpiration pull’ theory for ascent of sap was first proposed by :
Dixon
Dixon and Jolly
J. C. Bose
Strasburger
Which of the following facilitates opening of stomatal aperture ?
Decrease in turgidity of guard cells
Radial orientation of cellulose microfibrils in the cell wall of guard cells
Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells
Contraction of outer wall of guard cells
The water potential of pure water is :
Less than zero
More than zero but less than one
More than one
Zero
Continuous water column is created in xylem during transpiration pull due to
Cohesion and adhesion forces
Dead nature of cell wall
Less lignification of cell wall
High tensile strength and low capillarity
Death of protoplasm is a pre-requisite for a vital function like –
Transport of sap
Transport of food
Absorption of water
Gaseous exchange
Which of the following is correct about symplast?
Living continuum
Cell wall and intercellular space
Non-Living continuum
None of these
Which of the following is not a feature of active transport of solutes in plants ?
Requires ATP
Occurs against concentration gradient
Non-selective
Occurs through membranes
What will be the direction of flow of water when a plant cell is placed in a hypotonic solution ?
No flow of water in any direction
Water will flow in both directions
Water will flow out of the cell
Water will flow into the cell
What is the direction of movement of sugars in phloem?
Non-multidirectional
Upward
Downward
Bi-directional
Xylem translocates
H2O only
H2O and mineral salts only
H2O, mineral salts and some organic nitrogen only
H2O, mineral salts, some organic nitrogen and hormones
