Tag: mineral transport
Questions Related to mineral transport
Which is the control point in roots where a plant adjust the quantity and quality of solute that reach the xylem:
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At root hair cell
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At endodermal cell
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At pericycle
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At cortical cell
Much of starch is deposited in fruits as it matures. Which of the following explains that how the starch gets there?
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Starch solution passes through cells from xylem to fruit.
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Starch solution passes through companion cells to fruit.
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Starch grains passes through cells from xylem to fruit.
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A sugar solution passes through phloem cells to the fruit, where it is changed to starch.
According to the most widely accepted theory of translocation of organic solutes - 'Mass flow hypothesis' or 'Pressure flow hypothesis', organic substances move in the sieve tubes from the region of higher osmotic concentration to the region of lower osmotic concentration in a mass flow, due to occurrence of a pressure gradient.
A scientist associated with work on translocation is
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Arnon
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Calvin
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Dixon
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Munch
'Mass flow hypothesis' or 'Pressure flow hypothesis' to explain translocation was given by Munch, 1930.
Translocation of food in higher plants is related to the idea of
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Source and sink
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Ascent of sap
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Diffusion
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Cyclosis
Translocation of organic solutes in phloem is bidirectional. The transport of prepared food is from source to sink. The source is the area, where sugars are present in larger amount either because they are synthesized there, example leaves or are stored there, example storage organs.
Which of the following act as sink?
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Root cells
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Fruit
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Seeds
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All of the above
Translocation of organic solutes in phloem is bidirectional. The transport of prepared food is from source to sink.
Which pressure is responsible for ascent of sap?
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Negative hydrostatic pressure
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Positive hydrostatic pressure
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Root pressure
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All of the above
- In the Root Pressure, the root Xylem vessels absorb the minerals from the soil, as a result, the water potential outside the root increase and inside the root decreases so due to water potential difference water starts entering to the xylem of the root.
Root pressure is caused by
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Osmosis
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Diffusion
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Passive transport
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Uphill transport
Root pressure is caused in the Xylem vessels due to osmosis. It is a positive pressure which is developed due to Osmotic pressure which is high in the root as compared to the water column above.
Which condition will not favour guttation?
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High moisture
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High DPD in leaf
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Accumulation of ions in root side
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Low light intensity
Identify the correct sequence of movement of water in the root of higher plants.
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Epidermic - Cortex -Pericycle-endodermis - phloem
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Epidermis -Cortex-endodermis -pericycle -phloem
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Epidermis -Cortex -pericycle-endodermis -xylem
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Epidermis -Cortex-endodermis-pericycle -xylem
Root pressure is generally not found in
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Wheat plant
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Colocasia
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Pinus
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All of these