Transportation in plants - class-IX
|Description: transportation in plants|
|Number of Questions: 15|
|Created by: Preeti Dasgupta|
|Tags: botany life processes transportation - the circulatory system transport in plants nutrition in living organisms major activities of living organisms simple nutrients into cells transportation in plants and circulation in animals biology life processes in living organism plant physiology|
Which is the control point in roots where a plant adjust the quantity and quality of solute that reach the xylem:
Much of starch is deposited in fruits as it matures. Which of the following explains that how the starch gets there?
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
'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
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?
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?
- 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
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?
Identify the correct sequence of movement of water in the root of higher plants.
Root pressure is generally not found in
Force responsible for exudation of liquid drops from the margin of the leaves is
- Negative hydrostatic pressure develops at the time of water loss, it occurs when the water is lost through transpiration and creates tension in the cell.
- Transpiration is the process in which water is lost through the upper or aerial plant parts in the form of water.
- Imbibition is the swelling of cells that occurs due to the absorption of water.
- Positive pressure is the force in the xylem which exudates drops of liquids through the stoma to the outside and also requires hydathodes which help in the process of guttation (exudation of water droplets mostly from the leaves margins).
Food from the leaves is conducted ______ through the phloem in the stem.
Food from the leaves is conducted downwards through the phloem in the stem.conduction of water through the xylem occurs generally upwards.
Phloem is responsible for transporting _____ in plants.
Xylem transports and stores water and water-soluble nutrients in vascular plants. Phloem is responsible for transporting sugars, proteins, and other organic molecules in plants.
Food substances travel up and down through ______
Water and salt travel upwards mainly in the xylem and food substances travel up and down in the phloem.
State whether the following statements are true or false:
In the vascular bundle of leaf, xylem is located towards the adaxial side of the leaf.
Leaf has epidermis on both of its surfaces. The photosynthetic tissue of a leaf is sandwiched between its upper and lower epidermis and is well supplied by the vascular system. In a leaf, xylem always faces the upper epidermis i.e. the adaxial side while phloem faces both upper as well as lower epidermis.