Biology
Complete the following statements:
(a) Hypotonic solution is one in which the solution kept outside the cell has …………… solute concentration than inside the cell.
(b) Active transport is one in which the ions outside the roots move in by utilising …………… .
(c) The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of …………… .
Roots Absorption
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Answer
(a) Hypotonic solution is one in which the solution kept outside the cell has lower solute concentration than inside the cell.
(b) Active transport is one in which the ions outside the roots move in by utilising energy from the cell.
(c) The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of turgor movements.
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Related Questions
Name the following:
(a) The condition of a cell placed in a hypotonic solution.
(b) The process by which intact plants lose water in the form of droplets from leaf margins.
(c) The process by which water enters root hairs.
(d) The tissue concerned with upward conduction of water in plants.
(e) The term for the inward movement of solvent molecules through the plasma membrane of a cell.
(f) The process by which molecules distribute themselves evenly within the space they occupy.
(g) The pressure which is responsible for the movement of water molecules across the cortical cells of the root.
Give the equivalent terms for the following:
(a) Pressure exerted by the cell contents on the cell wall.
(b) The condition in which the cell contents are shrunken.
(c) Loss of water through a cut stem.
Fill in the blanks by choosing the correct alternative from those given in brackets.
(a) When placed in a more concentrated solution, the cell contents will …………… (shrink / swell up).
(b) The pressure by which the …………… molecules tend to cross the semi-permeable membrane is called osmotic pressure. (salt / water)
(c) Active transport is in a direction …………… to that of diffusion. (opposite / same)
Match the items in column I with those in column II
Column I Column II (a) Xylem (i) semi-permeable (b) Phloem (ii) permeable (c) Cell membrane (iii) downward flow of sap (d) Root pressure (iv) upward flow of water (e) Cell wall (v) guttation