Mention whether the following statements are true (T) or false (F) and give explanation in support of your answer.
(a) Guttation is another name for bleeding in plants.
(b) Soaked seeds burst their seed coats.
(c) If the phloem of a twig is removed keeping the xylem intact, the leaves of a twig wilt.
(d) Guttation in plants occurs maximum at mid-day.
(e) Raisins when submerged in water swell up due to endosmosis.

Question

Mention whether the following statements are true (T) or false (F) and give explanation in support of your answer.
(a) Guttation is another name for bleeding in plants.
(b) Soaked seeds burst their seed coats.
(c) If the phloem of a twig is removed keeping the xylem intact, the leaves of a twig wilt.
(d) Guttation in plants occurs maximum at mid-day.
(e) Raisins when submerged in water swell up due to endosmosis.

KnowledgeBoat · Accepted Answer

(a) False Reason Guttation is the process by which drops of water appear along leaf margins due to excessive root pressure whereas bleeding is the loss of cell sap through a cut stem. (b) True Reason The seeds and grains swell up when soaked in water due to imbibition and endosmosis. The force generated by water thus absorbed is strong enough to make the seeds coats burst. (c) False Reason The leaves of the twig remain turgid since its xylem is intact and xylem is responsible for water conduction in plants. (d) False Reason Guttation is the exudation of drops of xylem sap on the tips of leaves and occurs due to excessive root pressure. It is maximum when root pressure is maximum which occurs in the early mornings or at night. This is because during these times, transpiration is very low and water absorption is very high. (e) True Reason When raisins are submerged in water, concentration of solute inside the raisins is more than the concentration of water. Water acts as a hypotonic solution for raisins due to which endosmosis occurs. As raisins absorb water due to endosmosis, they swell up.

Biology

Roots Absorption

Answer

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