Question

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Sugar is conducted in solution through specialized cells known as: A. fibers. B. companion cells. C. sieve tube dements. D. tracheids. E. vessels. Q.22. High squareroot pressure can cause water to be lost by leaves through the process of A) respiration B) regurgitation C) transpiration D) guttation E) translocation Q.23. Which of the following terms would be used to explain how trees can lift water to heights often more? A) air pressure B)adhesion C) cohesion D) tensile strength E) all of the above Q.24. What is the name for the symbiotic structures consisting of squareroots and fungi? a) squareroot hair b) Mycorrhizae c) Casparian strip d) Endodermis e) Rhizobia Q.25. The passive transport of water across a membrane is called a) Chemiosmosis b) Diffusion c) Osmosis d) Transpiration e) Facilitated diffusion Q.26. The squareroot of a flowering plant absorbs water and mineral ions mainly through a) the epidermis b) the squareroot hairs c) the phloem d) the xylem e) all of the a

Answer 1

Q.21) Answer is (C) Sieve Tube Elements.......In plants, translocation, i.e. transport of photoassimilated products like sugar, occurs through phloem which is made up of conducting cells called seive elements and companion cells (which are non-conducting).

Q.22) Answer is (D) Guttation.......High root pressure causes water to ascend to leaves from stem through transpiration pull, leading to its loss from leaves in the form of liquid droplets by the process called guttation.

Q.23) Answer is (E) All of the above......Trees can lift water through transpiration pull (Cohesion-Tension theory which was proposed by scientists Dixon and Jolly), according to which water's physical properties (like adhesion, cohesion, surface tension gives water tensile strength) contribute in its upward pull.

Q.24) Answer is (B) Mycorrhizae.......It is the symbiotic association between fungi and roots of vascular plants, in which fungus helps roots to absorb nutrients and in exchange takes carbohydrates from plants.

Q.25) Answer is (C) Osmosis.............Osmosis is the passive transport of water or solvent across semi-permeable membrane (similar to diffusion except that in diffusion solutes are transported).

Q.26) Answer is (B) Root Hairs.........They are the thin single layered epidermal extensions of the roots's zone of differentiation that absobs water and nutrients from surrounding soil.