Transport in Plants(Xylem and Phloem structure and function)

The cellular components that constitute xylem vessels are called _______________________, and they are joined together end to end to form long tubes that allow _____________________ and _______________________ to travel over long distance

• Vessel elements, water, assimilates

• Vessel cells, water and assimilates

• Transport elements, mineral ions and assimilates

• Vessel elements, water, mineral ions

Within xylem vessel, adjacent vessel elements do not have _____________________ between them, and this will ensure ___________________________ flow of materials within the xylem

• division walls, differentiated

• cross walls, uninterrupted

• cross walls, interrupted

• sieve plates, uninterrupted

___________________ is a waterproof substance in the stem of plants that minimize the loss of water through the walls of the xylem

• Ligin

• Superin

• Suberin

• Lighnin

Lignin helps to prevent the ____________________ of the xylem vessels as a result of ________________ tension within the xylem, and this tension that is caused by the ___________________ exerted on water molecules within the xylem

• collapse, high, root pressure

• rupture, high, transpiration pull

• bending, high, root pressure

• collapse, high, transpiration pull

The xylem can transport large volume of water per time because it has a wide ___________________

• lumen

• pit

• pith

• cross wall

The walls of the xylem vessels contains numerous pits which allow _______________________ movement from one xylem vessel to a neighbouring ___________ vessel

• lateral, zylem

• horizontal, xylem

• upwards, phloem

• lateral, phloem

The absence of which of the following makes it impossible for xylem vessel elements to synthesise proteins?

• nucleus

• enzymes

• smooth ER

• cross walls

Xylem pits possess __________________ meshwork within them but they lack __________________

• lignin, cellulose

• celulose, lignin

• lignin, celulose

• cellulose, suberin

Cellulose meshwork on the plant cell wall makes the cell wall ________________, while lignin makes the cell wall ________________________

• freely permeable, impermeable

• freely permeable, semipermeable

• impermeable, freely permeable

• semipermeable, impermeable

Numerous tiny ____________________ vessels within the roots of plants join up to form large vessels, collecting large amount of water and dissolved substances and transporting them towards the leaves, ________________, and ________________ of plants

• xylem, roots, stem

• phloem, fruit, flower

• xylem, fruits, stem

• xylem, fruits, flower