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- Multiple ChoicePlease save your changes before editing any questions.
Xylem
is a type of vascular tissue.
is a dead tissue.
is composed of xylem vessels.
is responsible for translocation of organic nutrients.
- Multiple ChoicePlease save your changes before editing any questions.
Xylem vessel
has an empty lumen with no cell content.
has end wall degenerated and vessels are joined end to end.
has thin cellulose cell wall.
is responsible for the upward transport of water.
- Multiple ChoicePlease save your changes before editing any questions.
The functions of xylem is/are
to transport of water and mineral salts.
to translocate organic nutrients.
to provide support to the plant part by the rigidity of cell wall.
to provide metabolic energy.
- Multiple ChoicePlease save your changes before editing any questions.
Phloem is
a dead tissue.
composed of sieve tube cells and companion cells.
responsible to provide support to the plant part.
responsible to transport organic nutrients from leaves to other plant parts.
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Phloem is responsible
for downward translocation of organic nutrients to root cell.
for upward translocation of minerals to stem tip.
for providing support to the plant part.
for providing water to the neighbouring cells.
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As compared with xylem vessels, phloem sieve tube cells
have nuclei.
have cytoplasm.
have mitochondria.
have empty lumen.
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A young seedling will turn yellow sooner or later if phloem is damaged. This is because
no minerals can be transported by the damaged phloem.
no sugars can be translocated by the damaged phloem to root cells.
chlorophylls will be disintegrate if phloem is damaged.
not enough magnesium is transported to new cells for synthesizing chlorophylls.
- Multiple ChoicePlease save your changes before editing any questions.
Upward movement of water by a plant will NOT be affected by extremely high temperature because
uptake of water by root cells depends on osmosis.
upward movement of water depends on transpiration pull.
enzymes are not involved in the uptake and transport of water across the plant.
xylem is involved and it is a dead tissue.