Transport Of Plant Flashcards

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1
Q

Role of xylem
In Plant?

A

1.made of hallow dead cells joined end to end
2.end walls of cells disappeared, long open tube is formed
3.run from roots of plants right up through stem branch out into every leaf
4.no cytoplasm
5.walls made of cellulose and lignin

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2
Q

Function of phloem

A

Transport sucrose and ammino acid up and down

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3
Q

Why walls of xylem made of cellulose and lignin?

A

Help xylem vessel keep plant upright

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4
Q

Functions of xylem?

A

Transport water and minerals up from root to other plants of the plant

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5
Q

What is meant by transpiration?

A

Loss of water from plant leaves by evaporation of water at the surfaces of the mesophyll cells followed by loss of.water vapour through stomata by diffusion

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6
Q

What is meant by transpiration stream?

A

Water in leaves will travel to the cells by osmosis to replace it

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7
Q

What meant by vyscular bundle?

A

Group of specialised tissue ,xylem and phloem that transport water,dissolved salts, food throughout plant

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8
Q

Importance of transpiration

A

1.water for keeping plant turgid
2.water for photosynthesis
3. transport of mineral ions
4.keeping leaves cool

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9
Q

Usauge of nitrate

A

Ammino acid for protein

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10
Q

Why transpiration keep leaves cool by evaporative cooling?

A

To maintain optimum temperature of enzyme

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11
Q

How water is absorbed by root hair cell?

A

Water movement by osmosis high water potential to low water potential through semi peremeable membrane

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12
Q

Position of vascular bundle in root?

A

At center

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13
Q

Position of vuscular bundle in shoot?

A

near outside edge

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14
Q

Position of vascular bundles in leaves?

A

Jn mesophyll tissue

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15
Q

Why shoot arranged in a ring near outside edge?

A

Help to support stem

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16
Q

Explain Conditions that affect transpiration rate

A

Temperature as it increase transpiration increase
As humidity increase transpiration decrease
As wind speed increase transpiration increase
As light intensity increase transpiration increase