Lab 5 Flashcards

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1
Q

what are the primary functions of roots?

A

anchor the plant in the soil and absorb water and essential minerals

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2
Q

what does the root system of a plant consist of?

A

a primary roots (which develops from the radicle of the embryo), which gives rise to lateral roots. each root has a root apical meristem, protected by a root cap at its tip

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3
Q

what is the tap root system?

A

usually found in eudicots and conifers, has a large dominant primary root and several lateral roots (food storage is often important in tap roots)

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4
Q

what is the fibrous root system?

A

common in monocots, has many roots of equal size and no detectable primary root (well adapted for anchorage)

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5
Q

what do the cells of the root cap produce?

A

mucigel, which contains sugars, vitamins, amino acids, and enzymes

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6
Q

what is the function of mucigel?

A

lubricates the root for its passage through the soil and helps prevent water loss from the soil

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7
Q

what are statoliths?

A

specialized amyloplasts in the root cap that move in response to gravity

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8
Q

what are the five important functions that roots serve in the plant body?

A
  1. anchorage
  2. absorption
  3. storage
  4. transport
  5. growth
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9
Q

what are adventitious roots?

A

roots that develop from stems or leaves rather than from other roots

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10
Q

what are aerial roots?

A

almost always adventitious, produced above ground, and can be specialized for a variety of functions

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11
Q

what are haustorial roots?

A

roots that glue themselves to the stems of trees and are specialized to penetrate the xylem of their host for a water source (mistletoe)

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12
Q

what are aerating roots or pneumatophores?

A

roots that project up out of the water or wet soil for aeration

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13
Q

what are propagative roots?

A

roots that form shoot buds along their length from which new shoots can grow (asexual reproduction) (canada thistle and trembling aspen)

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14
Q

what are storage roots?

A

roots modified to store large amounts of food or water (carrots, radishes, etc..)

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15
Q

what are root nodules?

A

enlarged structures that form as a result of bacteria invading root hairs and growing in the cortex tissue of the root (found in legumes)

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16
Q

what does the cortex (ground tissue in roots) consist of?

A
  • exodermis: a thin layer of parenchyma cells that contain suberin
  • storage parenchyma: a thick layer of large diameter, thin-walled parenchyma cells packed with starch grains. intercellular spaces are numerous
  • endodermis: thick-walled cell layer that forms the innermost layer of the cortex and separates the cortex from the central vascular cylinder (the stele)
17
Q

what is the function of the casperian strip?

A

prevents the passage of water from the cortex to the stele through the cell wall area

18
Q

what is the vascular cylinder (stele) composed of?

A

vascular tissue (xylem and phloem) and a layer of associated ground tissue called the pericycle

19
Q

what is the pericycle?

A

a meristematic layer of ground tissue in the stele which can give rise to lateral roots

20
Q

what is the pith?

A

a central region of ground tissue in monocot roots that is typically composed of parenchyma