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AGRC 111 > plant organs: Leaves > Flashcards

plant organs: Leaves Flashcards

1
Q

what are the functions of leaves

A

photosynthesis, transportation, respiration, and storage

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2
Q

what is open during the day to collect CO2 to fix during photosynthesis

A

the stomata

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3
Q

what is important in determining the amount of sunlight a plant can intercept

A

leaf area and arrangement

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4
Q

what is transportation

A

the movement of water from the inside of the leaves to the atmosphere outside the leaves

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5
Q

how much percent of water is taken up and lost through transportation

A

97%

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6
Q

what regulates the plant’s water balance

A

guard cells

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7
Q

how is a large amount of water lost to the atmosphere

A

the stomata stay open to collect CO2 and by doing so a large amount of water is lost to the atmosphere

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8
Q

what are the benefits of transportation

A

cools the plant, changes the osmotic pressure of cells, and enables movement of nutrients and water from roots to shoots

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9
Q

what are some examples of plants that have become specialized in using leaves as food storage sites

A

spinach, lettuce

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10
Q

what are underground leaves

A

bulbs ex. onion, garlic

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11
Q

what is the petiole

A

the stock that joins the leaf to the stem

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12
Q

in some dicots what function can the petiole also carry out

A

become enlarged to store food

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13
Q

what are the two main parts the dicot leaves consist of

A

the blade which is the green part of the leaf.

the petiole, which is the stalk that attaches the leaf to the blade of the stem

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14
Q

in dicots what kind of vein arrangement can we have in blades

A

branched or netted in arrangement

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15
Q

what is the petiole

A

the stock which attaches the leaf blade to the stem

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16
Q

what are plants with no noticeable petiole called

A

sessile

17
Q

what are stipules

A

leaf-like appendages found at the point where the petiole and stem join. they look very similar to the true leaves or leaflets but arent

18
Q

what does monocot leaves consist of

A

blade, sheath, ligule, and auricles

19
Q

what are the characteristics of a monocot blade

A

the true tissue of the leaf, generally very long and narrow compared to dicots, veins are parallel in monocots

20
Q

in monocots what is the sheath

A

the structure that surrounds the stem. the sheath attaches the blade to the stem. how sheat surrounds the stem can be an identifying factor in monocots

21
Q

in monocots what is the ligule

A

it is a thin filamentous appendage on the inside between the leaf blade and stem. the shape and size is used to identify species

22
Q

in monocots what is the auricle

A

the lobes which arise at the base of the blade/top of the sheath and clasp the stem. the shape and size is also used to identify species

23
Q

how are leafs usually arranged in monocots

A

the are usually arranged alternatley in this there is only one leaf per node.

at one node the leaf comes one way and at the next node the leaf comes out the opposite way

24
Q

in monocots what is the flag leaf

A

it is the final leaf to emerge. it may be shaped differently from the others

25
Q

in dicots what is the alternate leaf arrangement

A

only one leaf per node

26
Q

in dicots what is an opposite arrangement

A

coming off the stem directly apposite for each other at a node (in pairs)

27
Q

in dicots what is a whorled leaf arrangement

A

several leaves coming from one node

28
Q

what is simple leaves in dicots

A

has one blade (one leaf coming from the petiole)

29
Q

what is compound leaves in dicots

A

has two or more leaflets (multiple leafs coming from the petiole

30
Q

what vein structures can simple leaves have

A

pinnate and palmate

31
Q

what is the vein structure of pinnate

A

the leaf has a main rib with veins branching from the rib

32
Q

what is the vein structure of palmate

A

veins radiate from a central point

33
Q

what leaf arrangements can compound leaves have

A

pinnate and palmate

34
Q

what is the leaf arrangement in pinnate compound leaves

A

the leaf has a main rib with leaflets branching off

35
Q

what is the leaf arrangement in palmate compound leafs

A

leaflets radiate from a central point at the end of the petiole

36
Q

what is trifoliate

A

special arrangement of compound leaves there are three leaflets coming from the end of the petiole

37
Q

what is the leaf shape

A

how the entire leaf is shaped

38
Q

what is leaf margin

A

how the edge of the leaf appears

AGRC 111 (39 decks)

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