B6 animal nutrition Flashcards

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1
Q

define photosynthesis

A
  • process by which plant synthesise carbohydrates from raw materials
  • using energy from light
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2
Q

word equation for photosynthesis

A

carbon dioxide + water –> glucose + oxygen
in the presence of light. and chlorophyll

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3
Q

what is chlorophyll

A
  • green pigment
  • found in chloroplasts
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4
Q

balanced symbol equation for photosynthesis

A

6CO2 + 6H2O –> C6H12O6 + 6O2

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5
Q

what does chlorophyll do

A
  • transfer energy from light into energy in chemicals
  • for synthesis of carbohydrates
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6
Q

what is starch used for (photosynthesis)

A

energy store

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7
Q

what is cellulose used for

A

build cell walls

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8
Q

what is glucose used for (photosynthesis)

A

respiration to provide energy

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9
Q

what is sucrose used for

A

transport in phloem

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10
Q

what is nectar used for

A

attract insects for pollination

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11
Q

what are nitrate ions used for

A

making amino acids

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12
Q

what are magnesium ions used for

A

making chlorophyll

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13
Q

how does light intensity affect rate of photosynthesis

A
  • light intensity inc, photosynthesis inc
  • up to certain point, any further inc will not inc rate
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14
Q

how does co2 conc affect photosynthesis

A
  • conc inc, photosynthesis inc
  • up to certain point, any further inc will not inc rate
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15
Q

how does temp affect photosynthesis

A
  • inc as temp inc
  • up to point, then decreases
  • because of denaturation of enzyme (photosynthesis is enzyme catalysed)
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16
Q

how does hydrocarbonate indicator solution show how light intensity affects gas exchange in aquatic plant

A
  • dark condition: respiration > photosynthesis, orange (high conc co2)
  • light condition: photosynthesis > respiration, purple (low conc)
  • control: equal, red (normal atmospheric conc)
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17
Q

adaptations for photosynthesis

A

leaves have large surface area and are thin

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18
Q

how does large leaf surface area improve photosynthesis

A
  • larger area exposed to sunlight & air
  • easier absorption of these materials
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19
Q

how does thin leaf improve photosynthesis

A
  • co2 from air diffuses quickly to photosynthetic cells
  • light penetrates easily
20
Q

function of cuticle

A

stop water from evaporating from leaf

21
Q

adaptation of cuticle

A

waxy layer

22
Q

function of chloroplast

A

site of photosynthesis

23
Q

adaptation of chloroplast

A
  • contain chlorophyll to absorb light
  • contain enzymes and structures needed for photosynthesis
24
Q

function of upper epidermis

A

protect inner cells

25
Q

adaptation of upper epidermis

A
  • thin layer wo chloroplasts
  • let light pass thru for photosynthesis
26
Q

function of palisade mesophyll layer

A

tissue in which photosynthesis happens

27
Q

adaptation of palisade mesophyll layer

A
  • box-shaped cells packed closely tg
  • each cell has many chloroplasts to absorb more light
28
Q

function of xylem

A

carry water and mineral ions from roots to leaf

29
Q

adaptations of xylem

A
  • made from dead cells
  • form hollow, waterproof tubes thru which water passes
30
Q

function of phloem

A

carries sucrose away from leaf

31
Q

adaptations of phloem

A

consists of
- sieve tubes (thru which sucrose is transported)
- companion cells (provide energy for transport)

32
Q

function of vascular bundle

A

contain xylem and phloem tissues

33
Q

function of lower epidermis

A

protect inner cells

34
Q

adaptations of lower epidermis

A
  • thin layer
  • does not contain chloroplasts (except guard cells)
  • lets light pass thru for photosynthesis
35
Q

function of guard cell

A
  • work in pairs
  • control size of opening of a stoma
36
Q

adaptations of guard cell

A
  • entry/loss of water (osmosis) changes shape
  • lead to opening/closing of stoma
37
Q

function of stomata

A

control diffusion of water vapour and gases in/out of leaf

38
Q

adaptations of stomata

A
  • size of opening changes
  • in response to internal/external environments of plant
39
Q

function of air spaces

A

allow diffusion of gases throughout leaf

40
Q

function of spongy mesophyll layer

A

site of gas exchange

41
Q

adaptations of spongy mesophyll layer

A
  • cells loosely spaced
  • creates air spaces to allow diffusion of gases throughout leaf
42
Q
A
43
Q
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44
Q
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45
Q
A