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Biology > photosynthesis > Flashcards

photosynthesis Flashcards

1
Q

what is the chlorophyll

A

A green coloured chemical in chloroplasts that is responsible for absorbing light energy during photosynthesis.

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2
Q

what is a green coloured chemical in chloroplasts that is responsible for absorbing light energy during photosynthesis.

A

the chlorophyll

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3
Q

what is the chloroplasts

A

A structure in the cytoplasm of plant cells which contains chlorophyll and carries out photosynthesis

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4
Q

what is a structure in the cytoplasm of plant cells which contains chlorophyll and carries out photosynthesis

A

the chloroplasts

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5
Q

what is the compensation point

A

When the environmental conditions plant is growing a in (usually the levels of light) produce rates of photosynthesis and respiration that are equal i. e. there is no net gas exchange.

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6
Q

what happens When the environmental conditions plant is growing a in (usually the levels of light) produce rates of photosynthesis and respiration that are equal i. e. there is no net gas exchange.

A

the compensation point

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7
Q

what is the cuticle

A

The waxy layer on the outside surface of a plant epidermis that allows light through and reduces water loss.

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8
Q

what is the waxy layer on the outside surface of light through and reduces water loss. a plant epidermis that allows

A

the cuticle

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9
Q

what does it mean by de-starch

A

The procedure that removes starch from plant leaves

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10
Q

what is the procedure that removes starch from plant leaves

A

de-starch

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11
Q

what is the epidemies

A

An outer layer of cells

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12
Q

what is an outer layer of cells

A

the epidemies

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13
Q

what is gas exchange

A

The movement of gases between an organism and its surroundings.

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14
Q

what is the movement of gases between an organism and its surroundings.

A

gas exchange

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15
Q

what is the limiting factor

A

Any factor which is at a level less than its optimum which slows or limits
a process, e.g. photosynthesis.

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16
Q

what do you call when any factor which is at a level less than its optimum which slows or limits
a process, e.g. photosynthesis.

A

the limiting factor

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17
Q

what is the palisade

A

The upper of the two layers of mesophyll cells in the centre of a leaf. The cells are closely packed end on to the upper surface and contain many chloroplasts. They are the main site of photosynthesis.

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18
Q

what is the upper of the two layers of mesophyll cells in the centre of a leaf. The cells are closely packed end on to the upper surface and contain many chloroplasts. They are the main site of photosynthesis.

A

the palisade

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19
Q

what is photosynthesis

A

The chemical process in green plants which uses light energy to convert carbon dioxide and water into sugars and oxygen.

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20
Q

what is the chemical process in green plants which uses light energy to convert carbon dioxide and water into sugars and oxygen.

A

photosynthesis

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21
Q

what is the spongy mesophyll

A

The lower of the two layers of mesophyll cells in the centre of a leaf. The cells are loosely arranged with air spaces in between them. They are the main site of gas exchange,

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22
Q

what is the lower of the two layers of mesophyll cells in the centre of a leaf. The cells are loosely arranged with air spaces in between them. They are the main site of gas exchange,

A

the spongy mesophyll

23
Q

what is a stoma

A

The small pores in the surface of plant leaves.

24
Q

what is the small pores in the surface of plant leaves.

A

a stoma

25
Q

what is the word equation for photosynthesis

A

carbon dioxide + water =sunlight= glucose + oxygen

26
Q

what is the chemical balanced equation for photosynthesis

A

6Co2 + 6H2O = C6H12O6 +6O2

27
Q

what 2 chemicals do plants take in

A

carbon dioxide and water

28
Q

what gas does plants release

A

oxygen

29
Q

How do you De-starch a Plant

A

Place it in a dark cupboard for 48 hours

30
Q

Chemical Used for starch test

A

Iodine Solution

31
Q

What type of Reaction is Photosynthesis

A

Endothermic

32
Q

What Colour will Hydrogen Carbonate Indicator turn if there is more CO2 and Why?

A

Yellow
Rate of Respiration>Rate of Photosynthesis

33
Q

What Colour will Hydrogen Carbonate Indicator turn if there is less CO2 and Why?

A

Purple
Rate of Respiration<Rate of Photosynthesis

34
Q

What does it mean if Hydrogen Carbonate Indicator turns Red

A

Rate of Respiration=Rate of Photosynthesis

35
Q

How is Leaf Adapted for Gas Exchange?

A

1)Stomata=Allows gases to enter and leave the leaf
2)Air Space= allows gases such as CO2 and O2 to diffuse

36
Q

How is Leaf Adapted for Light Absorption?

A

1) The cuticle is transparent which allows light to pass through
2)Has chlorophyll which absorbs/traps sunlight

37
Q

What Chemical Absorbs Carbon Dioxide from the Air?

A

Sodium Hydroxide

38
Q

What is it called when the Rate of Respiration=Rate of Photosynthesis

A

Compensation point

39
Q

explain the starch test for a plant leaf

A
  1. Remove a leaf from a plant and place in boiling water for at least 30 seconds.
  2. The leaf is then placed in boiling ethanol.
  3. The leaf should then be dipped in water again.

4.The leaf is then spread out on a white tile or petri dish and iodine is added to

    • If starch is present the yellow-brown iodine will turn the starch blue-black.
40
Q

what is the point of step 1 by the process to Remove a leaf from a plant and place in boiling water for at least 30 seconds.

A

soften the leaf and breaks down the membranes

41
Q

what is the point of step 2 of by placing the leaf in boiling ethanol

A

to remove the green chlorophyll - allows us to see any colour change of iodine

42
Q

what is the point of step 3 by dipping the leaf back into water again

A

to remove the ethanol

43
Q

what is the point of step 4 when the leaf is spread out on a white tile or petri dish and iodine is added to

A

iodine is an indicator

44
Q

what is the point of step 5 of checking the colour

A

if the iodine shows up as blue-black then there is starch or the leaf is photosynthesising

45
Q

what is sugars used for in a plant

A

it is used to make new cell wall, respiration, used to help the plant make proteins and fats and it is used to turn back into starch to be stored

46
Q

how can you measure the rate of photosynthesis

A

Pondweed (Elodea) is frequently used to compare photosynthesis rates in different light

47
Q

what is the key points of measuring Pondweed

A

Key points: measuring the rate of Photosynthesis by Counting the bubbles Per minute.
You can change light intensitiy and measure its effect by moving the lamp Waiting are recovering.

48
Q

why is counting all the bubbles in a pondweed not a good way of measuring oxygen released

A

not all the bubbles may be pure it may also be carbon dioxide and it may be different sizes

49
Q

what is the lamp for

A

the lamp is there for the light not for the heat

50
Q

why id extra carbon dioxide added to a green house

A

maximum PSN, MAX growth

51
Q

why is carbon dioxide closed of 1 hour before night time

A

is there is no sun extra carbon dioxide won’t help it photosynthesis and be a waste of money

52
Q

why is the windows opened in a green house

A

to help with ventilation

53
Q

word equation for respiration

A

glucose + oxygen = carbon dioxide + water

Biology (6 decks)

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