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Biology > Photosynthesis > Flashcards

Photosynthesis Flashcards

1
Q

What is photosynthesis

A

Process in which plants trap light energy using their chloroplasts to produce energy/food

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2
Q

What is the word equation for photosynthesis

A

Carbon dioxide + water -> glucose + oxygen

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3
Q

Balanced symbol equation for photosynthesis

A

6CO2 + 6H20 -> C6H12O6 + 6O2

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4
Q

Photosynthesis is a endothermic reaction, what is a endothermic reaction

A

Reaction what requires energy to be absorbed to work

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5
Q

When glucose is produced in photosynthesis it is usually converted into what for storage

A

Starch

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6
Q

One way to show that photosynthesis is proving that starch is present in a leaf, what is the method for this experiment for the starch test

A
  • put leaf in boiling water, to kill the leaf and stop further reactions
  • put leaf in a boiling tube with ethanol, place tube in boiling water bath, ethanol will soon start to boil at 78 degrees, thus quick remove the chlorophyll from the leaf

-Dip leaf in boiling water again it make the leaf soft and less brittle

  • spread the leaf on a white tile and add iodine, of the starch is present the iodine will turn from yellow-brown to blue-black
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7
Q

Before carrying out experiments into photosynthesis what is it necessary to do

A

Destarch the plant, this involves leaving it in darkness for 48 hrs.

(To ensure reaction on what you are finding only occurs in the investigation)

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8
Q

Steps to show light is needed for photosynthesis

A
  • destarch plant
  • partially cover leaf with foil
  • leave in bright light for at least 6 hrs
  • test the leaf for starch (method stated in other flash card )
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9
Q

Steps to show chlorophyll is needed for photosynthesis

A
  • destarch variegated leaf
  • put it in bright light for at least 6 hrs
  • test for starch (method in other flash card)
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10
Q

Steps to show carbon dioxide is needed for photosynthesis

A
  • destarch plant
  • set up a plant covered with a clear plastic bag, seal it with an elastic band ans place sodium hydroxide solution inside the bag with the plant, to absorb ant carbon dioxide inside the bag.

-leave the plant in bright light for at least 6 hrs

  • test one of the leaves for starch (method in other flash card)
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11
Q

How to show oxygen us produced in photo synthesis

A

-Set up a beaker with water and a water plant inside,

-turn a funnel upside down and place it on top of the plant

  • place test tube on top of upside down funnel to collect oxygen bubbles
  • place in bright light for at least 6 hrs

We can then show oxygen bubbles are produced and place a glowing splint in the test tube and it will relight.

We can also use this same setup to measure different rates of photosynthesis with different light intensities by moving a lamp. The rate of bubbles produced will show the change

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12
Q

Limiting factors of photosynthesis

A

Light

Carbon dioxide

Temperature

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13
Q

Hydrogen- carbonate *(bicarbonate) indicator is red what colour does it turn with increased and decreased carbon dioxide levels

A

MY LIPS (more yellow) (less is purple)

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14
Q

Does the epidermis have chloroplasts

A

No

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15
Q

Does the palisade mesophyll layer have chloroplasts

A

Yes many

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16
Q

What does the spongy mesophyll layer have

A

Intercellular airspace’s and fewer chloroplasts

17
Q

3 adaptations a leaf has for light absorption

A
  • large SA
  • thin, transparent cuticle
  • presences of many tightly packed palisade mesophyll cells, end on to the upper surface with many chloroplasts rich in chlorophyll
18
Q

3 adaptations a leaf has for gas exchange -

A
  • spongy mesophyll cells have a large SA for gas exchange
  • intercellular air spaces in “” allow CO2 to enter and oxygen to leave the photosynthesising cells which are mainly concentrated in the palisade layer
  • stomata allow co2 and o2 to enter the leaf; guard cells can open and close the stomata pore (in many the guard cells are open during the day and close at night)
19
Q

What is the waxy cuticle for

A

Prevents evaporation and acts as a physical defence against microorganism infection

Biology (6 decks)

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