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Bio S2 > Photosynthesis > Flashcards

Photosynthesis Flashcards

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Biology 101 flashcards
1
Q

What is the test for starch?

A

It is when the iodine solution from red/brown to blue/black when starch is present in the leaf.

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2
Q

Why does a leaf get boiled in water?

A

To burst cell membranes.

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3
Q

What happens when a leaf gets boiled in ethanol?

A

The chlorophyll dissolved inside the ethanol.

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4
Q

Is light necessary for photosynthesis and what is the control for it?

A

Yes.

The control would have a bell jar covered with foil to keep out light or you could place the leaf in dark for 2 days to remove any starch present

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5
Q

When you tested to see if light was needed for photosynthesis, why was the plant placed in the dark for 2 days?

A

To remove any starch present

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6
Q

When you put iodine solution on the covered part of the leaf, why didn’t it turn blue/black?

A

Light can’t reach the covered part of the leaf so it can’t photosynthesise.

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7
Q

Does a plant need carbon dioxide to photosynthesise

A

Yes.

The control would have a chemical that takes in all the carbon dioxide. The normal one would replace the chemical with water to make sure no other variable is being changed

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8
Q

Is chlorophyll needed to produce starch and what would the control be?

A

Yes.

The control would take a variegated leaf. The green part of the leaf has starch which photosynthesised and white part has no starch present, it did not photosynthesise

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9
Q

What is the word equation for photosynthesis?

A

Water + carbon dioxide (with the presence of light and chlorophyll) can produce oxygen + glucose

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10
Q

Where does water enter the plant and where does it move into within the plant?

A

Enters from the soil and through the roots

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11
Q

Where does carbon dioxide enter the plant?

A

Through the stomata between the guard cells

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12
Q

What is the important by-product of photosynthesis?

A

Oxygen

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13
Q

What is the storage carbohydrate of plants?

A

Starch

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14
Q

What do leaves produce to provide energy for growth?

A

Glucose

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15
Q

What is the structural carbohydrate that plants use to make cell walls?

A

Cellulose

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16
Q

What do green plants convert light energy into?

A

Chemical energy

17
Q

What are reasons why organisms are important?

A

They produce high energy foods like glucose and starch
They produce oxygen and take in carbon dioxide to give us the air we breathe
They improve soil quality, which is vital to be able to grow quality plants for survival
They have medicinal uses, eg: aspirin
They have aesthetic uses

18
Q

Why are wide leaves good?

A

A large surface area of a leaf helps to absorb more light energy

19
Q

Why is it good to have thin leaves?

A

It helps Carbon dioxide get from the bottom to the top of the leaf for photosynthesis

20
Q

What is the function of the upper epidermis?

A

Protect inner layers
Transparent to let light through

21
Q

What is the function of the LOWER epidermis?

A

Protect inner layers
Transparent to let light through
Contains stomata between guard cells that open and close to CONTROL gas exchange and water loss

22
Q

What is the function of the Palisade Mesophyll cells?

A

Main site of photosynthesis (full of chloroplasts)

23
Q

What is the function of the spongy mesophyll cells?

A

Loosely arranged with air spaces to let CO2 and O2 to move into and out the cells.
Also carries out photosynthesis

24
Q

What is the function of the stomata?

A

THESE ARE NOT CELLS
Pores that open and close to control gas exchange and water loss
They are open during the day and are closed during the night

25
Q

What is the function of the guard cells?

A

Changes the shape of the stomata to open and close to CONTROL gas exchange and water loss.

26
Q

What is the function of the moist air spaces?

A

Increases the efficiency of gas exchange

27
Q

What is iodine solution?

A

Reagent used to test for the presence of starch.

28
Q

What is chlorophyll?

A

Green pigment in chloroplasts that trap light energy and is needed for photosynthesis

29
Q

What are chloroplasts?

A

Organelle that is the main site of photosynthesis

30
Q

Do green plants release oxygen when carrying out photosynthesis

A

Yes, it is released into the air as a by product of photosynthesis

31
Q

What are the factors needed for photosynthesis?

A

Carbon dioxide, light energy, water and chlorophyll.

32
Q

What is glucose?

A

A simple sugar made by photosynthesis.

33
Q

What is a control?

A

Something that shows that the variable you are testing causes the effect you see.

34
Q

What is a variegated leaf?

A

A leaf that bears more than one colour and in some parts of the leaf, has no starch/chlorophyll

35
Q

What is glucose converted into?

A

Starch (as an energy store)
Cellulose (for plant cell walls) - structural carbohydrate
Respiration

Bio S2 (4 decks)

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