B1.4.1 Photosynthesis Flashcards

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1
Q

What do plants have to take in to make food?

A
  • Carbon dioxide
  • Water
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2
Q

How do plants obtain these substances?

A

C02- diffuses from the air into the plant through the stomata
H20- enters the roots from the soil through root hair cells via osmosis

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3
Q

When these substances react, what do they produce?

A

Oxygen- some is used during respiration, rest is a waste product released back into the environment
Glucose- used as a food source

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4
Q

What is the word equation for photosynthesis?

A

Carbon dioxide + water —> glucose + oxygen

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5
Q

What is the symbol equation for photosynthesis?

A

6CO2+6H20 —> C6H12O6 + 6O2

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6
Q

Where does photosynthesis occur?

A

Inside the plants chloroplasts, meaning that it only occurs in the leaf but slightly in the green stem too

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7
Q

Why are leaves and stems green?

A

Since they contain the pigment chlorophyll in their chloroplasts

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8
Q

Where does glucose store energy?

A

Within it’s chemical bonds

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9
Q

What is the first main stage of photosynthesis reactions?

A

Energy transferred from light splits water molecules into oxygen gas into hydrogen ions

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10
Q

What is the second main stage of photosynthesis reactions?

A

C02 gas combines with hydrogen ions to make glucose

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11
Q

What type of reaction is photosynthesis?

A

Endothermic

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12
Q

What does this type of reaction mean?

A

It means that energy must be transferred from the surroundings to keep it going.

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13
Q

What is a photometer?

A

An instrument for measuring light intensity

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14
Q

What is phototropism?

A

the phenomenon by which the plant bends in the direction of light

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15
Q

What does photoconductive mean?

A

A material whose resistance decreases when it absorbs light

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16
Q

Explain why photosynthesis can’t occur in root cells?

A

They don’t have access to light energy from the sun, which is required for the process of photosynthesis to happen.

17
Q

State three ways plants use glucose:

A
  • In respiration
  • to convert into other sugar molecules
  • to convert into starch, a store of energy
18
Q

Compare respiration and photosynthesis

A

Photosynthesis is the opposite of aerobic respiration, in the sense that their reactions are the other way around. Photosynthesis’ products - carbon dioxide and water - are aerobic respiration’s reactants, and its’ products - glucose and oxygen - are the reactants in photosynthesis.

19
Q

Define photosynthesis

A

The process by which plants harness the energy from the sun and transfer this energy into a useable food source in the form of glucose that can be stored as starch