2g - Gas Exchange Flashcards

1
Q

What does the net exchange of gases depend on?

A

Light Intensity

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2
Q

During the day, do plants make more or less oxygen than they use in respiration?

A

More

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3
Q

During the day, do plants use up more or less CO2 than they produce?

A

More

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4
Q

At night do plants take in o2 or release it?

A

Take it in for respiration

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5
Q

Why is leaves being broad an advantage?

A

So they have a large surface area for diffusion

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6
Q

Why is leaves being thin an advantage?

A

So there is short diffusion pathway for the gases

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7
Q

During the day are the stomata open or close?

A

Open to allow CO2 in for photosynthesis

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8
Q

During the day, do the stomata let water in or out?

A

Out

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9
Q

At night are the stomata open or closed?

A

Closed to stop water loss (don’t need to let co2 in)

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10
Q

What happens to guard cells as they open the stomata?

A

They increase in volume

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11
Q

What happens to guard cells as they close the stomata?

A

They decrease in volume

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12
Q

What colour is hydrogen carbonate indicator in high co2 levels?

A

Yellow

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13
Q

What colour is hydrogen carbonate indicator in low co2 levels?

A

Purple

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14
Q

What colour is hydrogen carbonate indicator in normal CO2 levels?

A

Red

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15
Q

What’s the function of the ribs?

A

protects internal organs such as the lungs

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16
Q

What’s the function of the intercostal muscles?

A

control the movement of ribs - causing inhalation and exhalation

17
Q

What’s the function of the diaphragm?

A

Helps change the volume of the thorax

18
Q

What’s the function of the trachea

A

Windpipe that connects the mouth and nose to the lung

19
Q

What’s the function of the alveoli?

A

Tiny air sacs where gas exchange take place

20
Q

What’s the function of the pleural membranes ?

A

Lubricates the lungs to reduce friction

21
Q

Describing breathing IN:

A
  • intercostal muscles + diaphragm CONTRACT
  • rib cage moves UP and OUT
  • Thorax INCREASES
  • Pressure DECREASES
  • Air is drawn IN to lungs
22
Q

Describe breathing OUT:

A
  • intercostal muscles + diaphragm RELAX
  • rib cage moves DOWN and IN
  • Thorax DECREASES
  • Pressure INCREASES
  • Air is drawn OUT of lungs
23
Q

How are alveoli adapted for gas exchange?

A
  • large surface area
  • thin walls
  • moist
  • good blood supply
  • permeable