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Life In The Seas And Oceans > Macroalgae > Flashcards

Macroalgae Flashcards

1
Q

What three things is seaweed classified by?

A

Pigments
Storage products
Flagella in spores

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2
Q

What is a frond?

A

Large leaf that is divided on a seaweed

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3
Q

What is the function of the blade on seaweed?

A

It captures light for photosynthesis

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4
Q

What is the stripe on a seaweed?

A

Stalk

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5
Q

What’s a holdfast on seaweed?

A

The root that holds seaweed to the substrate

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6
Q

What is green seaweed called?

A

Chlorophyta

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7
Q

What pigments does chlorophyta (green seaweed) contain?

A

Chlorophyll a and b

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8
Q

What light colours does chlorophyta use?

A

Red and blue light

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9
Q

What is the name for brown seaweed?

A

Phaeophyceae

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10
Q

What pigments does phaeophyceae contain?

A

Chlorophyll c and flucoxanthis

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11
Q

What light colours does phaeophyceae use?

A

Red and blue light but red mainly

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12
Q

What is the name for red seaweed?

A

Rhodophyta

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13
Q

What pigments does rhodophyta contain?

A

Chlorophyll and phycocyann and phycoerythrin

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14
Q

What light colours does rhodophyta absorb?

A

Blue light

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15
Q

What environment does chlorophyta enjoy?

A

Environments with fluctuating salinity and also fresh water.

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16
Q

What is the relation between the three types of seaweed?

A

They’re not closely related.

17
Q

Why is rhodophyta good at CO2 sequestration?

A

It deposits CaCO3 into its cell walks which helps it act as a carbon sink.

18
Q

Name 5 adaptations that help brown algae

A

Really reproductive-dioecious

Forms clumps-reduces evaporation

Grazing resistant

Thick cell walls-stops water loss

Resist desiccation-intertidal

19
Q

What does being intertidal mean in terms of photosynthesis ability?

A

They photosynthesise more when exposed than when they’re submerged because water and particles also absorb light so less is available.

20
Q

Where do brown algae live?

A

Rocky shores

21
Q

What is sea grass classed as and why?

A

A plant because it has a complex root system unlike seaweed.

It has a vascular transport system

Higher cellulose content

22
Q

What are the two stages of reproduction of seaweed?

A
  1. Gametophyte (makes gametes)

2. Sporophyte (makes spores)

23
Q

How does reproduction look in green and brown algae?

A

Green: the same

Brown: different

24
Q

Describe the process of the ulva life cycle and reproduction.

A
  1. Diploid sporophyte produces microscopic zoospores (with 4 flagella)
  2. Zoospores settle after 1 hour
  3. Zoospores germinate and produce the haploid gametophyte stage

Life In The Seas And Oceans (3 decks)

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