Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Botany 2 MARINE > Aquatic Fungi > Flashcards

Aquatic Fungi Flashcards

1
Q

Are aquatic fungi eukaryotic or prokaryotic?

A

Eukaryotic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Do aquatic fungi have chlorophyll?

A

They are transparent, no chlorophyll present

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What part do aquatic fungi play in the foodweb?

A

Decomposers- important nutrient recyclers

Feed on dead organic matter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are types of feeding strategies do aquatic fungi employ?

A

Saprobes- feed on dead matter
Symbionts- live in co-oporation with other organisms
Parasitic- prey on hosts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are fungi cell walls composed of?

A

Chitin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What product do they store in their cells?

A

glycogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are hyphae

A

Filamentous branching threads- how growth occurs

  • White/colourless
  • (0.5 - 100 um thick)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

List the key characteristics of aquatic fungi

A
  • Apical Growth
  • Asexual reproduction (budding/spores)
  • Sexual reproduction (Biphasic alternation of generation)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are fungi with no septa called?

A

Aseptate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Describe the characteristics of the hyphal tip

A

-Structurally weak and the area behind it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What are phylum chytridiomycota?

A

Chytrids- Flagellated Moulds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Characteristics of chytridiomycota.

A
  • Thallus
  • Single celled organisms
  • No true mycelium
  • Cell wall contain cellulose instead of chitin
  • Parasitic and saprophytic species
  • Some develop aseptate multi-nucelate mycelia
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is a thallus?

A

Colourless, spherical cell with branching threads called rhizoids
-Function is to penetrate a host or non-living substratum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What role can parasites play in a food web?

A
  • Allow energy transfer between trophic levels
  • Predators can easily target infected prey
  • Predators prey on free-living stages of parasites
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does the chytrid parasite Zygorhizidium planktonicum prey on?

A

Asterionella formosa (araphid diatom)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the haplontic life cycle?

A

It involves both asexual and sexual phases within the life cycle

17
Q

List the steps of the asexual life cycle of Zygorhizidium planktonicum.

A
  • Step 1- Attachment
  • Step 2- Encystment
  • Step 3- Germ tub formation
18
Q

How does Zygorhizidium planktonicum carryout asexual reproduction?

A

Uni-flagellated zoospores

19
Q

Describe Step 1 in the Zygorhizidium planktonicum asexual reproduction?

A

Zoospores attach to the cell wall of Asterionella formosa

20
Q

Describe Step 2 in the Zygorhizidium planktonicum asexual reproduction?

A
  • A thickened wall is formed around the zoospore forming a cyst
  • If infection is successful, the cyst develops into a mature sporangium
21
Q

Describe Step 3 in the Zygorhizidium planktonicum asexual reproduction?

A
  • Germ tube develops and enters host algal cell, totally dependant on the host cell for nourishment
  • New uni-flagellated zoospores are released
  • During dispersal, zoospores depend on internal energy storage
  • Capable of infecting a new host diatom
22
Q

What triggers Zygorhizidium planktonicum to reproduce sexually?

A

Adverse environmental conditions

23
Q

How does Zygorhizidium carry out sexual reproduction?

A

Via gametangial copulation

24
Q

What is the process of sexual reproduction in Zygorhizidium?

A
  • Female thalli are large and develop from a zoospore
  • Male thalli are small
  • Zoospores empty their contents into the female thallus via conjugation tubes
25
Q

What happens after fertilisation in Zygorhizidum?

A

Female thallus is fertilised
Develops in thick-walled resting spore (2n)
Germination and meiosis form haploid zoospores

26
Q

List the challenges Zygorhizidium face in the wild?

A
  • Rapid change in diatom population size
  • Small moving targets (prey)
  • Resistance to infection of host
  • Hypersenstivity response
  • Host rapidly dies and not enough time for life cycle of parasite to finish
27
Q

List the adaptations of Z. planktonicum to survive

A
  • Gains nutrient from diatom quickly
  • Faster growth rate than diatom
  • Large number of motile spores to increase change of infection
  • Resting stages- can survive adverse conditions
  • Rapid population growth in good conditions

Botany 2 MARINE (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions