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Ecology and evolution > CH.8-Consumers > Flashcards

CH.8-Consumers Flashcards

1
Q

What is a consumer?

A

Organism that feeds on other organisms

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2
Q

All consumers are ___ since their carbon source is organic molecules

A

Heterotrophic

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3
Q

What are eukaryotic consumers made up off?

A

All animals, single-celled protists (ciliates, amoebas)

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4
Q

Are bacteria that aren’t parasitic to a host or don’t have symbiotic relationship with a host considered a consumer?

A

NO - need to have host

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5
Q

What are zooplankton? Are they heterotrophic or autotrophic?

A

Small eukaryotic consumers - Heterotrophic (dont make own food)

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6
Q

Are phytoplankton heterotrophic?

A

No autotrophic - make own food through photosynthesis

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7
Q

Kingdom Animalia: 3 characteristics shared by ALL ANIMALS + Additional characteristics

A

1) Eukaryotic cells w/o cell walls
2) Multicellular
3) Heterotrophic

4) Specialized tissues
5) Motility

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8
Q

What are the animal consumer classifications?

A

1) Herbivores (primary)
2) Carnivores
3) Omnivores

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9
Q

Phylogenetic Tree of major animal phyla and name

A

1) Chordata: Fish, amphibians, reptiles, birds, mammals
2) Echinodermata: Starfish
3) Arthropoda: Insects, spiders, crustaceans
4) Nematoda: Roundworms (NO SEGMENTATION)
5) Annelida: Segmented worms
6) Mollusca: Snail, claims, molluscs
7) Platyhelminthes: Flatworms
8) Cnidaria: Jellyfish, corals
9) Sponges (been around longest)

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10
Q

What is common ancestor to all animals?

A

Choanoflagellates

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11
Q

How to characterise animals? explain

A

1) Symmetry
2) Mode of food ingestion
3) Mechanism of exchanging substances between environment and organism’s cell
4) Ability to sense stimuli+respond
5) Mode reproduction

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12
Q

What are the types of symmetry?

A

asymmetrical, radial, bilateral

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13
Q

What are the modes of food ingestion?

A

1) Intracellular:
- Food vacuoles by phagocytosis
- Food ingested withing cells
- Porifera digest like this
2) Extracellular
- SIMPLE GASTROVASCULAR CAVITY: Breakdown food outside cells out gastrovascular cavity
- COMPLEX DIGESTIVE TRACT: 2 openings (mouth + anus) w/ different organs (worms, chordates)

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14
Q

What is open circulatory system?

A

Hemolymph (blood) pumped out of heart through vessels to body tissues ==> exchange
Hemolymph back to heart through pores (ostia) –> Arthropods, molluscs

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15
Q

What are the 2 mechanisms of exchanging substances between environment and organism’s cell

A

1) Simple diffusion of substances across all cell membranes:
Animals who don’t have circulatory systems + live in aquatic habitats (sponges, jellyfis) ==> Ties then to aquatic habitat bc limits size of tissue
2) Circulatory system:
System of vessels that carry nutrients, water, oxygen to all cells and takes waste/CO2 away ==> Driven by heart: Open + Closed circulatory system

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16
Q

What is closed circulatory system?

A

Blood flows through continuous circuit of vessels to and from heart

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17
Q

What are the forms of ability to sense stimuli and respond?

A

1) Simple nerve net: Most primitive
Nerves dispersed, many points of contact
2) Centralized nervous system: Concentrations of nerve cells = Nerve cord ==> Animals w/ bilateral symmetry
3) Cephalization: Concentration of nerve cells in brain that directs the nervous system ==> Organs evolved from this ==> All animals w/ bilateral symmetry

18
Q

T or F: Porifera have nerve cells and can send electrical signals like other animal groups

A

False

19
Q

What are the modes of reproduction?

A

1) Sexual reproduction w/ external fertilization: Adaptation for aquatic environment ==> Sperm + Eggs released into water = relies on currents (overproduction)
2) Sexual reproduction w/ internal fertilization:
Sperm deposited directly withing female reproductive tract (no risk of gametes drying up = more efficient in terrestrial environ.)

20
Q

What are amniotes?

A

Group of animals that evolved form common ancestor that produced amniotic eggs

21
Q

Why are eggs an evolutionary innovation?

A

Embryos can develop on land in fluid filled sac

22
Q

What is the fluid in which the embryo is bathed in?

A

Amniotic fluid

23
Q

3 modes of embryonic development?

A

1) Develop in physical environment (reptiles, birds, monotremes like platypus):
Shell protects form dehydration, vulnerable to changing environment
2) Marsupial mammals (undeveloped and mature in external pouch of mother):
Premature young ==> Go in mother pouch to complete development (milk in there)
3) Placental mammals (mature inside mother uterus):
Embryo’s blood pass through umbilical cord into placenta (exchange gas) ==> No blood mixing

24
Q

What are characteristics shared by ALL chordata during some point of development?

A
  1. Notochord
    Cartilagenous rod (part of vertebral column in vertebrates) ==> Supports body and nerve chord
  2. Dorsal hollow nerve chord
    Develops into central nervous system (brain and spinal cord in vertebrates)
  3. Pharyngeal Slits
    Become gills in aquatic vertebrates and parts of ear, and neck in terrestrial vertebrates.
  4. Muscular Post-Anal Tail
    Sometimes much reduced during embryonic development
25
Q

Chordata move to land: Vertebrae protecting what?

A

Nerve chord

26
Q

Lancelets and tunicates lack ___

A

Jaws and vertebrae

27
Q

Hagfish are the most __ vertebrates with no ___ and ____

A

Basal - jaws - vertebrae

28
Q

Lampreys are jawless but have ____

A

Cartilaginous vertebrae

29
Q

Move to land adaptations: Jaws and mineralized skeleton why?

A

To support body weight out of water

30
Q

Move to land: Gills to lungs
What did most fish have?

A

Swim bladder to help control buoyancy - gas exchange (origin of lungs)

31
Q

Move to land: Fins to limbs with digits
The lobed finned fish transition from fins to limbs why?

A

Support weight and push themselves forward

32
Q

Amphibians: Transitional ___ that live in ___ and on ___

A

Vertebrates - water - land

33
Q

Amphibians: Skins must always remain dry for gas exchange. T or F

A

False - must always be wet

34
Q

Reptiles and birds: Are no longer tied to water?

A

Yes

35
Q

Reptiles and birds: Do they have internal or external fertilization?

A

Internal

36
Q

Reptiles and birds: Do they produce amniotic eggs?

A

Yes

37
Q

Reptiles and birds: Do they have better lungs than amphibians?

A

Yes

38
Q

Reptiles have thick scaly skin that is resistant to ___ that is called ___ that rely on ___ sources of body heat

A

drying out - ectotherms - external

39
Q

Birds that scaly skin, feathers and wings, and bones hollow for flying. These are ____ maintaining internal body temperature that make them more active.

A

Endotherms

40
Q

Mammals have fur/hair and production of milk to ___

A

Nourish young

Ecology and evolution (10 decks)

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