Algae and Zooplankton

Question 1

Algae

Answer 1

• Photosynthetic
• Not a plant
• Vast majority are aquatic
• Either photosynthetic or eukaryotic
• Phytoplankton

Question 2

Ekaryotic algae can be?

Answer 2

• Multicellular, macroscopic
• Unicellular, colonial, microscopic and plankton

Question 3

Differences between plants and algae

Answer 3

• Plants have evolved from one specific green algae
• Unlike algae, plants have vascular tissues and woody support structures
• Aquatic plants live in the littoral zone or shallow water

Question 4

Zooplankton

Answer 4

• Aquatic
• Planktonic
• Usually very small
• Eukaryotic
• Heterotrophic

Question 5

Metazoans

Answer 5

• Multicellular
• Larger
• “Grazers” or “Predators”

Question 6

Protozoans

Answer 6

• Unicellular
• Smaller
• “microbes” or “zooplankton”

Question 7

Cladocerans

Answer 7

• Mostly freshwater
• 0.2-6mm
• Herbivorus filter feeders
• Major grazers of algae
• Major fish food

Question 8

How do cladocerans avoid predation?

Answer 8

• Transparent bodies
• Migrate vertically between water layers
• Big hard-to-eat helmet

Question 9

Cladoceran reproduction

Answer 9

• Cycles between asexual and sexula reproduction
• Asexual eggs immediately develop into tiny versions of adults
• Several eggs called ephippium can last for decades

Question 10

Rotifers

Answer 10

• Mostly freshwater
• 0.1-0.5mm
• Cillia create a current that brings food to mouth
• Colony in some species

Question 11

Rotifer reproduction

Answer 11

• Can reproduce sexually or asexually
• Males usually lack a functional digestive system 0 live long enough to mate

Question 12

Copepods

Answer 12

• Freshwater and marine
• 1-2mm
• Most species are omnivores
• Very swift

Question 13

Copepod Reproduction

Answer 13

• REproduce sexually
• Juvinilees are called “naupli”
• Some eggs are desciattion resistant