2. Lesson 4 – Building your Pond

5. A. Duckweed info Scientific Name: Lemna minor Small Light green
Free-floating
Seed bearing
Found in ponds near or in wooded areas (freshwater)
Spread mainly by ducks and geese, sometimes humans

9. B. Nutrients Live in nutrient-rich ponds
Leaf litter for nutrients
Areas with septic drainage or feed lots
Nitrogen and Phosphorus are main nutrients

10. C. Duckweed Leaves Known as “FRONDS” Average 1-3 leaves per Lemna
Length: 1/16 – 1/8 of inch
Single root from each frond

13. D. Duckweed Overpopulation
Thick growths
Completely cover ponds
Prevents sunlight reaching water which depletes oxygen
Algae and underwater plants cannot photosynthesize
Fish population decreases and dies off

16. E. Interesting Facts Eaten by Waterfowls (geese, swans, ducks)
Eaten by humans in Thailand
Shelter for bullfrogs
Helps purify water
Decreases water evaporation – keeps water cool

18. Page 46 – warm-up question
Fish
Ducks
Algae
Bacteria
Frogs
Dragonflies
Lilypads
moss