1. Which of the following adaptations is commonly found in aquatic plants?
a) Thick waxy cuticle
b) Stomata on the upper surface of leaves
c) Extensive root system
d) Stomata submerged under water
Answer: d) Stomata submerged under water
2. Which aquatic plant is commonly known for its long, slender leaves and underwater flowers?
a) Water lily (Nymphaea)
b) Hydrilla (Hydrilla verticillata)
c) Vallisneria (Vallisneria spiralis)
d) Duckweed (Lemna minor)
Answer: c) Vallisneria (Vallisneria spiralis)
3. What type of root system is typically found in aquatic plants?
a) Taproot system
b) Fibrous root system
c) Adventitious root system
d) Contractile root system
Answer: c) Adventitious root system
4. Which of the following aquatic plants floats on the surface of water and has small, rounded leaves?
a) Water hyacinth (Eichhornia crassipes)
b) Hornwort (Ceratophyllum demersum)
c) Water lettuce (Pistia stratiotes)
d) Azolla (Azolla caroliniana)
Answer: a) Water hyacinth (Eichhornia crassipes)
5. What is the primary function of air spaces in aquatic plants?
a) To provide structural support
b) To facilitate gas exchange
c) To store water
d) To absorb nutrients
Answer: b) To facilitate gas exchange
6. Which aquatic plant is commonly used in aquariums and has feathery, delicate leaves?
a) Java moss (Taxiphyllum barbieri)
b) Amazon sword (Echinodorus grisebachii)
c) Anubias (Anubias barteri)
d) Cabomba (Cabomba caroliniana)
Answer: a) Java moss (Taxiphyllum barbieri)
7. What is the function of stomata in aquatic plants?
a) To regulate water loss
b) To facilitate gas exchange
c) To absorb nutrients
d) To anchor the plant to the substrate
Answer: b) To facilitate gas exchange
8. Which of the following aquatic plants is known for its submerged, ribbon-like leaves and small white flowers?
a) Water lily (Nymphaea)
b) Watermilfoil (Myriophyllum)
c) Water lettuce (Pistia stratiotes)
d) Water hyacinth (Eichhornia crassipes)
Answer: b) Watermilfoil (Myriophyllum)
9. Which aquatic plant is often used in wastewater treatment for its ability to absorb excess nutrients?
a) Water lettuce (Pistia stratiotes)
b) Water hyacinth (Eichhornia crassipes)
c) Duckweed (Lemna minor)
d) Water milfoil (Myriophyllum)
Answer: c) Duckweed (Lemna minor)
10. What type of habitat do submerged aquatic plants prefer?
a) Shallow, stagnant water
b) Flowing streams and rivers
c) Deep, open water bodies
d) Wetlands and marshes
Answer: c) Deep, open water bodies
11. Which aquatic plant is known for its rapid growth and invasive nature, causing ecological problems in water bodies?
a) Hornwort (Ceratophyllum demersum)
b) Water hyacinth (Eichhornia crassipes)
c) Vallisneria (Vallisneria spiralis)
d) Water lily (Nymphaea)
Answer: b) Water hyacinth (Eichhornia crassipes)
12. What is the primary function of the floating leaves in aquatic plants like water lilies?
a) Gas exchange
b) Absorption of nutrients
c) Anchorage to the substrate
d) Protection against herbivores
Answer: a) Gas exchange
13. Which aquatic plant is commonly used as a food source for fish and other aquatic organisms?
a) Water lettuce (Pistia stratiotes)
b) Duckweed (Lemna minor)
c) Water milfoil (Myriophyllum)
d) Hornwort (Ceratophyllum demersum)
Answer: b) Duckweed (Lemna minor)
14. Which adaptation allows some aquatic plants to survive in oxygen-deprived environments?
a) Formation of adventitious roots
b) Development of specialized leaves
c) Formation of air spaces in tissues
d) Rapid reproduction
Answer: c) Formation of air spaces in tissues
15. Which aquatic plant is commonly found floating on the surface of water bodies and reproduces rapidly?
a) Cabomba (Cabomba caroliniana)
b) Azolla (Azolla caroliniana)
c) Duckweed (Lemna minor)
d) Water milfoil (Myriophyllum)
Answer: c) Duckweed (Lemna minor)
16. What type of reproductive structures are commonly found in aquatic plants for dispersal?
a) Flowers
b) Seeds
c) Spores
d) Rhizomes
Answer: c) Spores
17. Which aquatic plant is known for its ability to fix atmospheric nitrogen in symbiosis with cyanobacteria?
a) Vallisneria (Vallisneria spiralis)
b) Azolla (Azolla caroliniana)
c) Hornwort (Ceratophyllum demersum)
d) Water lily (Nymphaea)
Answer: b) Azolla (Azolla caroliniana)
18. What is the primary function of the roots in aquatic plants?
a) Absorption of water and minerals
b) Anchorage to the substrate
c) Facilitation of gas exchange
d) Protection against herbivores
Answer: b) Anchorage to the substrate
19. Which aquatic plant is commonly used for landscaping in ponds and water gardens due to its attractive flowers?
a) Hornwort (Ceratophyllum demersum)
b) Water lily (Nymphaea)
c) Cabomba (Cabomba caroliniana)
d) Vallisneria (Vallisneria spiralis)
Answer: b) Water lily (Nymphaea)
20. What adaptation allows some aquatic plants to survive in habitats with fluctuating water levels?
a) Formation of aerial roots
b) Development of specialized stems
c) Formation of water storage tissues
d) Rapid reproduction
Answer: a) Formation of aerial roots
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