Coral reefs, mangroves, and seagrass beds MCQs

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 12, 2024

  1. Coral reefs are primarily built by:
    • A) Coral polyps
    • B) Algae
    • C) Sea anemones
    • D) Mollusks
      Answer: A) Coral polyps

  1. Which of the following is a major threat to coral reefs?
    • A) Coral bleaching
    • B) Seaweed growth
    • C) Ocean currents
    • D) Coastal erosion
      Answer: A) Coral bleaching

  1. Mangroves are uniquely adapted to:
    • A) Tidal fluctuations and saline conditions
    • B) Deep-sea environments
    • C) Cold temperatures
    • D) High-altitude habitats
      Answer: A) Tidal fluctuations and saline conditions

  1. Seagrass beds provide which of the following ecosystem services?
    • A) Habitat for marine life and water filtration
    • B) Soil formation
    • C) Climate regulation
    • D) Coastal erosion control
      Answer: A) Habitat for marine life and water filtration

  1. The primary producers in seagrass beds are:
    • A) Seagrasses
    • B) Algae
    • C) Phytoplankton
    • D) Coral polyps
      Answer: A) Seagrasses

  1. Coral reefs are often found in which type of water?
    • A) Warm, shallow, tropical waters
    • B) Cold, deep waters
    • C) Brackish waters
    • D) High-salinity waters
      Answer: A) Warm, shallow, tropical waters

  1. Which of the following is a key function of mangrove forests?
    • A) Coastal protection and sediment trapping
    • B) Deep-sea exploration
    • C) Marine navigation
    • D) Coral reef formation
      Answer: A) Coastal protection and sediment trapping

  1. What is a major impact of coastal development on mangroves?
    • A) Habitat loss and degradation
    • B) Increased nutrient levels
    • C) Changes in ocean currents
    • D) Increased species diversity
      Answer: A) Habitat loss and degradation

  1. Which organism often forms mutualistic relationships with coral polyps?
    • A) Zooxanthellae
    • B) Sea stars
    • C) Jellyfish
    • D) Sea cucumbers
      Answer: A) Zooxanthellae

  1. Seagrass beds are important for which aspect of marine life?
    • A) Nursery grounds for fish
    • B) Whale migration
    • C) Deep-sea mining
    • D) Coastal tourism
      Answer: A) Nursery grounds for fish

  1. Coral reefs are known for their:
    • A) High biodiversity
    • B) Low biodiversity
    • C) High salinity
    • D) Cold temperatures
      Answer: A) High biodiversity

  1. Which of the following species is commonly found in mangrove forests?
    • A) Mangrove monitor
    • B) Polar bear
    • C) Emperor penguin
    • D) Snow leopard
      Answer: A) Mangrove monitor

  1. Seagrasses contribute to which of the following environmental processes?
    • A) Carbon sequestration
    • B) Soil erosion
    • C) Ice formation
    • D) Desertification
      Answer: A) Carbon sequestration

  1. Which of the following is NOT a characteristic of coral reefs?
    • A) High water temperature
    • B) Low light penetration
    • C) Complex three-dimensional structure
    • D) High nutrient availability
      Answer: B) Low light penetration

  1. Mangroves are critical for:
    • A) Protecting coastal areas from storm surges
    • B) Desertification control
    • C) Mountain ecosystem stability
    • D) Ice shelf maintenance
      Answer: A) Protecting coastal areas from storm surges

  1. Which factor is most likely to cause coral bleaching?
    • A) Elevated sea temperatures
    • B) Increased salinity
    • C) High nutrient levels
    • D) Strong ocean currents
      Answer: A) Elevated sea temperatures

  1. Which of the following is a primary threat to seagrass beds?
    • A) Water pollution and coastal development
    • B) High predation rates
    • C) Oceanic currents
    • D) Ice formation
      Answer: A) Water pollution and coastal development

  1. Coral reefs are most commonly located in:
    • A) Tropical and subtropical regions
    • B) Polar regions
    • C) Temperate regions
    • D) Deep-sea regions
      Answer: A) Tropical and subtropical regions

  1. Which of the following contributes to the decline of coral reefs?
    • A) Overfishing and pollution
    • B) Increased marine biodiversity
    • C) Coral reproduction
    • D) Reef restoration
      Answer: A) Overfishing and pollution

  1. Mangrove trees are adapted to deal with:
    • A) Saline water and fluctuating tides
    • B) High altitude and low temperatures
    • C) Desert conditions
    • D) High mineral content in soil
      Answer: A) Saline water and fluctuating tides

  1. Which marine plant is essential for stabilizing sediments in coastal areas?
    • A) Seagrass
    • B) Kelp
    • C) Phytoplankton
    • D) Algae
      Answer: A) Seagrass

  1. What type of habitat do coral reefs provide for many marine species?
    • A) Complex, structured habitat
    • B) Open ocean habitat
    • C) Abyssal plain habitat
    • D) Estuarine habitat
      Answer: A) Complex, structured habitat

  1. Which of the following is a key ecological role of mangroves?
    • A) Acting as a buffer against coastal erosion
    • B) Supporting deep-sea ecosystems
    • C) Providing oxygen to marine environments
    • D) Facilitating offshore oil drilling
      Answer: A) Acting as a buffer against coastal erosion

  1. Which of the following is a common adaptation of seagrasses to underwater life?
    • A) Ability to absorb nutrients from the water
    • B) Ability to survive in arid environments
    • C) Ability to store water in thick stems
    • D) Ability to grow in cold temperatures
      Answer: A) Ability to absorb nutrients from the water

  1. Which of the following practices can help protect coral reefs?
    • A) Reducing pollution and sustainable fishing practices
    • B) Increasing coastal development
    • C) Ignoring marine protected areas
    • D) Expanding industrial activities
      Answer: A) Reducing pollution and sustainable fishing practices

  1. What is the primary source of food for coral polyps?
    • A) Symbiotic algae (zooxanthellae)
    • B) Plankton
    • C) Small fish
    • D) Detritus
      Answer: A) Symbiotic algae (zooxanthellae)

  1. Which of the following is a key characteristic of seagrass beds?
    • A) They are submerged in shallow, coastal waters
    • B) They grow in high-energy wave environments
    • C) They have high diversity of tree species
    • D) They are found in deep ocean trenches
      Answer: A) They are submerged in shallow, coastal waters

  1. Which type of mangrove tree has pneumatophores for breathing?
    • A) Black mangroves
    • B) Red mangroves
    • C) White mangroves
    • D) Buttonwood mangroves
      Answer: A) Black mangroves

  1. Coral reefs support approximately what percentage of all marine species?
    • A) 25%
    • B) 50%
    • C) 10%
    • D) 75%
      Answer: A) 25%

  1. Seagrasses are important for maintaining:
    • A) Water clarity and reducing coastal erosion
    • B) Ice stability in polar regions
    • C) Mountain ecosystems
    • D) Desert vegetation
      Answer: A) Water clarity and reducing coastal erosion

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