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Carbon monoxide (CO) is dangerous because:

AIt causes acid rain

BIt binds with hemoglobin, reducing oxygen transport

CIt reacts with ozone

DIt forms smog

Answer:

B. It binds with hemoglobin, reducing oxygen transport

Read Explanation:

  • CO forms carboxyhemoglobin with blood hemoglobin, reducing oxygen transport, leading to suffocation and heart diseases.


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How does turbidity affect aquatic ecosystems?

  1. It increases the penetration of sunlight, enhancing photosynthesis.
  2. It reduces the extent of light penetration, thereby limiting photosynthetic activity.
  3. It has no significant impact on light penetration or photosynthesis.
  4. It is caused by dissolved gases and does not involve suspended particles.
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    Choose the correct statements concerning autotrophs in an ecosystem.

    1. Autotrophs are also known as consumers because they feed on other organisms.
    2. Photosynthetic plants, possessing chlorophyll, synthesize high-energy organic compounds using sunlight.
    3. Certain autotrophs, like some bacteria, can synthesize food from chemical substances instead of sunlight.
    4. Autotrophs form the basis of all ecosystems.