Challenger Logo

Challenger App

Get it on Google PlayGet it on App Store
Challenger App

No.1 PSC Learning App

★
★
★
★
★
1M+ Downloads
Get App

Which statements correctly characterize Plankton?

  1. Plankton possess strong swimming abilities to counteract water currents.
  2. This group includes both microscopic plants (phytoplankton) and animals (zooplankton).
  3. Their distribution is primarily determined by the water currents due to limited locomotive power.
  4. Plankton are only found in calm freshwater ecosystems.

    A1, 4

    B2, 3

    C3 only

    D3, 4

    Answer:

    B. 2, 3

    Read Explanation:

    PLANKTON

    • This group includes both microscopic plants (phytoplankton) and animals (zooplankton) found in all aquatic ecosystems, except certain swift moving waters.

    • The locomotory power of the planktons is limited so that their distribution is controlled largely, by currents in the aquatic ecosystems.

    • Planktons are divisible into Plants (chiefly algae) known as Phytoplankton

    • Animals (primarily crustaceans and protozoans) known as Zooplankton.

    Related Questions:

    Which of the following is an example of a lentic ecosystem?

    Which regions are known for pastoral nomadism?

    1. Pastoral nomadism is common in the deserts of North Africa and West Asia.
    2. It is also prevalent in the dense rainforests of South America.
    3. The practice is widespread in the tundras of Siberia.

      Which of the following statements correctly identifies ways nutrients are lost from ecosystems?

      1. Nutrients can be lost from ecosystems through leaching.
      2. Wind and water erosion contribute to nutrient loss.
      3. Trace gas emission is not a known mechanism for nutrient loss.
      4. Harvesting materials from an ecosystem leads to nutrient removal.

        Which of the following accurately describes how strata are formed in an ecosystem?

        1. Strata are formed primarily by the decomposition of organic matter on the forest floor.
        2. Plants or trees within an ecosystem organize into several height classes, forming distinct layers.
        3. Plants belonging to the same height class are considered to be part of the same stratum.
        4. The presence of animal populations at different altitudes determines ecosystem stratification.

          Which of the following statements accurately describes how nutrients enter ecosystems?

          1. Chemical weathering of rocks contributes to nutrients entry
          2. Biological fixation of atmospheric oxygen is a primary way nutrients enter ecosystems.
          3. Deposition of nutrients from the atmosphere through rain or wind-blown particles facilitates nutrient entry.
          4. Fertilization is a significant nutrient input, especially in unmanaged ecosystems.