Home
Class 12
BIOLOGY
Phytoplanktons are :...

Phytoplanktons are :

A

Heterotrophs

B

Autotrophs

C

Saprotrophs

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ECOLOGY AND ENVIRONMENT

    MBD PUBLICATION|Exercise QUESTION BANK|197 Videos

  • EVOLUTION

    MBD PUBLICATION|Exercise QUESTION BANK|165 Videos

Similar Questions

Explore conceptually related problems

Assertion: In a marine aquatic ecosystem, the biomass of phytoplanktons (producers) at any given time, is lower than the biomass of zooplanktons (primary consumers). Reason: Phytoplanktons are consumed almost as rapidly as they are formed and thus have shorter life spans.

Phytoplanktons of a pond ecosystem act as :

Assertion: Aquatic herbivores are usually more productive as compared to terrestrial herbivores. Reason: Phytoplanktons achieve faster grwoth rate and more nutritious to heterotrophs than their terrestrial counterparts due to their small size and lack of structural tissues.

Given figure represents a pyramid of biomass in an aquatic ecosystem. Identify A and B and select the correct answer. (i) A is the crop which supporsts and B is the crop which is supported. (ii) A is the crop which is supported and B is the crop which supports. (iii) A is phytoplanktons and B is zooplanktons. (iv) A is zooplanktons and B is phytoplanktons.

The given pyramid shows the relative bionmass of zooplanktons and phytoplanktons in a marine ecosystem The biomass of the zooplanktons is higher than the of the phytoplanktons because

Decomposers are generally ........ (green plants, microorganisms, phytoplanktons, insects)

ul("Phytoplanktons") occupy more than one trophic level in pond ecosystem.

Fill in the missing stages in the given primary hydrarch succession. Phytoplankton to A to B to C to Sedge meadow stage to D to Forest plant stage

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this : 1. Lots of urea and phosphate fertilize were used in the crops in the vicinity 2 The area was spreyed with DDT by an aircraft 3. The lake was turned green and stinky 4. Phytoplankton populations in the lake declined initially therby greatly reducing photosybthesis.

Study the following ecological pyramids carefully. Mathc the following statements I,ii and iii with gien pyramidsa, B and C and select the correct answer. (i) Inverted pyramid of biomass depicting small standing crop of phytoplanktons supporintg a large standing crop of zooplanktons (ii) Pyramid of numbers in a grassland ecosytems showing about 6 milion producers. (iii) Upright pyramid of biomass

MBD PUBLICATION-ECOSYSTEMS-QUESTION BANK
  1. Pyramid of energy in aquatic ecosystem is :

    Text Solution

    |

  2. Extinction of a species in a food chain is compensated by :

    Text Solution

    |

  3. Phytoplanktons are :

    Text Solution

    |

  4. Large unit of land having different types of plants and animals is kno...

    Text Solution

    |

  5. Estnaries are considered as nutrient trap due to the mixing of :

    Text Solution

    |

  6. Phytoplanktons are dominant in which of the following zone?

    Text Solution

    |

  7. Detritus food chain starts from :

    Text Solution

    |

  8. The dominant producers in the neritic zone of the sea are :

    Text Solution

    |

  9. In which of the following biome maximum number of plants and animals a...

    Text Solution

    |

  10. About 70% of total global carbon is found in :

    Text Solution

    |

  11. Quercus species are the dominant component in :

    Text Solution

    |

  12. Which of the following ecosystem has very little primary productivity ...

    Text Solution

    |

  13. Which type of pyramind of energy is inverted ?

    Text Solution

    |

  14. An organism contains carbon molecules which have passed through three ...

    Text Solution

    |

  15. Which one of the following is considered as pioneer community in xerar...

    Text Solution

    |

  16. Which one of the following type of organisms occupy more than one trop...

    Text Solution

    |

  17. Energy and nutrients enter a community by :

    Text Solution

    |

  18. Which are the first organisms to colonize on abare rock ?

    Text Solution

    |

  19. The loss of energy as one proceeds from one trophic level to the next ...

    Text Solution

    |

  20. In primary succession on rocks ,the pioneer species are usually

    Text Solution

    |