Home
Class 12
BIOLOGY
Consider the following statements. a. NP...

Consider the following statements. a. NPP is the available blomass for the consumption to herbivores and decomposers. b. Plants capture only 2 - 10 percent of PAR. c. Energy at lower trophic level is always less than at a higher level. d. Earth is an open ecosystem w.r.t. energy. The correct statements are

A

Only a & b

B

a, b & d

C

a, c & d

D

b, c & d

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • TEST 9

    AAKASH INSTITUTE|Exercise EXAMPLE|169 Videos

  • THE LIVING WORLD

    AAKASH INSTITUTE|Exercise TRY YOURSELF|44 Videos

Similar Questions

Explore conceptually related problems

Consider the following statements and choose the correct option :- (i) Sun is the only source of energy for all ecosystem on earth (ii) PAR is less than 50 percent in incident solar radiation

Consider the following statements In an ecosystem energy (i) Movement is unidirectional (ii) Is lost irretrievably (iii) Movement is non-cyclic (iv) Movement is from higher to lower trophic levels Of these statements

Read the following statements carefully : ( i ) primary succession is a very slow process taking thousands of years for the climax to be reached. (ii) The energy at a higher trophic level is always more than at a lower level (iii) Bacterial and fungal enzymes degrade detritus into simple inorganic substances. This process is called fragmentation . (iv ) All succession, whether taking place in water or on land, proceeds to a similar climax community : the mesic condition . Which of the two above statements are correct ?

Consider the following for statements (1 - 4 ), select the correct option starting which ones are true (T) and which ones are false (F) (1) An orgenism at each trophic level depends on those at a higher energy demands. (2) Each trophic level has a certain mass of living material at a particular time called standing state . (3) Each trophic level has a certain mass of non-living material at a particular time called standing state . (4) The number of trophic levels in a grazing food chain is not restricted.

State whether the following statement is true or false : Only 10 per cent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.

The length of a rectangle is reduced by 20% and breadth is kept constant, and the new figure that is formed is a square. Consider the following statements: The area of square is 25% less than the area of rectangle. The perimeter of square is approximately 11% less than the perimeter of rectangle. The diagonal of square is approximately 12% less than the diagonal of rectangle. Which of the statements given above is/are correct? (a) 1 only (b) 1 and 2 (c) 2 and 3 (d) 1, 2 and 3

A plane progressive transverse wave is passing through medium along the positive x-axis at the given instant of time The nature of the displacement - position ( y vs x ) graph of particles of medium at that instant is as shown in figure.Which of the following statements are correct.(A B C are three particles of the vibrating string) A) Elastic potential energy per unit length of the string at the point B is more than that at points A and C B) Elastic potential energy per unit length of the string at the point C is more than that at points A and B C) Velocity of the particle at A is along negative y -axis. D) Velocity of the particle at C is along positive y- axis. 1) Only B C D are correct 2) Only A C D are correct 3) Only A C are correct 4) Only A D are correct

Consider the following statements. A. The movement of energy is unidirectional from the higher trophic level towards the lower trophic level. B. Detritivores break down detritus into smaller particles bya a process is called fragmentation. C. Humification and mineralisation occur during decomposition in the soil. D. Decomposition is largely an oxygen-releasing process. Of the above statements:

AAKASH INSTITUTE-Test-12-Exercise
  1. In mung bean , resistance to yellow mosaic virus and powdery mildew we...

    Text Solution

    |

  2. Select the mismatched pair

    Text Solution

    |

  3. Consider the following statements. a. NPP is the available blomass for...

    Text Solution

    |

  4. Diversity shown by a single species at the genetic level over its dist...

    Text Solution

    |

  5. Odd climatic changes that result in rise in temperature of ocean water...

    Text Solution

    |

  6. Similarities between annelids and arthropods, include all, except

    Text Solution

    |

  7. A stable population exists in Hardy Woinborg equilibrium with two alle...

    Text Solution

    |

  8. Haemoglobin in capillaries of the lungs is exposed to an oxygen pressu...

    Text Solution

    |

  9. A person takes a large overdose of antacid. As a result, the activity ...

    Text Solution

    |

  10. Which of the following association of brain structure and function is ...

    Text Solution

    |

  11. To ensure survival of their species, animals which do not spend a larg...

    Text Solution

    |

  12. Which of the following is in a different chemical category than the ot...

    Text Solution

    |

  13. Find the incorrect match.

    Text Solution

    |

  14. A mechanism that mammals have developed to dissipate excess heat in ho...

    Text Solution

    |

  15. Which of the following represents earliest set of haploid structures t...

    Text Solution

    |

  16. Decline in which hormone leads to regression of corpus luteum in non-p...

    Text Solution

    |

  17. Choose the Incorrect statement regarding Syphilis.

    Text Solution

    |

  18. British doctors Patrick Steptoe and Robert Edwards have been credited ...

    Text Solution

    |

  19. Properties exhibited by normal cells include

    Text Solution

    |

  20. Symptoms of allergy can be alleviated by administration of all, except

    Text Solution

    |