Homework Help Forum: Repost- Biology

Posted by Anonymous on Sunday, September 13, 2009 at 9:27pm.

Will someone please help me out.. I have been posted these questions for 7 hours .. but no one has helped me out..please help me out..I got to figure it out within today..please.. 1. Which of the following is a biotic factor that might affect the life of a water-dwelling organism? A. Temperature of the water B. Speed of water current C. Pollutions in water D. Bacterial population in water My guess: D? 2. Which of the following things does NOT allow plants to obtain atmospheric nitrogen in a more usable form? A. Photosynthesis B. Lightning C. Symbiotic bacteria D. Chemical fertilizers My guess: A? 3. How does the amount of water on Earth change as a result of the water cycle? A. It always increases B. It alternately increases and decreases C. It remains constant D. It always decreases My guess: C? 4. Are the third-order heterotrophs consumed by gungal decomposers? My guess:Yes? 5. Which of the following fixes atmospheric N2 (nitrogen gas)? A. photosynthesis B. symbiotic bacterianon the roots of legumes C. uv light D. decay organisms E. autotrophs My guess: B? 6. Which ecological pyramid best explains why food chains are typically only three or four links long? A. Pyramid of biomass B. Pyramid of energy C. Pyramid of numbers D. None of the above My guess: B? Because only around 10% of the energy will released to the next level? Any help will be appreciated!

• Repost- Biology - bobpursley, Sunday, September 13, 2009 at 9:30pm

  I dont know number 4. The rest are correct.

  
  

• Repost- Biology - Anonymous, Sunday, September 13, 2009 at 9:49pm

  Oops.. typo for #4.. It should be.. Are the third-order heterotrophs consumed by fungal decomposers? My guess:Yes? Anyway, thanks,bobpursley!

  
  

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