A fish die-off occurs in a pond near an agricultural field where fertilizer high in N and P has been sprayed. Describe and explain the ecological principle behind why the fertilizer high in N and P would trigger this event in the pond.

In the nitrogen cycle the Assimilation process is a metabolic reaction: anabolic, catabolic, endergonic, exergonic, heterotrophic or autotrophic.

High lignin content in leaf litter is associated with lower palatability among most decomposers. True False

What can be concluded from the graph and the description of the experiment? A) fertilizer b is more expensive than fertilizer a B) fertilizer a has a slower growth rate effect on the plants compared to fertilizer b C) plants using fertilizer a were located further away from windows where sunlight was present D) during a four week period, the plants with fertilizer b received more water than the plants with fertilizer a

Discuss how changes in the phosphorus cycle have caused eutrophication of waterways.

Explain any one method of preparation of bio-fertilizers.

23. Ecological stability is the result of _______________, the tendency of a system not to change when disturbed,     and _________________, the ability of the system to recover.     24.  Which of the following is NOT a limiting factor in primary production?   Question 24 options:   A)  Red light   B)  Oxygen   C)  Micronutrients   D)  Water

Pesticides vary in terms of their persistence in soils. Give three possible reasons for the existence of such variation.

Immediately after deforestation, which of the following processes might you expect to increase with respect to nitrogen cycling? (Select all correct) Mineralization of org-N Immobilization of inorg-N Leaching Denitrification I would expect no change

What is the difference between an open and closed system in reference to nutrient acquisition? Why is it necessary for an organism to be an open system?