Lec22_Take_home_ans - Take-Home Assignment for Lecture#23...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Take-Home Assignment for Lecture #23 – ANSWER KEY Phosphorus Cycle: (figure 59.16) The main reserve of phosphorus exists in: mineral form in rock and sediment (1pt) How is phosphorus cycled back into the soil? weathering of rock & minerals leeches material into the soil – runoff from the soil into the water. (1pt) How do plants acquire their phosphorus? taken up from the soil (½ pt) How do herbivores and carnivores obtain their phosphorus? eating plants or animals who have eaten plants (½ pt) Explain the relationship between primary production and total phosphorus concentration. As the concentration of phosphorus increase there is an increase in the primary production (the growth of the photosynthetic organisms). (1pt) Is an increase in primary production always beneficial. Explain. No. An increase in primary production (e.g., algae bloom) in an aquatic system can lead to a depletion of oxygen in the water due to the decomposition of the dead algae by bacteria. The reduction in oxygen can result in ‘fish kills’ due to the depletion of the dissolved oxygen in the water. (1pt) Carbon Cycle: (figure 59.18) The main reserve of carbon exists in: atmosphere – in the form of CO 2 (1pt) rocks & fossil fuels was given full credit too (I was looking for accessible carbon, but I didn’t not clarify this, so both answers were given credit. How is carbon cycled between the atmosphere and organisms?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/18/2012 for the course BIOL L111 taught by Professor Dr.susanhengeveld during the Fall '11 term at Indiana.

Page1 / 2

Lec22_Take_home_ans - Take-Home Assignment for Lecture#23...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online