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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

The major source of nutrients in the headwaters of a small stream is form:

a. dead leaves and other organic matter from adjacent land.

b. photosynthesis by phytoplankton.

c. photosynthesis by floating aquatic plants.

d. the activity of chemoautotrophic bacteria.

e. minerals from the underlying bedrock.

Summary Introduction

Introduction:

The rivers or streams are rich in nutrients, which helps in the growth of aquatic plants. The rivers become rich in nutrients as they flow from a land eroding a part of it. At the river mouth, which is the place where they are received by the sea or the ocean, the nutrient level is maximum.

Explanation

Justification/Explanation for the correct answer:

Option (a) is given that the major source of the nutrients in water streams comes from the organic matter and the dead leaves from the adjoining land. The land contains organic matter in the form of dead plants, leaves, animals, and soil that comes in contact with the passing river stream. All these substances are degraded within the water body, which increases its nutrient content. Hence, option (a) is correct.

Explanation for the incorrect answers:

Option (b) is given that the major source of the nutrients in headwater streams comes from photosynthesis by the phytoplankton. Phytoplankton are found abundantly in still water bodies, like seas and oceans. Thus, they do not contribute to the nutrients in headwaters of small river streams. So, it is an incorrect option...

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