The Biosphere Is

question 6

Multiple Choice

The biosphere is

• A)the thin layer surrounding the Earth that supports all life.
• B)all the populations of different species living and interacting within an ecosystem.
• C)a broad-scale region dominated by similar types of ecosystems.
• D)an area of land or water composed of a patchwork of communities and ecosystems.

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Definitions:

Cork

Outer covering of the bark of trees; made of dead cells that may be sloughed off.

Sieve-Tube Members

Specialized elongated cells in the phloem of vascular plants, which transport sugars and other organic nutrients.

Vascular Cambium

A layer of actively dividing cells in plants that produces secondary xylem (wood) and phloem, contributing to the thickness of stems and roots.

Mycorrhizae

Symbiotic associations between fungi and plant roots, enhancing nutrient and water absorption for the plant while the fungus benefits from access to carbohydrates.