Which Term Refers to a Horizontal Stem Modified to Penetrate

question 28

Multiple Choice

Which term refers to a horizontal stem modified to penetrate the substrate and anchor a plant?

• A) sporangium
• B) protonema
• C) shoot system
• D) rhizome

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Definitions:

Paleozoic Era

That part of geologic time extending from roughly 541 million to 252 million years ago; divided into six periods: Cambrian (appearance of many new animal groups, the Cambrian radiation or Cambrian explosion); Ordovician (diversification of sea life); Silurian (appearance of jawed fishes, terrestrial plants, and air-breathing animals); Devonian (appearance of sharks and bony fishes); Carboniferous (great.

Silurian Period

A geologic time period that occurred roughly 443.8 to 419.2 million years ago, characterized by significant biological diversity and the early development of terrestrial ecosystems.

Ediacaran Period

The last (most recent) period of the Proterozoic eon, from 635 million to 541 million years ago; named for early animal fossils found in the Ediacara Hills in South Australia.

Gymnosperms

A group of seed-producing plants that include conifers and cycads, characterized by having seeds that are not enclosed in an ovary (fruit).