Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 21, Problem 8RQ
What is a pollen grain? What role has it played in helping plants colonize dry land?
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Chapter 21 Solutions
Biology: Life on Earth
Ch. 21 - 1. Scientists hypothesize that the ancestors of...Ch. 21 - Plant adaptations to life on land include a(n)...Ch. 21 - 3. Seedless vascular plants must reproduce when...Ch. 21 - 4. Three groups of nonvascular plants are _______,...Ch. 21 - 1. What is meant by “alternation of generations”?...Ch. 21 - 2. Explain the evolutionary changes in plant...Ch. 21 - Describe evolutionary trends in the life cycles of...Ch. 21 - Prob. 4RQCh. 21 - List the structural adaptations necessary for the...Ch. 21 - The number of species of flowering plants is...
Ch. 21 - List the adaptations of gymnosperms that have...Ch. 21 - What is a pollen grain? What role has it played in...Ch. 21 - The majority of all plants are seed plants. What...Ch. 21 - You are a geneticist working for a firm that...Ch. 21 - 1. Prior to the development of synthetic drugs,...Ch. 21 - 2. Only a few hundred of the more than 200,000...
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- In flowers, the structures that produce male gametophytes are called _______ ;the strcutures that produce female gametophytes are called _______ . a. pollen grains; flowers c. anthers; stigma b. stamen; carpels d. megaspores; microsporesarrow_forwardIs seed coat part of sporophyte generation or gametophyte generation?arrow_forwardA plant biologist discovers a new species of plant in the ashes of a recent forest fire along the sides of a steep mountain range. It is fall, and temperatures are dropping below freezing. The biologist cannot stay in the field to observe the plant. What can he infer about the plants reproductive strategy based on his recent observations? A) the plant will produce flowers because at this altitude there is sufficient sunlight B) the plant will produce comes because cones will mature into adult plants more rapidly C) the plant will produce cones because cones allow for seed dispersal through all seasons D) the plant will produce flowers because flowers can protect the seed from extreme conditionsarrow_forward
- What would happen to a certain type of flower if its natural pollinator were killed by an insecticide?arrow_forwardOf the four parts of alteration of generations cycle (embryo/sporophyte, spore, gametophyte, gamete), which one does pollen belong to?arrow_forwardWhy do seedless plants need moisture to reproduce?arrow_forward
- Which is common to the life cycles of both flowering and non-flowering plants? a) produce fruit b) stay dormant c) pollination d) producing conesarrow_forwardUnder what conditions is it selectively advantageous for a plant to produce offspring identical to itself?arrow_forwardWhat is the name of the grass family? About how many species does it contain? Name seven genera (and give the common names) of grasses that are used for food. What kind of pollination do grasses have—animal or wind?arrow_forward
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