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6. What constraints does the terrestrial environment impose on plants? (10 pts)

7. What adaptations do plants have that allow them to survive desiccation due to cold or heat? (10 pts)


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Jamar Ferry
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28 Sep 2019

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Related questions

1. Select the true statements concerning tracheids.

Tracheids are responsible foranchoring the plant to a substrate.
Pterophytes lack tracheids but haveeuphylls.
Without tracheids colonization ofland would not have been possible.
All of the large dominant extantland plants are tracheophytes.
Tracheids allow for efficienttransport of water over longer distances.

2. Plants lacking well-developed conducting systems such asmosses, liverworts, and hornworts have been called

sporophytes.
bryophytes.
gymnosperms.
gametophytes.

angiosperms.

3.Select the true statements concerning gametophytes andsporophytes.

Both produce gametes.
Sporophytes are alwaysnutritionally dependent on the gametophytes.
Across all plant speciesgametophytes tend to remain small.
Only sporophytes produce eggs.

Antheridia are located on the gametophyte.

4. A waxy cuticle helps prevents desiccation. What is the costof this adaptation?

Slower H2Otransport
Reduced gas permeability
Lowered light absorption
Increased exposure to damaging UVradiation

Increased susceptibility to pathogenic infection

5.Select the best answer to complete the following statement.Stomata are openings used by plants for the passage of

carbon dioxide, oxygen, and watervapor.
only carbon dioxide and spores orgametes.
only carbon dioxide and watervapor.
only carbon dioxide andpollen.

only oxygen and carbon dioxide.

6.One of the main distinctions between charophytes and landplants is the possession of a cuticle. Why do modern charophyteslack a cuticle?

Their tough seed coats negate theneed for a cuticle.
Cuticles aren't necessary whenliving in water.
Modern Charophytes make up for theabsence of a cuticle by have large numbers of stomata.

Charophytes have a haplodiplontic life cycle.

7.Select the following plant adaptations for the terrestrialenvironment that are correctly listed by their function.

Stomata allow for gas exchangebetween the plant and the atmosphere.
Tracheids protect againstdesiccation.
Stomata transport water aroundplant body.

Tracheids transport water and minerals around the plantbody.

8.What would be the simplest way for a non-botanist to confirmthat the fern is not a small palm?

Height, all ferns are verysmall
Lack of roots, palms have roots butferns do not
Leaf shape, only ferns havedissected leaves

Dots on the underside of the leaf, only ferns have sporangiaunder their fronds

9.Select the true statements relating to the colonization ofland by plants.

Desiccation is a much more commonproblem in terrestrial environments.
Cuticle layers reduce gasexchange.
Xylem tissue, seeds and stomata arefound on both plants and charophytes.

Without trachids land plant would not have been to able to growmore than just a meter or so tall.

10.Survival on land for organisms is difficult because of theproblem of

spore germination.
coevolution.
desiccation.
pollination.

syngamy.

11. Well-developed vascular systems are absent in all of thefollowing except

mosses.
Charophytes.
hornworts.
liverworts.

Pterophytes.

12. Bryophytes, like ferns and certain other tracheophyteplants, require

soil to reproduce sexually.
water to reproduce sexually.
sunlight to reproducesexually.
air to reproduce sexually.

shade to reproduce sexually.

13.Plant success on the terrestrial landscape is linked to theevolution of all of the following except

gas-filled air spaces.
stems.
specialized reproductivefeatures.
specialized roots.
increased area for photosynthesisin the leaves.

Ecology

1- Which terrestrial biome has low species diversity? Why do species in this environment exhibit fascinating adaptations?

2- Which biome (or biomes) have species that are adapted to fire?

3- What are the pelagic and benthic zones?

You will create this assignment following the Assignment Detail instructions below. This assignment will be submitted in the Unit 5 - Submission Assignment lesson in intellipath.

Review the tutorial titled How to Submit the Intellipath Submission Assignment.

Please submit your work to this week’s Intellipath Unit Submission lesson. Click the Upload button within the submission lesson to access the submission area. Click the Select File button to upload your document, and then click "OK" to finish.

Plant Chemical Adaptations

Physical adaptations are one way plants have become well-adapted to specific environmental conditions. For example, cacti have spines in place of leaves to prevent water loss in the arid conditions of the desert, and deciduous trees lose their leaves in the fall to survive cold weather conditions over the winter. Chemical adaptations are another means for plant protection. Many plants produce toxic or noxious compounds to protect themselves from insects or animals that would eat them, to reduce competition from other plants, or even to change the response of pollinators. Humans analyze and harvest these compounds for our own benefit.

Read this article on the search for useful plant compounds: Mother Nature’s Medicine Cabinet

Read this article on the less-than-beneficial uses of plant products: Addictive Drugs That Are Actually Pesticides

Choose ONE of the following compounds:

Caffeine

Cocaine

Nicotine

Artemisinin

Answer these four questions:

Describe the compound and in what plant(s) it is found.

Explain how this compound provides protection for the plant.

Does the compound provide any other benefits for the plant, such as enhanced pollination?

What effect does the compound have on humans?

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