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BIO120H1 Lecture : Bio lab 12 Feb 2 2010

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24 Aug 2010

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Ingrid L.Stefanovic

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BIO120H1 Full Course Notes

BIO120H1 Full Course Notes

Document Summary

Early atomphere is rich in hydrogen, sulphur and nitrogen, until the evolution of photosynthetic organisms that were capable to of: dzl2 zlzl2 . 2lk : releasing oxygen in the process. A protective layer ozone began to form to protecing the terrestrial life from the ultraviolet rays of the sun. Photosynthesis, through the release of oxygen into the atmosphere, created a more hospitable environment. Major groups: bryophytes j lack trie vascular tissues. Tracheophyte j have treu roots, stems and leaves as well as vasular tissues. Both groups lifecycle consists of an alternation between a diploid sporophyte generation and a haploid gametophyte generation. Design of plant body compromise of 2 parts j requirement of photosynthesis (max surface area to absorb light energy and carbon dioxide) and the requirement of reducing the evaporation of water (min surface area) Part of the descendant species adapt to new habitate, result in two different species j divergent evolution.

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Related Questions

1. The MAJORITY of all modern plant species ________.

a. have a Dominant Gametophyte Generation.

b. Have no Gametophyte
c. have Flagellated sperm

d. have a dominant Sporophyte Generation

e. have no Sporophyte.

2. Through the compression of _______ over millions of years. Coal formed in terrestrial habitats.

a. Peat Moss (a Bryophyte)

b. Angiosperm

c. Gymnosperm

d, Ferns

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Which of the following is true?

Question 18 options:

	Bryophyte roots are haploid but fern rhizoids are diploid.
	Both bryophyte roots and fern roots are haploid.
	Bryophyte rhizoids but not fern roots can take up nutrients.
	Bryophyte rhizoids are associated with the gametophyte generation whereas fern roots are associated with the sporophyte generation.
	Both bryophyte roots and fern roots contain vascular tissue.

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

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.

syngamy.

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

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.

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