🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →

HomeClass Notes1,200,000CA670,000

BI111 Lecture Notes - Lecture 4: Vascular Tissue, Lepidodendron, Bryophyte

30 views5 pages

13 Feb 2018

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Early plants had no control over water content, were restricted to moist areas. Like algae, water essential for reproduction (motile gametes) Present in all bryophytes (mosses, liverworts and hornworts) Present in mosses and hornworts (not in liverworts) Competition between individuals for access to light, leads to selection for access to light, leads to selection for growth and for structures that increase photosynthetic ability. Cellulose fibres anchors with lignin: stronger and more rigid. The gametophytes of bryophytes, ferns and some gymnosperms produce motile (haploid) sperms cells (like their algal ancestors) Impossible for sperm to reach eggs in absence of water. No vascular tissues for movement of waste and nutrients- in wet habitats. Root and shoot system are an integrated system with many adaptations for transport of water, minerals and organic substances, as well as structural support. Long distances between roots and shoot parts (xylem and phloem) Phloem: vascular tissue which conducts sugar through the plant body (down)

Related Documents

BI111 Lecture Notes - Lecture 9: Ordovician, Charales, Marchantiophyta

cerisemallard21

BI111 Lecture Notes - Lecture 16: Charophyta, Marchantiophyta, Amylose

grayhedgehog333

BI111 Lecture Notes - Lecture 15: Red Algae, Charophyta, Ordovician

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

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.

violetantelope136