Biology 2601A/B Lecture : Moving Water in Plants study guide that includes all the notes and relevant pictures from lecture as well as additional notes from the assigned readings

166 views8 pages

greenwallaby395

16 Oct 2011

School

Department

Course

Professor

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

Document Summary

Plants need a circulatory system in order to survive; however they don"t have a pump. Have therefore evolved mechanisms and structures for transport. Translocate water and other inorganic nutrients from the roots to the leaves. Translocate sugars, proteins, and signalling molecules from source tissues (ex. leaves) to sink tissues (ex. roots) Made up of tracheids and vessel elements: these are dead cells. Need to be supported by fibres and other lignified cells (in trees) because are not very strong. Have pits to allow transport of things between tracheids. Network of tubes, horizontally and vertically (most of the movement is vertical) Primary vessel type in angiosperms (and others) End-end stacking plus perforation plates = continuous tubes. Some lateral movement (but slow, compared to vertical) Primary vessel type in conifers (trees: have very permeable pit membranes. Allows lateral movement to provide long connected vessels. The pits allow for the lateral transfer and keep it very vertical.

Related Questions

Adhesion of water molecules to vessels or tracheid walls to fight gravity is more important when there is not a lot of transpiration; what does a greater surface area to volume ratio look like in terms of tube diameter. Relate this to vessels vs tracheids. In the circumboreal forest regions (North Canada, Russia) what types of trees do you mainly see, angiosperms or gymnosperms? (Gymnosperms typically have no vessels, only tracheids; whereas angiosperms have both vessels and tracheids]) Is the vascular tissue properly adapted?

Capillarity is the movement of a liquid in a tube due to the adhesion of liquid molecules to the sides of the tube and cohesive attraction of the liquid molecules to each other. The height that water may obtain capillary action alone is defined by this equation, h=14.87/r, where the radius (r) of the tube is in Î¼m and height (h) is in meters. So in small-diameter tubes such as xylem tracheids and vessels, water can move upwards by capillary action.

Part A:) Without doing any calculations, do you think capillary action is sufficient to move water to the tops of 100 m tall trees?

Part B:) Now get out your calculators. Given that tracheids are about 80 Î¼m and vessel elements about 200 Î¼m in diameter, how high (in meters) can water move in xylem by capillary action alone?

Question 1: A slide of a terminal plant bud shows what physical characteristics demonstrating growth?

Answers:

1. an actively dividing group of cells between primordial leaves with undifferentiated vascular tissue

2. a vascular system with vascular bundles

3. spongy mesophyll tissue

4. sieve tubes, vessel elements and tracheids

Question 2: As the earth warmed and dried around 150 MYA, plants requiring _______ for fertilization were no longer dominant, but were eclipsed by plants that were ______ bearing named ___________ (literally naked seeds). These plants used _____ for fertilization freeing themselves from dependence on water. As animals of the era became terrestrial with means of terrestrial reproduction strategies, plants did the same using two different structures along with internal fertilization, the _____ being internal and fertilized by a wind carried _________ grain.

Answers:

1. water, seed, charophytya, dinosaurs, zygote, pollen

2. water, seed, gymnosperms, wind, egg, pollen

3. spores, cone, tracheids, water, pollen, embryo

4. water, flower, angiosperms, animals, spore, egg

Question 3: In the pith region of a stem the vascular system consists of two major structures;

Answers:	1. Phloem with trachieds and vessel elements and xylem with sieve-tubes and companion cells
	2. Sclerechyma fibers and parenchyma cells
	3. Phloem carrying photosynthesis products and xylem carrying water with dissolved nutrients
	4. Phloem carrying water with dissolved nutrients and xylem carrying photosynthesis products.

coraldolphin670

Biology 2601A/B Lecture : Moving Water in Plants study guide that includes all the notes and relevant pictures from lecture as well as additional notes from the assigned readings

Document Summary

Get access

Related Documents

Biology 2601A/B Lecture Notes - Lecture 11: Surface Tension, Sieve Tube Element, Vacuole

Biology 2601A/B Lecture Notes - Lecture 8: Phloem, Lignin, Transpiration

Biology 2601A/B Lecture Notes - Lecture 14: Vessel Element, Tracheid, Xylem

Related Questions