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

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3 Feb 2021

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Water and fluid transport: moving fluids in plants: we will specifically be talking about how water is moved in plants from the roots up to the leaves, where it"s lost through transpiration. And phloem is moving materials from wherever they are produced (source tissue) to wherever they"re being used (sink tissue) Xylem: made of tracheids & vessel elements, these are dead cells. Both tracheids and vessel elements are interconnected (they line up next to each other laterally and that"s both the case for both of these_ For tracheids, at the very end of them they taper down and what you"ll get is them lining up edge to edge so that water can flow through the pits from one tracheid to the next one. Tracheids: secondary in angiosperms, primary vessel type in gymnosperms, have permeable pit membranes, allows lateral movement to provide long connected vessels.

Related Questions

11. As energy flows through the food web in an ecosystem, the amount of energy that is transferred from one trophic level to the next trophic level increases. stays the same. decreases. may increase or decrease, depending upon the system.

12. Autotrophs are organisms that obtain energy by breaking down tissues of organisms that have died. harness external energy sources to produce complex chemical compounds. depend directly on primary producers for their energy and nutrients. eat other autotrophs to obtain energy.

13. Which of the following gives the correct order for energy flow through an ecosystem? primary producers â secondary producers â tertiary producers primary consumers â primary producers â secondary producers secondary consumers â primary consumers â primary producers primary producers â primary consumers â secondary consumers

14. Which one of the following aspects of plant biology is not directly involved in maintaining an adequate supply of water for the entire plant? phloem roots xylem transpiration pull

15. Which structure(s) do most plants use to acquire the energy that they need for cellular processes? the roots the leaves the stem

1. In order for blood to always flow unidirectionally through a closed circulatory system, the ________.

a. capillaries must have a thick endothelium

b. arteries must be elastic

c.pressure in all vessels must be equal

d.blood vessels farthest from the heart must have valves

2. Which one of the following does not correctly match the form with its function?

a. roots: water and minerals in the soil are absorbed

b. phloem sap: products of photosynthesis are transported from roots to shoots

c. leaves: sugars are produced by photosynthesis

d. xylem sap: water and minerals are transported from shoots to roots

3. If you place flaccid plant cells in pure water, water ________ into cell because it has ________.

a. does not enter the cell; solutes and low water potential

b. enter the cell; solutes and high water potential

c. enter the cell; solutes and low water potential

d. does not enter the cell; solutes and high water potential

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6. Which of the following would not be true of a wind pollinated species of plant? It would produce large amounts of pollen. It's flowers would produce large amounts of nectar. Members of the species would grow relatively close together. It would produce small, inconspicuous flowers.

7. _______ is the pigment that allows plants to respond to changes in daylength. Chlorophyll Auxin Melanin Phytochrome

8. Plants use their roots to acquire nutrients from the soil. Minerals must enter the roots through ____________ while water enters roots through ___________. active transport; active transport osmosis; active transport active transport; osmosis osmosis; osmosis

9. When a personâs diet is missing a certain nutrient or nutrients, they are said to be ______________. undernurished malnurished anorexic all of the above are true

10. Chemosynthesis refers to a process that is carried out by almost all plants. bacteria that live at deep-sea hydrothermal vents. plants specialized to live in the desert. fungi in tropical rain forests.

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

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