Term
| What are the two main parts of a leaf? |
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Definition
| blade and petiole (stalk) |
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Term
| How much of a plant's weight is water? |
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Definition
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Term
| How much water does a plant lose through transpiration? |
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Definition
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Term
| What are the purposes of the petiole/stalk? |
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Definition
| orients leaves for maximum light interception, supports leaves; allows leaves to flutter in wind, bringing in fresh supplies of CO2 and regulating temperature |
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Term
| outermost layers, provides protection from pathogens, physical damage, and herbivores; minimizes water loss with the epidermis; usually one cell layer thick |
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Definition
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Term
| cells that resemble cobble stones, tightly packed to act as a barrier to water loss and microorganism invasion, clear cells with no chloroplast, have large vacuoles |
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Definition
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Term
secreted by epidermal cells; made of cutin and wax, water repellent lipids; seals off epidermis from atmosphere
blocks diffusion of gasses |
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Definition
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Term
| pair of cells that house the stoma, specialized to facilitate gas exchange, contain chloroplast, open and close at will, mostly on the lower epidermis to minimize transpiration |
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Definition
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Term
| outgrowth of the epidermis, either unicellular or multicellular |
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Definition
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Term
| What are the two types of trichomes? |
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Definition
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Term
| What are the functions of a trichome? |
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Definition
- defense
- temperature control
- seed dispersal
- getting rid of salt (in coastal areas)
- hair trigger (venus fly trap)
- attracting and trapping prey (carnivorous plants)
- secreting digestive enzymes (carnivorous plants)
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Term
specialized cells for photosynthesis, containing lots of chloroplasts |
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Definition
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Term
| 1-2 layers of cells below the upper epidermis |
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Definition
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Term
| irregularly shaped photosynthesis sites, lots of air spaces |
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Definition
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Term
| Why are there spaces in between spongy mesophyll? |
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Definition
| The spaces exist to allow uptake of carbon dioxide gas through simple diffusion |
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Term
| continuous network that runs through the petiole and the stem to the roots |
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Definition
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Term
| moves water and dissolved minerals throughout a plant |
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Definition
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Term
| transports sugar dissolved in water throughout the plant |
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Definition
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Term
| one of the cell types of xylem, found in all tracheophytes, thin and filled with pits, dead at maturity |
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Definition
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Term
| one of the cell types of xylem, only found in angiosperms, has an outer wall made of cellulose and an inner wall made of a rigid substance called lignin |
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Definition
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Term
| one of the cell types of phloem, barely alive at maturity, contains no nucleus, has thin and watery cytoplasm |
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Definition
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Term
| one of the types of phloem cells, only found in angiosperms, divided from one another by the sieve plate |
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Definition
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Term
| surrounds vascular tissue, has a few chloroplasts, tightly packed, regulates the movement of materials in and out of the vascular tissue |
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Definition
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