TEST 2 BIO - TEST 2 BIO Tissue Types: - Meristematic vs....

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TEST 2 BIO Tissue Types: -- Meristematic vs. Permanent Meristematic Undifferentiated and capable of dividing- found in tips of roots, shoots (meristems), and in buds, cambium layer in stems Permanent 1. Surface- epidermis(cuticle, root hairs, etc.) Peridermis(cork) 2. Ground- Parenchyma- thin walled—food storage, photosynthesis Collenchyma- uneven walls, thickened at corners—support Sclerenchyma- thick secondary walls—support, strength, form shell of nut 2. Vascular- xylem- tracheids and vessels for upward conduction of water and minerals Phloem- sieve tubes for downward conduction of food, made in leaves and stem, Companion cells(have a nucleus control sieve tubes but do not conduct) Leaf Structure- Upper epidermis and cuticle- sometimes contains guard cells Palisade layer- parenchyma cells full of chloroplasts for photosynthesis Spongy layer- more parenchyma cells not tightly packed and with many fewer chloroplasts—allows for gases to move around and through them Lower Epidermis- surface tissue which contains many guard cells which when open form stomata which allow for gas exchange Types Simple vs complex Leaf venation: netted(dicot) 2 types: pinnate- 1 central vein; palmate- 2+ central veins that all come from the same place Parallel(monocot) Leaf edges: entire(smooth), toothed(serrated), and lobed Root Structure X-section(outside in) Epidermis and root hairs Cortex- parenchyma cells which store food Endodermis and casparian strip form outer boundary of central cylinder(stele) Pericycle- inside stele, meristematic tissue
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TEST 2 BIO - TEST 2 BIO Tissue Types: - Meristematic vs....

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