Course Hero Logo

Cells they contain many chloroplasts and their

Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 29 - 31 out of 52 pages.

cells. They contain many chloroplasts, and their location below the epidermis and theirshape give them maximum exposure to light. Most photosynthesis takes place in thepalisade mesophyll.Below the palisade mesophyll layer is thespongy mesophyll.In this layer, theparenchyma cells are irregularly shaped and loosely packed. The open air spacesbetween the cells in the spongy mesophyll allow oxygen, carbon dioxide, and watervapour to move easily around the cells. Cells in the spongy mesophyll also containchloroplasts, but there are fewer of these per cell than in the palisade mesophyll layer.palisade-mesophyll cell1epidermis556MHR· Unit 5 Plants: Anatomy, Growth, and Function
...Identifying LeavesThe diferences in the size, shape, and texture of leaves are all clues that can help toidentif a plant species.Table1 3.5shows some of the characteristics used to describeand identify leaves. The blade of a simple leaf is not divided into smaller parts. Teblades of compound leaves are divided into smaller leaflets.A leaf 'svenationis the pattern of the veins in the leaf. Monocots, such as grassesand irises, usually have parallel venation, in which the veins in the leaf run parallelto the main, or central, vein and each other. Dicots usually have palmate or pinnateleaves like those shown inTable1 3.5.Palmate leaves have veins that branch of from acommon point. Pinnate leaves have veins that branch of along the central vein.Te arrangement of leaves on the stem, which is also shown inTable1 3.5,is anothercharacteristic that can be used to identif plants. Leaf growth isoppositeif two leavesare attached to the stem directly opposite each other at the same level.Alternategrowthdescribes leaves arranged in a step-like pattern on either side of the stem, with each leafat a diferent level. In awhorledarrangement, three or more leaves are evenly spacedaround a stem at the same level.Table1 3.5Characteristics Used to Identify LeavesLeaf TypeSimplePalmateOppositeAlternatePinnateCompoundLearning Checkvenationthe patternof veins in a leaf19.Describe a herbaceous stem.20.You are serving potatoes for dinner, and your friendcomments on how much she enjoys eating rootvegetables. How is her statement inaccurate?23.Provide a possible explanation for the fact that thereare fewer chloroplasts in the spongy mesophyll layerof a leaf than in the palisade mesophyll layer.21.What is the function of the cuticle?22.Predict why the air spaces in the spongy mesophyllare particularly large near the epidermis, asillustrated inFigure1 324.Trees have woody stems, whereas annuals (plantsthat complete their life cycle in one growingseason or less) have herbaceous stems. Providean explanation for this diference..1 9.

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 52 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
N/A
Tags
Photosynthesis, Vascular plant, vascular tissue, Canadian society

Newly uploaded documents

Show More

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture