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Leaves provide shade in the summer. They display beautiful colors in the fall. They sway in the breeze. Children jump in piles of leaves and collect them in the fall. More important, leaves harness the sun’s energy and enable our life on Earth. Objective: Examine the parts, organization, and types of leaves. Key Terms:
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Oct 15, 2017 · Structure of the leaf. A fully resourced lesson on the structure of the leaf. Can easily be adapted be suitable for either KS3 or KS4. Various worksheets are linked to the presentation, which also contains mini assessments and a good video.
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- INTRODUCTION
- 1.2 CELL WALL
- 1.3 CELL MEMBRANE
- chromatin.
- 1.8 ENDOPLASMIC RETICULUM
- 2.0 PLANT CELLS AND MERISTEMS
- 2.1 DEVELOPMENT OF A PLANT
- 2.2 GROUND TISSUES
- 2.3 VASCULAR TISSUES AND CELL TYPES
- 2.3.1 XYLEM
- 2.4 DERMAL TISSUES AND FEATURES
- ACKNOWLEDGEMENTS
The structure and functioning of plants, even that of massive 100-metre tall trees, is dependent on the structure of, and processes occurring in, microscopic cells. In this book we look at the major organelles in cells, the range of cell types in plants and how they are combined into tissues to create functioning leaves and other organs. Some cells...
The cell wall is initially deposited on the surface of the middle lamella. This primary cell wall occurs on the surface of all plant cells. It is substantially composed of cellulose molecules bundled together to form fibrils. The primary cell wall is the only cell wall present in some cells. In other cells a secondary cell wall is deposited inside ...
Immediately inside the cell wall there is a cell membrane surrounding the contents of the cell. It is made up of a phospholipid bilayer with proteins. The outer surface of the phospholipid layer is attracted by water (hydrophilic) whereas the tail of the phospholipid molecule is repelled by water (hydrophobic). The proteins may be embedded in the m...
The nuclear envelope is a double membrane that surrounds the nucleus. It contains pores that allow rapid communication between the cytoplasm of the cell and the nucleoplasm. Nucleoplasm is similar to the cytoplasm of the cell but contains more protein macromolecules and appears darker than the cytoplasm. The nucleolus is a roughly spherical body co...
The endoplasmic reticulum (ER) is a complex system of membranes, tubules, cisternae and vesicles, appearing in two types: smooth and rough ER. Smooth ER is comprised of interconnected vesicles and cisternae that do not contain ribosomes. Smooth ER is involved in sterol biosynthesis, detoxification reactions and fatty acid desaturation. Rough ER mem...
Plants create many different types of cells, which have various functions. Most new cells in are produced in specialised regions of tissue, called meristems. Primary growth occurs in the apical meristems of the shoots and roots. The cells of the apical meristem divide and expand and differentiate into all the various cell types of the plant.
The apical meristem produces new cells by cell division. These small squat cells divide and expand in size. They then differentiate into all the various cell types of the plant. The great variety of cell types in a plant can be divided into three broad tissue systems: the dermal, vascular and ground tissue systems.
The main tissue types of the ground tissue system are parenchyma, collenchyma and sclerenchyma. Parenchyma have thin walls of cellulose, whereas collenchyma have cell walls with thickened areas of additional cellulose. Sclerenchyma cells have lignified cell walls. They can be further categorised into narrow long cells (fibers) and cells of various ...
There are two vascular tissues in the vascular tissue system: xylem for water transport and phloem for transport of photosynthates.
The xylem is a complex tissue containing a range of cell types including: vessel cells, tracheids, fibers, parenchyma
The dermal tissue is largely composed of squat more or less cubic dermal cells, but it also contains specialist guard cells around the stomata, and various trichomes and root hairs.
The assistance of technical staff at the College of Engineering, IT and Environment, and of staff from the Innovative Media Production Studio at Charles Darwin University is acknowledged. The many publishers of microscope images, diagrams, drawings and photos, who have made their work freely available to share for educational purposes online are al...
A great way for students to summarise their knowledge of the structure of a leaf. For each diagram in the table students should name the part of the leaf and describe its function. Easy to download and print PDF. Answers included.
Oct 31, 2023 · The xylem consists of tracheids and vessels, which transport water and minerals to the leaves. The phloem transports the photosynthetic products from the leaf to the other parts of the plant. A single vascular bundle, no matter how large or small, always contains both xylem and phloem tissues.
Jan 28, 2019 · Leaf structure Yr 7. Structure of a leaf powerpoint. It starts with recall of plant cells, then covers each cell found in the leaf. Students are then given a worksheet with the leaf structure drawn and have to label it based on what they have learnt, this is a challenging lesson.
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This science lesson provides a practical life experience by introducing the child to the different shapes and colors of leaves. It guides the child about the structure of a leaf and its characteristics by labeling the different parts of the leaf, like the apex, veins, stem, etc.
