Life Cycle of a Plant: Observation Day 7

Sunday, April 25, 2010

Observation Day 7

My plant has grown even more since the last observation day. No buds or flowers have appeared yet, however the shoot tip at the top of the plant is now distinct and noticeable which may mean that flowers may soon be coming. There now appears to be 4 developing, healthy leaves on my Brassica Rapa displaying some signs of net venation, as you are able to see the ridges of the veins, scattered throughout the leaf blade.

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Related Information

Leaves:

Leaves:

Leaves are known as one of the major sites of photosynthesis.

Diagram of a plant:

Helpful Definitions:

Meristems: Area of a plant where some cells retain the ability to repeatedly by mitosis.

Aprical Meristems: Regions at the plants tips of all roots and shoots. Responsible for primary growth that throughout the life of the plant lengthens the shoots and roots.

Lateral Meristems: Cylindrical regions in roots and stems. The increased diameter of roots and shoots is the result of these.

Vascular Cambium: A lateral meristem that is responsible for producing new phloem and xylem tissue within the plant.

Photosynthesis: The process in which plants use chlorophyll to trap the energy from sunlight and use it to produce carbohydrates.

Primary Growth: All growth in the length of roots and stems that occur throughout the plants entire life and all growth in the diameter of roots and stems within the 1st year of the plants life.

Secondary Growth: Plant growth that takes place at lateral meristems which result in increased diameters of roots and stems in the second and subsequent years of a plants life.

Epidermis: The outer layer of a multicellular plant that experiences primary growth.

Periderm: A protective coating that replaces the epidermis in plants that live after its primary growth.

Axillary Bud: A new bud born on the axil of a leaf that will later on branch into a shoot or flower cluster.

Pollination: In flowering plants, pollen is transferred from the anther of the plant to the stigma, often by the wind or by insects such as bees. This process happens in order for plants to develop seeds later on in their life cycle.

Nodes: The location in which leaves are attached to the stem.

Internode: The space between two nodes on the same side of a plants stem.

Simple Leaf: A leaf that is not divided into two or more leaflets.

Compound Leaf: A leaf that is divided into two or more leaflets.

* see below image:

- all leaves in group a are simple leaves
- all leaves in group b are compound leaves.

( above information & pictures are a revised version from "Nelson Biology 11" textbook )