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Examining Parts of a Plant 8 th Grade Exploring Agriculture Resources:

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1 Examining Parts of a Plant 8 th Grade Exploring Agriculture Resources: http://www.mbgnet.net/bioplants/parts.html http://www.mbgnet.net/bioplants/parts.html

2 Student Learning Objectives 1. Describe the parts of the plant. 2. Identify the reproductive structures of plants that exist in the flower. 3. Describe the difference between monocot and dicot flowers. 4. Explain the difference between pollination and fertilization. 5. Describe environmental factors that can influence the beginning of the flowering process.

3 Terms Anther Anthesis Complete flower Dicot Fertilization Filament Flower Fruit Imperfect flower Incomplete flower Leaves Monocot Ovaries Ovule Perfect flower Petal Photoperiodism Phytochrome Pistil Pistillate flower

4 Terms cont. Pollen Pollination Roots Seeds Sepal Stamen Staminate flower Stems Stigma Style Vernalization

5 Parts of a Plant Roots Roots act like straws absorbing water and minerals from the soil. Tiny root hairs stick out of the root, helping in the absorption. Roots help to anchor the plant in the soil so it does not fall over. Roots also store extra food for future use.

6 Stems Stems do many things. They support the plant. They act like the plant's plumbing system, conducting water and nutrients from the roots and food in the form of glucose from the leaves to other plant parts. Stems can be herbaceous like the bendable stem of a daisy or woody like the trunk of an oak tree. Parts of a Plant

7 Types of Stems Herbaceous: Plants with stems that are usually soft and bendable. Herbaceous stems die back to the ground every year. Woody: Plants with stems, such as tree trunks, that are hard and do not bend easily. Woody stems usually don't die back to the ground each year.

8 Celery Sticks A celery stalk, the part of celery that we eat, is a special part of the leaf structure called a petiole. A petiole is a small stalk attaching the leaf blade of a plant to the stem. In celery, the petiole serves many of the same functions as a stem. It's easy to see the "pipes" that conduct water and nutrients in a stalk of celery. Here the "pipes" are dyed red so you can easily see them

9 Parts of a Plant Leaves Most plants' food is made in their leaves. Leaves are designed to capture sunlight which the plant uses to make food through a process called photosynthesis.

10 Parts of a Plant Flowers Flowers are the reproductive part of most plants. Flowers contain pollen and tiny eggs called ovules. After pollination of the flower and fertilization of the ovule, the ovule develops into a fruit.

11 Parts of a Flower Flower - reproductive part of flowering plants

12 Parts of a Flower cont… Sepals - green-like structures beneath the petals; offer protection to developing bud Sepal

13 Parts of a Flower cont… Petals - usually brightly colored; attract pollinators Petal

14 Parts of a Flower cont… Stamens - male reproductive part of flower Stamen

15 Parts of a Flower cont… Pistil - female reproductive part of the flower Pistil

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17 Reproductive Structures Stamen Anther - produces the pollen Filament - stalk which supports the anther

18 Reproductive Structures cont… Pistil Stigma - has sticky surface to capture pollen Style - tube-like; connects stigma with the ovary Ovary - contains the ovules

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20 Groups of flowers Complete flower - has all four major parts (sepals, petals, stamens, and pistils). Incomplete flower - lack one or more of the major parts Perfect flower – contains both stamens and pistils

21 Groups of flowers cont… Imperfect flower - lacks either stamens or pistils Pistillate flower - has pistils but no stamens Staminate flower - has stamens but no pistils

22 Monocot vs. Dicot Monocots - flower parts in multiples of 3 Dicots - flower parts in multiples of 4 or 5

23 Pollination and Fertilization Pollination - when a pollinator transfers pollen grains from anther to stigma Fertilization - when pollen fuses with the egg cell VIDEO: http://www.unitedstreaming.com http://www.unitedstreaming.com Keyword: Pollen Trip; Title: The Pollen Trip

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25 Influence on Flower Formation Photoperiodism - growth response of a plant to the length of day Vernalization - process by which floral induction in some plants is promoted by exposing the plants to cool temperatures for a certain length of time

26 Phytochrome - pigment in cytoplasm of green plants; associated with the absorption of light that affects growth, development, and differentiation including flowering of a plant, independent of photosynthesis Anthesis - release of pollen from the anther

27 Parts of a Plant Fruit Fruit provides a covering for seeds. Fruit can be fleshy like an apple or hard like a nut. Seeds Seeds contain new plants. Seeds form in fruit.

28 Review/Summary What are the major parts of flowers? What reproductive structures exist in the flower and what are their functions? How is a monocot flower different from a dicot flower? What is the difference between pollination and fertilization? Describe environmental factors that can influence the beginning of the flowering process.


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