Introduction To Plant Science

1. Introduction To Plant Science Introduction To AgriScience and Technology GHS Mr. Ham

2. Objective 1.1What roles do plants serve in the ecosystem • Plants serve several roles in our ecosystem by providing the following items: • Oxygen • Food • Reduce soil erosion • Medicines

3. Objective 1.2How plant differ from animal • Plants differ from animals in several ways • Plants produce their own food with the aid of nutrients from the soil. • Plants are stationary. • Plants have rigid cell walls with cell membranes inside. • Plants utilize carbon dioxide and give off oxygen.

4. Objective 1.3List how plants and animals are alike. • Plants and animals are alike in several ways. • They have a life cycle. • They carry on life processes, such as circulation, respiration and growth. • They are made of cells. • They must have food.

5. Objective 1.4List three major factors that affect plant growth • Major factors in climate that effect plant growth include: • Temperature • Warm season plants start growing in the spring and finish in the fall. I.e., bananas, oranges, cotton and corn. • Cool season plants have a life cycle that begins in the fall and ends when summer begins. I.e., wheat, rye, and oats.

6. Objective 1.4 (cont.) • Precipitation • Light

7. Objective 1.5Define life cycle in terms of plants and how they are classified • Life Cycle: refers to the length of the plant’s life. • Plants can be classified into three groups on the basis of their life cycle: • Annuals- complete life within one year. • Biennials- complete life cycle in two years. • Perennials- plants live for more than two years. • Deciduous- plants that lose their leaves in the winter. • Evergreens- plants that retain their leaves year round. • *Plants may be perennials but only used as an annual in the agricultural industry. I.e. cotton

8. Objective 1.6List the different parts of a plant • Parts of the plants are of two major kinds: • Vegetative • Leaves- makes food for the plant through a process known as photosynthesis. • Blade -Veins • Epidermis -Stomata • Internal cells -Waxy coating • Petiole -Stipule

9. Parts of a Leaf Waxy Coating Stomata Stipule Stipule Petiole Petiole Vein

10. Objective 1.7List the two different types of leaves • Leaves are divided into two groups: • Simple • Compound

11. Simple Leaf

12. Compound Leaf

13. Objective 1.8List the three ways leaves attach to the stem • Leaves attach to the stem in several different ways. • Alternate • Opposite • Whorled

14. AlternateAttachment

15. Opposite Attachment

16. Whorled Attachment

17. Objective 1.9List the different functions of the stem • The stem supports the leaves and flowers. • The stem transport water and other materials. • The stems also store food.

18. Objective 1.10List the different parts of the stem • Bark • Cortex • Phloem • Cambium • Xylem • Pith

20. Xylem & Pholem

21. Objective 1.11List the types and roles of roots • Role of roots • Roots anchor the plant. • Roots take in water and minerals. • Roots store energy. • Types of roots • Taproots • Fibrous roots

22. Taproot

23. Fibrous Root

24. Taproot vs. Fibrous