Introduction To Plant Science Introduction To Agri Science

Introduction To Plant Science Introduction To Agri. Science

Objective 1. 1 What 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

Objective 1. 2 How 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.

Objective 1. 3 List 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.

Objective 1. 4 List 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.

Objective 1. 4 (cont. ) • Precipitation • Light

Objective 1. 5 Define 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

Objective 1. 6 List 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

Parts of a Leaf

Objective 1. 7 List the two different types of leaves • Leaves are divided into two groups: –Simple –Compound

Simple Leaf

Compound Leaf

Objective 1. 8 List the three ways leaves attach to the stem • Leaves attach to the stem in several different ways. –Alternate –Opposite –Whorled

Alternate Attachment •

Opposite Attachment •

Whorled Attachment

Objective 1. 9 List 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.

Objective 1. 10 List the different parts of the stem • Bark • Cortex • Phloem • Cambium • Xylem • Pith

Xylem & Pholem •

Objective 1. 11 List 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

Taproot

Fibrous Root

Taproot vs. Fibrous •