Science 7 Unit D: Plants for Food & Fibre. Topic 3. Plant Reproduction and Breeding. pp WORKBOOK. Name:

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1 Science 7 Unit D: Plants for Food & Fibre Topic 3 Plant Reproduction and Breeding pp WORKBOOK Name:

2 Read p. 115 people choose specific plants with particular characteristics and encourage them to reproduce plants are bred for many reasons: o hardiness ability to withstand environmental conditions o yield amount of food or fibre they produce o disease resistance o ability to store and transport Read Did You Know p. 116 Read Across Canada p. 116 Read Did You Know p. 117 Read p. 117 scientists can go inside a plant cell and change the genetic material o part of the cell that control an organism s characteristics i.e. genetic material, like DNA scientists combine the genes of two or more plants to create a new plant with the characteristics of the original plants o also called 1

3 Read Off the Wall p. 118 Read p. 118 Types of Plant Reproduction 1) involves the production of seeds and fruits from the specialized male and female cells. 2) occurs when a parent plant grows new plants from its roots, stems, or leaves without male and female cells. also called Asexual Reproduction useful technique for farmers or gardeners young plants are identical to the parent many trees spread by producing new plants from their roots some plants can also reproduce from their stems o a branch of the parent plant is bent down to the ground and partly covered with soil. Roots form on the buried stem and eventually a new plant grows that can be cut away and replanted. means to take a branch from one tree and attach it to another tree o often used with fruit trees and roses small sections of leaf and stem cut from a parent plant o can also be used to grow new plants and guarantee that plants produced will be the same as the parent plant 2

4 Read pp Sexual Reproduction when plants reproduce sexually the resulting plants are slightly different from their parents these differences help the plant adapt to changes in their environment part of the tree that has a series of woody scales o cone bearing trees produce male and female cones o female cones contain ovules (eggs) o male cones are smaller and hold pollen grains that contain sperm o process of pollen traveling to the female cone o See Figure 2.30 p. 120 Flowers play an important role in sexual reproduction o large flowers with bright colored petals often attract animals and insects o these animals pollinate the flowers while feeding on the nectar and pollen o flowers that are not brightly colored often depend on wind to spread their pollen o flowers that open at night often use scents to guide insects and other pollinators to them TASK: Answer the Stretch Your Mind question on p

5 Read p. 122 Parts of a Flower See Figure 2.33 p. 122 Most flowers need male and female parts for reproduction male part of a flower that has two main parts o tip that produces and stores pollen o stalk that supports the anther female part of a flower that has three main parts o sticky tip of the pistil that captures pollen grains o tiny chamber at the bottom of the pistil sacs (eggs) containing female reproductive cells o stalk that connects the stigma to the ovary brightly colored part that advertise the flower s nectar or pollen green part found underneath that protected flower before opening Read Off the Wall p

6 Flowers and Reproduction BLM 2-15 Goal: Understand flower structure and the processes of pollination and fertilization. What to Do Answer the following questions in the space provided. Refer to Figure 2.33 p. 122 for help. 1. Label each flower part on the diagram below. Then write a note in the space provided indicating the function of each. J. 2. occurs when pollen has been transferred from the anther to the stigma. When the pollen grain germinates on the stigma it creates a burrow called the pollen tube as it travels toward the ovary. 3. When the sperm cell from the pollen grain reaches the it joins with the ovule (egg). This is called fertilization. 4. must take place before can occur. 5. The fertilized ovule will become a tiny new plant inside the seed. We call this tiny new plant the. 5

7 Read Did You Know p. 124 Read pp Pollination pollination can happen several ways: o sperm fertilizes the eggs in the same plant o eggs of one plant are fertilized by the sperm of another plant from the same species bees pollinate more crops than any other insect once a plant has been pollinated, a seed is formed inside the seed is a tiny living plant called an and a food reserve to keep it alive a seed coat protects the embryo and its food growing ovary of the plant that swells and protects the developing seeds of a plant until they are ripe Read Did You Know p. 125 Read Did You Know p. 126 Read p. 127 transport of seeds away from the parent plant o Methods of dispersal include wind, moving water, animal feces, animal coats, and fire. once the seed is dispersed and it reaches the ground, it stays inactive until conditions are right for its growth Read p. 128 development of a seed into a new plant o See Figure 2.39 p

8 Grow Your Vocabulary BLM 2-17 Vocabulary Check What to Do Find and circle the words below in the word search. Beside each work write what you think it means or provide an example of it from your text. HABITAT CHEMICAL ADAPT YIELD HARDINESS FUNCTION STEM ENERGY STRUCTURE VARIETY C H E M I C A L O S F U N C T I O N H T A G U S E A A H A R D I N E S S A P Z U E C H D T B S G R C E N O E I R G U P T L K M T Y I E L D U J M A D A P T Q X R P T V A R I E T Y E A G U S D N A H C 7

9 Complete Topic 3 Review Questions p. 130 #1-5 Please record your answers below or on an attached sheet of loose leaf. 8

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