Pages from Grade 5 Active Science Textbook_.pdf

CHAPTER 1 Life Cycle of Flowering Plants The Science teacher gave the students some seeds an d instructions on a piec...

CHAPTER 1 Life Cycle of Flowering Plants The Science teacher gave the students some seeds an d instructions on a piece of notepaper. The instructions described how the seeds co uld be grown. Ada kept the seed s and the notepaper in her ba g. The next day, Ada takes her seeds out from her bag. New things are coming out of the seeds. Ada does no t know what has happened to the se eds. The notepaper is also damaged. My seeds have exploded! The notepaper is also damaged. What has happened to my seeds? What should I do to grow my seeds? stages What are the le of a What Will I Learn in the life cyc nt? flowering pla ✓ State that not all plants produce flowers. Which stage of th ✓ Identify the parts of a flower and describe their functions. e flowering plant’s life ✓ Identify the stages in the life cycle of a flowering plant. cycle is the green ✓ Describe seed germination and the conditions required for bean seed at? seeds to germinate. ✓ Describe what happens during reproduction in flowering plants. What do seeds need to grow into a young plant? 2 Chapter 1  How do we tell if a living thing is a plant? Retrace our steps What are the Do all plants have flowers? major parts of a flowering plant? What are their Let’s investigate! functions? 1 e : To identify plants and understand that ther Aim ants. are different types of pl Materials: Plant identification key Digital camera What type of plant is this? Plants that live on land Plants that do not live on land Produce flowers Do not produce flowers Have only Have long and Big and five... many... thin... round... Example of an identification key Instructions: 1 Go to a school garden or park near your school. 2 Go for a plant walk. Sketch or take photographs of things that you have identified as plants. 3 Sort your sketches or photographs. Classify the plants identified as flowering and non-flowering plants. 4 Identify the plants using the identification key provided. Questions: 1 Which characteristics did you use to identify plants? 2 Were there more flowering or non-flowering plants around your school? 3 Look at the non-flowering plants identified. What are their similarities? Life Cycle of Flowering Plants 3  In general, most plants have the following features: Retrace our steps Have leaves Are trees Have roots plants? How do Have a stem you tell? Plants are generally green because they have green-coloured substances known as chlorophyll to help them absorb light energy from the Sun to make food. Chlorophyll Some plants have flowers. They are classified as flowering plants. Flowers help the plants to reproduce. Flowers of these plants bloom when the plants mature or have grown to become adult plants. For many flowering plants, their flowers only last for a period of time. The flowers of a tomato plant will eventually become fruits. 4 Chapter 1  Cherry blossom tree Mango tree Cherry blossom trees and mango trees are examples of flowering plants. Some plants do not have flowers. Mosses, ferns and conifers are plants that do not have flowers. We classify them as non-flowering plants. They reproduce in other ways. Moss Fern Conifer Mosses, ferns and conifers are examples of non-flowering plants. Solve this! Look at these plants. Are they flowering or non-flowering plants? kboo k or Worksheet 1 W Life Cycle of Flowering Plants 5  What are the parts and functions of a flower? Flowers make plants attractive and beautiful. Flowers are also important in the reproduction process in flowering plants. Without flowers, many plants cannot reproduce and will become extinct. A flower has various parts. Each part plays an important role in the reproduction process. Stamen The stamen refers to the male reproductive organ of the flower. It consists of the anther and the filament. The anther contains pollen sacs. The pollen sacs have pollen grains. The filament holds the anther up. Cross-section of a flower Petals are usually colourful and have a sweet smell. This helps to attract insects and small animals to the flower. As plants cannot move, they depend on insects and small animals to help transfer the pollen grains from the male part to the female part of the flower during the reproduction process. 6 Chapter 1  Caution! Only use equipment given Do not run around with equipment  Take care of your hands when Think-Pair-Share using equipment Follow your teacher’s demonstration. Dissect a flower. Observe and sketch the parts of a flower. Research the name and function of each part of a flower. Next, look at your classmate's flower. Can you find similar flower parts in your classmate's flower? Carpel The carpel refers to the female reproductive organ of the flower. It consists of the stigma, style and ovary. During reproduction, pollen grains will stick to the stigma. The style is a tube that connects the stigma to the ovary. If the reproduction process is successful, the ovary will develop into a fruit which contains seeds. The sepal is the outer part of the flower that protects the flower bud before the flower blooms. Flower bud Clues Dissect – To cut open something and study its structure Life Cycle of Flowering Plants 7