Grade 5 | Science | Pollination and How Fruits Grow | Chapter 5 - Lesson 3

شرح ساينس الصف الخامس الابتدائي لغات - الفصل الدراسي الاول شرح ساينس خامسة ابتدائي - ترم اول لينك جروب الواتساب https://whatsapp.com/channel/0029Vaed... لينك تليجرام https://t.me/mrahmedelbashagroup In This Lesson: Plant Growth and Maturity: As a plant grows and reaches maturity, it begins to form flowers to reproduce and produce seeds. Some plants carry two types of flowers with distinct structures: male flowers, which carry the stamen that produces pollen grains, and female flowers, which contain the pistil to receive those pollen grains. The Importance of Pollination: Pollination is the transfer of pollen grains from the male flower to the tip of a pistil on a female flower. This is a crucial step because a female flower cannot correctly begin forming fruit until pollen grains reach it. In nature, bugs like bees often act as pollinators by carrying these grains between flowers. Fruit Formation: After successful pollination occurs, the swelling located at the base of the female flower's pistil begins to grow gradually. This swelling turns into a fruit that contains seeds inside; when these seeds are planted, they can sprout into new plants, continuing the life cycle. Pollination Experiment: An activity demonstrates the necessity of pollination using a luffa plant. Two female flowers are covered with bags before they bloom (labeled A and B) to isolate them. Once bloomed, flower (A) is manually pollinated by transferring pollen from a male flower to its pistil using a small brush, and then re-bagged, while flower (B) is left covered and unpollinated. Experiment Results and Conclusion: A few days later, observation shows that the manually pollinated flower (A) begins to grow its base swelling, eventually forming a green cylindrical fruit containing seeds. In contrast, the unpollinated flower (B) shows no change and forms no fruit or seeds. This confirms that pollination is entirely necessary to complete reproduction and form seed-bearing fruit. بالتوفيق مستر احمد الباشا