Sec 1 geog unit 3 lesson 1
Download as PPTX, PDF0 likes1,370 views
This document provides an overview of a lesson on tropical rainforests. It begins by stating the learning objectives which are to identify and describe the characteristics and layers of a tropical rainforest. It then asks questions about tropical rainforests and deforestation. The key points covered include that rainforests have the highest plant diversity, a three-layered structure consisting of an emergent, canopy and forest floor layer, and that plants have adaptations like broad leaves and buttress roots to survive in the hot, wet conditions. Students are assigned homework to sketch a rainforest leaf.
Sec 1 geog unit 3 lesson 1
- 1. Sec 1 Unit 3 Lesson 1 Tropical Rainforest
- 2. At the end of the lesson you will be able to : 1.Identify a tropical rainforest 2.List the characteristics of a tropical rainforest 3.Label and describe the layers of a tropical rainforest.
- 3. How can we save tropical rainforest? ◦ What are tropical rainforests? ◦ What is deforestation? ◦ Where are tropical rainforests found? ◦ Which areas have been deforested? ◦ Why do we deforest? ◦ How should we manage deforestation?
- 4. Take 2 minutes, read the poem Lets listen to a rainforest.
- 5. Earth’s oldest ecosystem. High rainfall and high temperatures throughout the year. Thick, luxuriant evergreen forests. ◦ Evergreen = no distinct shedding season.
- 6. 1. Diversity of types 2. Structure of rainforest 3. Plant Adaptations
- 7. Highest plant diversity in all forest types. Warm temperatures and constant rainfall encourages plant growth. Over 300 species in 0.01sq km Source of common local food ◦ Bananas, mangoes, pepper, cinnamo n, corn, pandan, walnuts
- 8. Plants grown to different heights Three-layered structure found in tropical rainforests
- 9. Trees up to 50m talls. Clearly visible from above Trees that rise above the even canopy below. Trees tend to have tall, straight and smooth trunks. Tualang, Kapok tree.
- 10. Layer of trees that grow to between 20 – 30m The crowns form an interlocking layer. Blocks 90% of sunlight from the forest floor. Deflects most rainfall.
- 11. Dark most of the day as sun rays are blocked by canopy. Plants tend to be small and widely-spaced apart. Vegetation is sparse on forest floor, mostly decomposing leaves.
- 12. Epiphytes grow on trees to receive more sunlight. ◦Ferns, orchids, mosses Lianas are woody vines that twine up trees for more sunlight. ◦Monkey ladder vine
- 16. Plants adapt to the climatic conditions with special features. Without adaptations, they will not survive the high temperatures and heavy rainfall. PG 78
- 17. Tall straight trunks Branches spread out near the top to reach for sunlight. Smooth bark to allow rainwater to flow easily down to the roots.
- 19. Broad leaves to capture more sunlight Waxy, leathery or hairy surfaces to minimise water loss. Drip tips to allow water to runoff. ◦ Reduces the growth of fungi and bacteria
- 20. Waxy surface Drip tip Hairy surface
- 21. Still air and lack of wind is bad for seed dispersal. Strong smelling flowers and fruit encourage animal and insect pollination.
- 23. Large spread roots that grow up to 5m above the ground. ◦ Help to support the tall emergent and canopy trees Shallow roots that reach for the nutrients in the topsoil and decomposing foliage. Constant presence of water, no need for deep roots that search for ground water.
- 26. By the next lesson, pick a leaf that you think is from a rainforest tree and sketch it on a piece of blank paper. Submit both the leaf and the paper as your homework.
- 27. Complete the test in the time allocated. Remember to write in black ink. If you are drawing diagrams, you can use pencil.
Editor's Notes
- #5: Click on pic to launch clip with rainforest sounds…(58 mins)http://www.youtube.com/watch?v=LTiRw7kx97E