Plant Systems · SHS3 Biology

Lesson notes

Learning Objectives

Indicator: 3.4.2.LI.3 - Discuss excretion in flowering plants.

By the end of the lesson, learners can:

Define excretion in plants and distinguish it from egestion and secretion.
Identify the major waste products of flowering plants (carbon dioxide, oxygen, water, resins, latex, gums, tannins, and crystals) and state where each is produced or stored.
Explain at least three routes by which flowering plants remove or store waste products (diffusion through stomata and lenticels, storage in vacuoles, shedding of leaves, bark, and fruits, and secretion into soil).
Discuss why flowering plants do not need specialised excretory organs, comparing this with animals.
Assess the economic and ecological importance of plant waste products such as resins, latex, and gums in Ghanaian life.

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Curriculum details

Strand: Systems of Life (Strand 4)
Sub-strand: Plant Systems (4.2)
Content standard: 3.4.2.CS.1 - Demonstrate knowledge and understanding of excretion and reproduction in flowering plants. 3.4.2.LO.1 Describe reproduction and excretion and relate them to their importance in flowering plants.
Indicator: 3.4.2.LI.3 - Discuss excretion in flowering plants.
Suggested placement: Semester 2, Week 18 (Week 38 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 118

Exemplars (from the NaCCA curriculum)

Project-Based/Collaborative and Observational Learning: take the whole class on an educational trip around the school compound to assess different forms of plants and how they excrete waste materials. Each class member makes personal notes on the project for class group discussions: learners work independently to build confidence and self-assurance; learners learn from one another and offer emotional support.
Talk-for-Learning Approach Discuss: in their respective mixed-ability groups, learners discuss the importance of some named plant waste products (e.g., resins, latex, gum, carbon dioxide, water, oxygen, etc.) and how they are excreted. Groups discuss why, unlike animals, plants generally lack specialised excretory organs and structures for removing waste materials from their bodies.
Teaching and Learning Materials:
- * Flowers and fruits of the following plants: flamboyant, crotalaria/centrocema, pride of barbados, * Tridax should be provided for practical exercises. * Simulations
- * Videos * Posters and photos on reproduction flowering plants.
- and excretion in
Assessment (3.4.2.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 3 Strategic reasoning; Level 4 Extended critical thinking and reasoning.