ASEI Lesson Plan on Biology

1. to identify the two major groups the plants' A and B belong to.
2. List down the external observation that helped you to classify the two plants.
3. Looking at the chart showing the internal structure of the monocotyledonous stem, predict which of the labelled parts would be stained red with the dye. Give your explanation for the answer you have given.

The teacher draws a table and list down the differences.

Learners observe the two plants and identify the groups the plant belongs to.

1. Plant A: monocotyledonous plant,
2. Plant B: dicotyledonous plant.

1. Monocotyledonous plants have parallel venation while dicotyledonous have network venation.
2. Monocotyledonous plants have narrow leaves while dicotyledonous have broad leaves.
3. Monocotyledonous plants have fibrous roots while dicotyledonous plants have a tap root system.

1. Which of the part labelled would have stained red with the dye? And why?
2. What is the part that transports water and mineral salts
3. Identify the two types of tissues in V/bundle

Learners observe the two plants and notice what has happened to the red dye.

Learners look at the chart of a plan diagram of the internal structure of the monocotyledonous stem.

1. The red dye has moved through the root, stem to the leaves.
2. The vascular bundle is the part that transports water and mineral salts.
3. the two types of tissues in V/bundle are Xylem and phloem.

Activity 2 (Sectioning):

The teacher provides material, apparatus and students worksheets.
The teacher gives brief instruction and necessary CAUTION.

Teacher guide learners to perform the following activity;

1. Cut a slit in a potato tuber.
2. Insert a piece of the stem of the dicotyledonous plant between the potatoes slit, for firm holding of the stem.
3. Cut suitable thin transverse sections through a dicotyledonous stem.
4. Keep the sections in water in a Petri dish.
5. Select the thinnest section from the Petri dish, mount on the slide, and place a coverslip.
6. Examine the section under the microscope (low power objective, then medium power objective).
7. Draw a large labelled plan diagram of the section.

The learners form working groups.

Learners observe sections under the light microscope.

For the vascular bundle of the stem to be seen learners must cut the transverse section.

The specimen should be very thin to pass through light.

1. - In which tissue are the cells coloured red?
2. How do you explain this?

1. Xylem is the part that is coloured red.
2. Dye dissolved in water and moved through the stem.

1. generalize the internal structure of a stem of a dicotyledonous plant using a chart.
2. compare the monocotyledonous and dicotyledonous internal structures of the stem.

1. Major plant tissues to be identified include vascular tissue (xylem and phloem), cortex, cambium and epidermis).
2. Organising the concepts through comparison and contrast
   Vascular bundles in dicotyledonous plants are arranged like a ring while those in monocotyledonous are scattered

1. Give a comparison between the internal structure of a monocotyledonous and a dicotyledonous stem.
2. Give a reason why each of the following steps is followed:
   1. Cutting very thin sections
   2. Using a sharp razor blade during the cutting
   3. Placing the sections in water
   4. Staining the sections before observing under the microscope