Getting to Know Plants- Creating a leaf herbarium for monocot & dicot plants

Surekha Waldia
2 weeks
Critical thinking, Problem Solving
Remember, Understand, Application

Getting to Know Plants- Creating a leaf herbarium for monocot & dicot plants
Objective 1: Students will learn to observe different type of leaves and plants that are growing in their surroundings with more detailing.

Objective 2: Learn to apply the information read in books while doing this project and learn how observations are made in real life

Leaves of various plants, scrap book, glue stick, pencil and pens

Step 1: Ask students to collect leaves with different shapes size and venation. Give them the chart on attached above for their reference.
Step 2: let them dry these leaves collected for two-three days by pressing it in thier books.
Step3: Ask them to now segregate their collection on the following basis :
Types of venation- 1. Reticulate Venation:
When the veins are irregularly distributed to form a channel, it is known as Reticulate Venation.
It is the characteristic feature seen in dicots.
They are of two types:
a) Unicostate or Pinnate Reticulate:
Leaf having a single main mid-rib.
Example: Hibiscus, Mango
b) Multicostate or Palmate Reticulate:
Having two or more mid-ribs arising from a single point.
They are further divided as:
i) Multicostate convergent:
Many mid-ribs in a curved fashion from base of blade to its apex.
Example: Zizyphus (Beri)
ii) Multicostate divergent:
Many mid-ribs arise at the base of the leaf and then diverge from one another towards the margin.
Example: Papaya, Cucurbita
2. Parallel Venation: Veins are parallel and do not form a network.
They are of two types:
a) Unicostate or Pinnate parallel:
Lamina has a single prominent midrib from which lateral veins arise which run towards the margin.
Example: Canna, Banana
b) Multicostate or Palmate parallel:
Several leaves run parallel to each other.
They are further divided as:
i) Multicostate convergent:
Principal veins appear from the base of the lamina and converge at the apex.
Example: Bamboo
ii) Multicostate divergent:
Main veins appear from the base of the lamina and converge at the apex.
Example: Fan palm
Step 4: Along with the venation and their types students should mark the following for each leaf they have collected :
a) Margins
b) Shape
c) Leaf Apex
d) Arrangement of the leaf
e) Arrangement on stem
3. Furcate Venation: Dichotomous branched veins. Also known as forked venation.
Example: Nephrolepis (Fern)

Image result for image of leaves on margins

Reference Links:
Website to look in for your understanding:

http://theseedsite.co.uk/monocots2.html
Download File a) Why is a plant called monocot or a dicot plant?
b) Observing the leaves which they have collected can they differentiate between monocots and dicot plants. Why did they classify them as that.
c) If you get to see the stem and roots of these plants, can you differentiate whether they are monocots or dicots plants
Clearly explained, Complete, Knowledgeable, Methodical, Precise, Informative, Satisfying



Submit a Comment

Your email address will not be published. Required fields are marked *