Integrated Science
Form 2
Leaves
1. Complete table 1. Listing the importance of specific plants.
Plants
Importance of plants
Cultivated in St. Lucia
Gylricida, African star,
pangola,nut grass, water grass,
Animal feed / ration
Yes
Elephant Grass
Animal Feed
Yes
Bamboo
Used for Scaffolding
Yes
Thyme
Medicinal Uses/ Used as
Seasoning
Decorative purposes
Yes
For Human
consumption/nutrition
Yes
Anthurium Lily
Pumpkin
Yes
2. Use your text book, examine the structure of a compound leaf and a simple leaf. Walk outside,
each student must bring in a complete specimen of a compound leaf and the simple leaf. Draw
and annotate the simple and compound leaf. Use the mark scheme as a guide to draw the
specimen. All drawings must be done with a pencil.
Table 2. Mark scheme of drawing of simple and compound leaf.
Criteria
Large drawings
Clear continuous line
Lines of even thickness
More than three annotation
Title written in cap below the drawing (pencil)
Label to the left of the drawing
No arrow heads
Lines are drawn neatly with ruler
Parts are proportionate
Correct magnification
No shading
Marks
Home assignment
a) Define the term photosynthesis
Photosynthesis is the process by which plants use sunlight, water and carbon dioxide to make
glucose, which is a form of sugar that plants need to survive.
b) Write both the word and the chemical equation for photosynthesis
Chemical Equation= 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2
Word Equation= Carbon Dioxide + Water + Sunlight = Glucose and Oxygen
c) Describe how the structure of the leaf facilitates photosynthesis.
The way in which leaves facilitate photosynthesis is by having a large surface area which contain
openings, called stomata to allow carbon dioxide into the leaf and oxygen out. The leaf also has
chlorophyll which traps sunlight to aid the process of Photosynthesis.
d.) What is the role of chlorophyll?
Chlorophyll’s role is to absorb sunlight, so that it could use this stored energy from the sunlight
to convert carbon dioxide and water into glucose.
e.) List factors that increase and decrease Photosynthesis.
Light intensity, carbon dioxide concentration and temperature.