Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The leaf is known as the 'Kitchen' or 'Food Factory' of the plant because it prepares food through the process of photosynthesis.
A leaf consists of several parts: the leaf blade (Lamina), the stalk (Petiole), the main vein (Midrib), and side veins which transport and minerals.
Stomata are tiny pores found mostly on the underside of the leaf that help in the exchange of gases like Carbon Dioxide () and Oxygen ().
Photosynthesis is the process by which green plants make food using , , and Sunlight in the presence of Chlorophyll.
Chlorophyll is a green pigment that captures solar energy. Without it, the plant cannot produce (Glucose).
Transpiration is the process where plants release excess water in the form of water vapor through the stomata.
The food prepared by the plant is a simple sugar called glucose, but it is stored in the form of a complex carbohydrate called Starch.
📐Formulae
💡Examples
Problem 1:
Identify the gas released by plants during photosynthesis that is essential for the survival of animals.
Solution:
Oxygen ()
Explanation:
During photosynthesis, plants take in and release as a byproduct, which animals and humans need for breathing.
Problem 2:
What will happen to a leaf if it is kept in a dark room for 48 hours and then tested with Iodine solution?
Solution:
The leaf will not turn blue-black; it will show a brownish color.
Explanation:
In the dark, the leaf cannot perform photosynthesis due to lack of sunlight. Therefore, no starch is produced. Since Iodine only turns blue-black in the presence of starch, the test will be negative.
Problem 3:
Why are leaves generally green in color?
Solution:
Due to the presence of Chlorophyll.
Explanation:
Chlorophyll is a green-colored pigment that helps the plant absorb energy from sunlight to synthesize food.