Differentiate between humification and mineralization.
Differentiate between humification and mineralization.
Humification: The process of formation of humus during decomposition of organic material in soils is known as humification.
Mineralization: The decomposition or oxidation of the chemical compounds in organic matter into forms that are accessible by plants is known as mineralization.
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Mention three different ways in which insect pests can attack the crop plant.
| Column I | Column II | ||
| a. | Fungal disease | i. | Dengue fever |
| b. | Viral disease | ii. | Cholera |
| c. | Protozoan disease | iii. | Skin disease |
| d. | Bacterial disease | iv. | Malaria |
Mention any three human activities which are responsible for depletion of the ozone layer.
List a fer'flight adaptations in birds.
Give an account of structure and function of xylem.
Mention differences between light microscope and electron microscope.