Lesson Notes By Weeks and Term - Primary 5

WEEK 6

SUBJECT: AGRICULTURAL SCIENCE

TERM: 1ST TERM

CLASS: PRIMARY 5

Classification according to Lifespan

Crops can be grouped according to their life span as follows: annuals, biennials and perennials.�

Annuals

These are plants that perform their entire life cycle from seed to flower to seed within a single growing season. All roots, stems and leaves of the plant die annually. Examples are lettuce, and spinach

Annual crops are crops that grow and live for about one year. Many vegetables belong to this group. Examples include tomato, amaranthus, okra, onion and carrot. Other crops in this group are yam, maize, rice, groundnut, millet, garden egg, sorghum, cassava and potato.

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Biennials

These are plants which require two years to complete their life cycle.

Examples are onions, carrot, and cabbage

Biennial crops are crops that live for two years after germination and produce seeds or fruits in the second year. Examples are castor oil, pepper, alligator pepper, plantain, banana, sugarcane, pineapple and pawpaw.

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Perennials

These are crops that persist for many growing seasons. Examples are cashew trees, palm trees, and banana trees.

Perennial crops are plants or crops that live and produce for more than two years after germination. Examples of such crops are the oil palm, cocoa, mango, citrus, guava and kola.