Reproduction In Plants
Overview
Every maize cob and every pod of beans began as a flower. Plants make the next generation in two very different ways. In sexual reproduction a flower brings male and female cells together to make seeds, mixing the qualities of two parents. In asexual reproduction a single plant grows a whole new plant from a piece of itself, a tuber or a cutting, with no seeds and no mixing at all. A farmer uses both: seeds to grow a maize field, cuttings to multiply a prized cassava.
In this lesson you will compare the wind-pollinated flower of maize with the insect-pollinated flower of a bean, follow pollen to the egg in fertilisation, and see how seeds and fruits are spread so that new plants are not crowded together. You will also learn why scattered weed seeds are so hard to control, and how planting tubers and cuttings lets a farmer copy a good plant exactly.
Objectives
- (a) define the term sexual reproduction.
- (b) describe the structure and functions of the flowers of a maize plant and of a bean plant.
- (c) define the term pollination.
- (d) describe the process of fertilisation in a named plant.
- (e) describe how seeds and fruits are dispersed and explain the importance of dispersal in relation to weed control.
- (f) describe asexual reproduction from stem tubers (e.g. Irish potato and yam) and from stem cuttings (e.g. sweet potato, cassava and sugar cane).
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Lesson Evaluation
Congratulations on completing the lesson on Reproduction In Plants. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Pollination is best described as the transfer of pollen from: A. One ovule to another B. An anther to a stigma C. The style to the ovary D. A seed to the soil Answer: B
- Which feature shows that a flower is wind-pollinated? A. Bright, scented petals B. A reward of nectar C. Large, feathery stigmas that hang outside D. Sticky pollen Answer: C
- Fertilisation in a flowering plant is the fusion of the: A. Anther and the filament B. Male nucleus and the female nucleus C. Stigma and the style D. Pollen and the petal Answer: B
- Which crop is normally grown from stem cuttings? A. Maize B. Bean C. Cassava D. Carrot Answer: C
- An advantage of growing a crop from tubers or cuttings is that the new plants are: A. More varied than the parent B. Identical to the parent C. Always disease-free D. Produced from seed Answer: B
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