Sexual Reproduction In Plants (continued)
Overview
Pollination only delivers the pollen to the doorstep. The real union of male and female happens next, hidden inside the ovary, when a pollen nucleus fuses with a nucleus in an ovule. From that single fusion a whole new plant can grow, but only if the seed later meets the right conditions to wake up.
In this lesson you will pin down fertilisation in plants, follow the pollen tube on its journey down the style to the ovule, list the adaptations that make insect- and wind-pollinated flowers good at their jobs, and investigate exactly what a seed needs to germinate: water, oxygen and a suitable temperature.
Objectives
- State that fertilisation occurs when a pollen nucleus fuses with a nucleus in an ovule
- Describe the structural adaptations of insect-pollinated and wind-pollinated flowers
- Investigate and describe the environmental conditions that affect germination of seeds, limited to the requirement for: water, oxygen and a suitable temperature
- [Supplement] Describe the growth of the pollen tube and its entry into the ovule followed by fertilisation (details of production of endosperm and development are not required)
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Lesson Evaluation
Congratulations on completing the lesson on Sexual Reproduction In Plants (continued). 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.
- Fertilisation in a flowering plant occurs when: A. pollen lands on the stigma B. a pollen nucleus fuses with a nucleus in an ovule C. the pollen tube reaches the style D. a seed germinates Answer: B
- Through which structure does the pollen tube grow to reach the ovary? A. filament B. style C. sepal D. anther Answer: B
- Which three conditions are required for the germination of seeds? A. light, water and warmth B. water, oxygen and a suitable temperature C. carbon dioxide, water and light D. nitrogen, oxygen and warmth Answer: B
- Why is oxygen needed for germination? A. for photosynthesis B. for aerobic respiration to release energy C. to attract insects D. to denature enzymes Answer: B
- In a germination experiment, the variable that is changed in one tube while all others are kept the same is the: A. control variable B. independent variable C. dependent result D. constant Answer: B
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