Biology 9 Lesson 38: Practice: Practice cross-pollination
1. Theoretical Summary
Review the content of the lesson knowledge
2. Practice Procedure
a. Learn the manipulations of pollination
– Step 1: Choose the mother plant, keep only unbroken flowers and flowers, not deformed, not too young or old, other flowers are cut.
– Step 2: Eliminate male in the mother flower plant
- Cut the husk diagonally on the belly to reveal the stamens.
- Use tongs to pick up 6 stamens (including anthers) out.
- Cover the rice pad with the date, specifying the date.
– Step 3: Pollination
- Gently lift the uncut stamen and gently shake it on the destabilized rice.
- Plastic bag with date.
b. Report the harvest
– Present the operations of cross-pollination and perform operations on real samples.
– Attention should be paid during implementation:
+ Step 1: Keep only unbroken flowers and flowers, not deformed, not too young or old because at this time the pollen grains and ovules are ripe and can be fertilized, for high fertilization efficiency.
+ Step 2: Eliminate male in the mother flower plant to avoid the phenomenon of pollen of the mother plant falling on the stigma of the mother plant, the pollination process is unsuccessful.
+ Step 3: Pollination
- Gently lift the uncut stamen and gently shake it on the de-stamened rice because the pollen grain is light, so if not done carefully, the pollen can easily fly away without falling on the stigma.
- Date-stamped plastic bags to track the time from pollination to seed formation.
3. Report on practice results
The groups take turns to evaluate the performance report
First and last name ………….
After completing this lesson, you should:
- Describe the operations of cross-pollination in self-pollinating and cross-pollination plants.
- Grasp the skills of observing pictures, skills of group activities, exploiting picture channels, working with textbooks and practicing observation skills and practical skills.