Pollen grain after Pollination in Reproduction in Plants – Class 7 Science Experiment

Chapter Name: Reproduction in Plants

Activity Name: Pollen grain after Pollination in Reproduction in Plants

Activity Description:

This experiment aims to observe the germination of pollen grains from a Hibiscus flower after pollination on two slides, one with water and sugar grains and the other with only water.

Required Items:

1. Microscope
2. Two glass slides
3. Water
4. Sugar grains
5. Pollen grains from a Hibiscus flower

Step by Step Procedure:

1. Take two glass slides and place them side by side.
2. Put 2-3 drops of water on each slide, covering the entire surface.
3. On one of the slides, add a few sugar grains to the water and gently mix until they dissolve.
4. Now, carefully place some pollen grains from a Hibiscus flower on both slides.
5. Ensure that the slides are kept in a safe and stable location for one hour to allow sufficient time for observation.

Experiment Observations:

1. After one hour, observe both slides under a microscope.

Precautions:

1. Handle the microscope and glass slides with care to avoid damage.
2. Make sure the Hibiscus pollen grains are fresh and viable for accurate results.
3. Avoid contamination between the two slides during the experiment.
4. Use clean water and slides to ensure the purity of the samples.

Lesson Learnt from Experiment:

The experiment will likely reveal that the pollen grains on the slide with water and sugar have germinated, while the ones on the slide with only water may not have. This difference in germination is because pollen grains require certain nutrients and energy sources to germinate and grow. The sugar in the water provides the necessary nutrients, aiding the germination process.

This observation demonstrates the importance of external factors in the pollination process and highlights the role of pollinators in transferring pollen to the stigma of a flower, where germination can occur, leading to successful reproduction in plants.