Engineering Hand Pollinators

In the third lesson, students apply what they have learned about plants, animals, and pollination to design a hand pollinator that mimics the body structures of a pollinator to move pollen from one flower to another. 

• Many plants depend on pollination, which means they depend on the animals that pollinate the plants.  
• Engineers can use what they know about the relationship between plants and their pollinators to design technologies that mimic the structures of those pollinators.
  
  

• Why is it important that plants make seeds?
• What would happen to a plant if all of the pollinators suddenly disappeared?
• How does a bee’s body make it such a good pollinator?
• What does the bee have to do for pollen to stick to it?
• How are the body parts of a hummingbird, another pollinator, different from those of a bee?
• What do the examples of the bee and the hummingbird show about the relationship between a pollinator’s body parts and its ability to collect pollen?
• What kinds of things would an engineer who wants to design a technology that copies how a pollinator collects and carries pollen from plant to plant want to think about?

Abdomen: the back segment of an insect where the stomach is

Antennae: body parts of insects that are used to smell, touch, and taste things

Larva : an insect’s young, worm-like form; a caterpillar for butterflies and moths

Pupa: the inactive stage of an insect when it changes; does not eat

Head: the front segment of an insect where the antennae, mouthparts, and eyes are found

Life cycle: the stages an organism passes through on its way from birth to death

Metamorphosis – when a living thing completely changes its form from one stage to the next in its life cycle

Thorax: the middle segment of an insect where the legs and wings are found

Pollinating Plants 

Many people raise bees. Bees are important for people. Bees make honey that people eat.

People also use bees to pollinate plants. Bees are good pollinators. They pollinate many plants. Bees pollinate many kinds of fruits and vegetables that people eat.

Many plants cannot make new plants without pollinators. Flowers use pollen to make seeds. The pollinators move the pollen to where it needs to go.

Pollinators move pollen from the stamens of one flower to the pistil of another. When the pollen reaches the pistil, new seeds can be made.

Collecting Pollen

Bees have body parts that collect pollen.Bees have fuzzy bodies. They are covered with many small hairs. Pollen sticks to these hairs when bees eat nectar. Some bees have a basket on their back legs. This basket holds pollen.

Insects aren’t the only pollinators. Some birds are also pollinators. Hummingbirds are pollinators. They have long, thin beaks. They reach their beaks into the flowers.

Some pollen from the flower gets on their face. They fly to another plant. Some of the pollen drops off onto this plant. It can now form seeds.

 

In this lesson, students summarize a problem presented in an engineering scenario, which is that insects are not pollinating the flowers in Kia’s garden. Students then identify criteria and constraints before designing their own prototype solution. Once students build their hand pollinator prototype, they test it to determine how well it solved the problem. Students collect and analyze data on how many pollen grains they could pick up with each of their prototype solutions, looking for evidence in their data about which prototype best solved the problem. Student teams present to the class their explanation about whether they would refine or replicate their prototype design. Different teams engage in scientific argumentation about which features best solved the problem, as well as any challenges they encountered.