Chapter 1 Lesson 3

How are flowers pollinated?

Insects gather nectar from flower to flower. As the insects gather nectar, pollen (from the stamen) sticks to their bodies. As they move from flower to flower, they may brush against the pistils. The pollen on their bodies can stick to the pistils.

embryo

tiny part of a seed that can grow into a new plant

How seeds form

1. After fertilization, the flower dries up and the petals fall off, leaving just the pistil and its ovary 2. The top of the pistil falls off and the ovary gets larger as one or more seeds form inside it. 3. When the sees are formed, the ovary dries up and the seeds fall out

How is a monocot seed different from a dicot seed?

A monocot seed is a seed that has one seed leaf and stored food outside the seed leaf. A dicot seed is a seed that has two seed leaves that contain stored food.

Fruits

Apples, tomatoes, and grapes have a large amount of water. Other fruit such as shells of nuts, are dry.

Many of the food you eat are seeds

Corn, peas, and beans are seeds

Seeds

Each seed is covered by a seed coat that protects the seed.

How pollination occurs?

Pollen form the flower sticks to the body of a butterfly. the butterfly carries the pollen to the sticky pistil of the flower. Each pollen grain grows a thin tube form the tip of the pistil to its thick bottom or ovary. Each ovule contains an egg. The sperm for a pollen grain moves through the pollen tube to the ovary. When the sperm reaches an ovule, it combines with an egg. This combining of a sperm and an egg to make seeds is fertilization.

Flowering plants

Some flowering plants are monocots and some are dicots.

How does pollination occurs?

The butterfly carries pollen from the stamen of one flower to the pistil of the same flower. Sometimes the butterfly may carry pollen from the stamen of one flower to the pistil of another flower of the same kind.

Seeds

The ovary that surrounds the seed or seeds grows larger and forms the fruit.

Many ovules grow inside the ovary of a flower.

The wall of the ovary is thick. This wall protects the eggs inside the ovules while they are growing into seeds. As seeds grow larger, the ovary grows too.

Bees and Butterflies

These insects gather nectar from flower to flower. Insects use the liquid for food. As the insects gather nectar, pollen sticks to their bodies. As they move from flower to flower, they may brush against the pistils. The pollen on their bodies can stick to the pistils.

Bats and birds

They can also pollinate flowers. The colors and smells of flowers attract the animals.

How fertilization occurs

When a pollen grain reaches a pistil, it grows a thin tube to the ovary. Sperm from the pollen grain combines with an egg, and a seeds forms.

Monocot seed

does not split in half. It has one seed leaf. It has stored food around the seed lead. The corn, wheat and oat seeds are monocot seeds

What helps pollination?

Wind helps to pollinate grasses, trees, and flowers. Small animals such as insects, pollinate the flowers on apple trees

monocot seed

a seed that has one seed leaf and stored food outside the seed leaf

dicot seed

a seed that has two seed leaves that contain stored food

dicot seeds

can spilt into halves. It has two seed leaves. Each of the seed leaves has stored food. Beans, Peas, and maple seeds are dicots.

ovary

the bottom part of the pistil in which seeds form

fertilization

the combination of sperm from a pollen grain with an egg to form a seed

ovule

the inner part of an ovary that contains an egg

Pollination

the movement of pollen from a stamen to a pistil