How do plants stay alive and produce offspring?

1. How do plants stay alive and produce offspring? Chapter 4

2. How plants make food • During photosynthesis, plants use carbon dioxide, water, and sunlight to energy to make sugars. • Oxygen and water are the waste products of photosynthesis. • Chloroplasts contain chlorophyll, which captures the energy of sunlight. • Roots, veins, and tubes transport water and other materials throughout the plant. • REMEMBER- plants make their own food through photosunthesisnot through their roots!!!

3. Parts of Plants • Plants are made up of cells and tissues. The tissues form organs of the plants. • Plant organs: leaves, stems, and roots. • The role of leaves is to produce food. • The stem supports the plant and transports materials between the roots and leaves. • Think of an elevator taking water up!

4. How do plants reproduce? • Flowering plants and conifers (cone-baring trees) reproduce by making seeds. • A flowering plant contains male (stamen) and female (pistil) reproductive parts. • The stamen produces sperm cells. The pistil produces egg cells. Stamen Pistil Women can be a pistol!

5. Parts of a flower • Most flower have 4 main parts: • Sepals • Petals • Stamens • At least 1 pistil • The petal is the colorful part of the flower. • Sepals- small green leaves below the petals. • As the flower blooms, the sepals are push

6. Parts of the flower • In a flowering plant, the stamen makes pollen and the pistil makes eggs. • Eggs responsible for plant reproduction. • All plants reproduce. • Plants pass information from one generation to the next through DNA. • In sexual reproduction, DNA from both parents is passed to offspring.

8. Parts of the Flower • Petals- most colorful tissues of a flower. • Animals are attracted to petals. • Not all showy petals- top of a corn plant and ears of corn are flowers!

9. Parts of the Flower • Stamen-male part of the flower. • Pollen- grainy, yellow powder is made at the top of the stamen. • Flowers may have many stamen. • Pistil-female part of the flower. • Bottle shaped • Wide bottom and narrow neck • Flowers may have more than one pistil.

10. Parts of the Flower • Not all flowers have stamens and pistils. • Flowers with only one of these are called imperfect flowers. • Examples- maple trees • Flowers with both parts are called perfect flowers.

11. Composite Flowers • Flowers that are made of hundreds of tiny flowers. • Passing Information: • Plants must reproduce before they die. • New plants look like parents. • Plants pass DNA from one generation to the next. • DNA contains all the information making flowers, leaves, and every part of the • Sexual reproduction- passing of DNA from 2 parents to offspring

12. Pollination • Wind, water, or living things may move pollen from the stamen to the pistil of a plant or plants. • Fertilization occurs when the sperm cell joins the egg cell in the pistil. • A fertilized egg cell grows into a seed with one whole set of DNA, half from each parent.

14. Pollination • The young plant will grow to look much like its parents, but could have differences because of the DNA the plant receives from each parent.