Unit 9: Plants                                                                1   2   3   4   5   6

1. Characteristics of Plants

Organisms of Plant Kingdom are multicellular living beings, made up of eukaryotic plant cells and autotrophs (photosynthetic).

First terrestrial living beings were plants. They evolved from green algae, about 500 million years ago.

They have tissues and organs (leaves, roots, stems and flowers) but they do not have systems.

Most part of plants is adapted to live in land, attached to the ground. Although they can not displace, however they are able to make some movements. For example they grow towards the light, or close their flowers during the night.

Traditionally the Plant Kingdom is divided into two groups, according to the way they reproduce:

       - Non-seed plants. They are the simplest plants.They don't form flowers.

                  - Bryophytes (Mosses). They don’t have conductor vessels

                  (Non-vascular plants) and non-true organs.

                     - Pteridophytes (Ferns). They have conductor vessels

                  (Vascular plants) and true organs (leaves, root and stem)

         - Seed plants (Spermatophytes). They are the most complex plants.

          They form seeds.

                - Gymnosperms (Conifers). They are vascular

                   and they form seeds but not fruits.

                - Angiosperms (Flowering plants). They are vascular too

                   and they form seeds and fruits.

1. 1. Complete the sketch. Then, classify the following plants

         in their correspondant group.

1.2. Relate these two columns (put the correspondant letter in the point line)