Question

Angiosperms

- Main characteristics of Angiosperms

- Which life stage is dominant: gametophyte or sporophyte?

- Relevance of Angiosperms

- Main characteristics of Monocots and Dicots

Answer 1

Main characteristics of angiosperms are:

1. Angiosperms are called as flowering plants.

2. Have seed enclosed within an ovary.

3. They are vascular plants.

4. Sporophytes are differentiated into root, stem and leaves.

5. Produced two types of spores. First is microspores and second is megaspores.

6. Pollination by insect.

7. Double fertilization is present.

8. Endosperm is triploid and develop after fertilization.

Sporophyte is dominant and differentiated into root, stem and leaves.

Angiosperms are good source of timber in the tropics, used as food, mainly as a grain, sugar, vegetables and fruits.

Monocot characteristics are

1. Pollen with single pore

2. Parts of flowers in multiples of three

3. Leaf veins parallel.

4. Stem vascular bindles scattered.

5. Seed have one cotyledons.

6. Vascular cambium is absent.

Dicot characteristics are

1. Pollen with three pores

2. Parts of flowers in multiples of four or five

3. Leaf veins reticulated

4. Stem vascular bindles arranged in ring

5. Seed have two cotyledons.

6. Vascular cambium is present