Question

what are characteristics features of gymnosperms

Answer 1

1. THEY DO NOT HAVE A OUTER COVER ON THEIR SEEDS.
2. THEY DO NOT PRODUCE FLOWERS.
3. THEY DO NOT PRODUCE FRUITS.
4. THEY ARE POLLINATED BY WIND.

Answer 2

Answer:

General characteristics of Gymnosperms

1. Most plants are perennial and woody.

2. They are xerophytic, with sunken stomata and thick cuticle.

3. The xylem is without vessels and phloem lacks companion cells.

4. Reproductive organs are usually in the form of cones or strobili. The male cones are made up of microsporophyll's and female cones are made up of megasporophylls.

5. Microsporophyll's bear microsporangia.

6. Large number of microspores (pollen grains), are produced in microsporangia after reduction division, which later form male gametophytes.

7. Male gametophytes of all gymnosperms produce pollen tubes.

8. In the nucellus of megasporangia (ovules) one of the cells forms megaspore mother cell which after reduction division forms a linear tetrad of megaspores of which only one is functional.

9. Functional megaspore forms female gametophyte (also called endosperm). Thus the endosperm is a pre-fertilization tissue in gymnosperms).

10. On the micropylar end of female gametophyte are differentiated two or more archegonia.

11. All gymnosperms are wind pollinated.

12. Usually polyembryony is found in seed although ultimately only one embryo survives.

13. Archegonia lack neck canal cells.

14. Embryo bears two as in Cycas or more (10-11 in Pinus) cotyledons.

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