1) Give the general charactors of gymmosperm
Answers
Explanation:
•They do not produce flowers.
•Seeds are not formed inside a fruit. ...
•They are found in colder regions where snowfall occurs.
•They develop needle-like leaves.
•They are perennial or woody, forming trees or bushes.
•They are not differentiated into ovary, style and stigma.
Answer:
Characteristic of Gymnosperms
1. Vessels are absent except order Gnetales (Gnetum, Ephedra, Welwitschia). Gnetales act as connecting link between gymnosperms and angiosperms
2. Companion cells are altogether absent.
3. Reproductive organs form cones or strobilus except female organs of Cycas.
4. Ovule is generally orthrotropous, unitegmic with three layers.
5. Endosperm is formed before fertilization and is always haploid.
6. Smallest archegonium of plant kingdom is present in this group.
7. Fertilization occurs by pollen tube (siphonogamy). Double fertilization is absent.
8. Pollination is anemophilous.
9. Polyembryony is the usual feature.
10. Wood is manoxylic (soft and loose) eg., Cycas or Pycnoxylic (Compact and hard) eg., Pinus
Explanation:
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