Short Class Notes On Gymnosperms

GYMNOSPERMS

- Medium sized trees and shrubs.

- Main plant body Sporophyte.

- In some members roots may have fungal association called Mycorrhiza.

- In some (Cycas) coralloid roots present having algal zone with N2-fixingsymbioticalgae.

Root – taproot and leaves of two types -  1)Foliage 2)Sporophylls.

- Microsporophyll bears sporangia where microspores are formed.

- Megasporophyll bearsovules.

- Compact arrangement of Sporophylls is calledConeand loose one iscalled Strobilus.

- Microspore i.e. pollens reaches to ovules.

- Pollen tubes help to transfer male gametes up to egg of archegonia present in female gametophyte of ovule.

- Zygote develops in an embryo inside seed

-e.g. Cycas, Pinus ,Cedrusetc.