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Regarding Gymnosperms: Match the following and choose the most appropriate option:

A. coralloid roots 1. Cedrus
B. mycorrhiza 2. Cycas
C. branched stem 3. Dryopteris
D. unbranched stem 4. Equisetum
E. pinnate leaves persist for a few years 5. Pinus
6. Pteris

( A ) A-2; B-5; C-2; D-1,5; E-2
( B ) A-3,4; B-5; C-2; D-1,6; E-2
( C ) A-4; B-5; C-1,5; D-2; E-2
( D ) A-2; B-5; C-1,5; D-2; E-2
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(D) is the right answer.

In gymnosperms : Roots in some genera have fungal association in the form of mycorrhiza (Pinus), while in some others (Cycas) small specialised roots called coralloid roots are associated with N2- fixing cyanobacteria. The stems are unbranched (Cycas) or branched (Pinus, Cedrus). The leaves may be simple or compound. In Cycas the pinnate leaves persist for a few years.
answered Apr 2, 2014 by pady_1
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