Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following pairs are correctly matched? (1) Fertile spike ? Ophioglossum (2) Sporangiobphore ? Equisetum (3) Synangium ? Psilotum (4) Apophysis ? SpirogyraA) 1,2 and 3 are correct.
B) 1 and 2 are correct.
C) 2 and 4 are correct.
D) 1 and 3 are correct.
Correct Answer: A
Solution :
Ophioglossum reproduces by means of spores, which are formed within sporangia. The latter are borne on a fertile segment, which projects from the leaf near the junction of the petiole and lamina. This sporangiferous fertile segment is known as fertile spike. Equisetum is a homosporous pteridophyte. The spores develop within sporangia borne on sporangiophores, which are aggregated into a compact cone or strobillus. Psilotum reproduces by means of spores produced in sporangia borne at the distal end of the dichotomously branched aerial shoot. Sporangium is a trilobed structure in which each lobe has a spore sac with numerous spores. Such a sporangium formed by a group of two or more spore sacs is called synangium.
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