Which parts of the life cycle of a fern are haploid? Which are diploid? How many

Question

Which parts of the life cycle of a fern are haploid? Which are diploid? How many veins are present in each frond? What tissues comprise a vein of vascular tissue? What is the function of the stalk? The blade? The pinnae? How is the mechanism for spore dispersal in ferns similar to that of bryophytes? Is the prothallium haploid or diploid? Is the prothallium sporophyte or gametophyte? What is the adaptive significance of having these structures on the lower surface of the prothallium rather than on the upper surface? What is the adaptive significance of having sperm and egg produced at different times?

Explanation / Answer

Ans. 1(a) the gametophyte or prothallus is haploid in fern lifecycle.

Ans. 1(b the sporophyte is diploid.

Ans. 2 there are around 40 veins in each frond.

Ans.2b. external xylem and internal phloem comprise the vascular bundle.

Ans.2c. stalk connects the leaf to the branch. Pinna and lamina constitute the main leaf body.

Ans.3a. Prothallus is haploid.

Ans. 3b. Prothallium is gametophyte

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