8.3 Phylum Moniliophyta, Subphylum Sphenophyta: Horsetails 7. Examine the photo

Question

8.3 Phylum Moniliophyta, Subphylum Sphenophyta: Horsetails 7. Examine the photo on the right. You studied this genus in lab, but this is a different species. This species has two separate stems produced at different times in the growing, season. The stem on the left is a reproductive branch, while that on the right is strictly vegetative. Based on the characteristics obvious in this photo, identify the plant, give its scientific name, and then identify the labeled structures. Scientific name 8. Explain the distinction between a node and an internode. (0.75X) nnnnnn 0 0 0 0 0 0 0 0 0 0 0 0 O O OOOOoooo 8.4 Phylum Moniliophyta, Subphylum Pterophyta: Ferns 9. While rock climbing, you encounter the plant shown in the photo on the right growing out of a crevice. (a) Is this the sporophyte or the gametophyte? (b) What special name is given to the leaf of this plant? Kisy MT Aq 10. The environments in which ferns grow range from standing water to very dry areas. Nonetheless, all ferns are dependent upon free water in order to complete their life cycles. Explain why this is the case. (0.5% 136

Explanation / Answer

Question 7 :

Scientific name : Equisetum

A. Strobilus

B. Node

C. Internode

Question 8 : Node bears scale leaves arranged in whorl and it also give rise lateral branches.

Internode are long,hollow and ribbed due to presence of longitudinal ridges and furrows.

Question 9 :

A. This is sporophytic plant body of a fern. It is dominant stage in fern.

B. The leaves of fern are called fronds. Thes are large size(megaphyllous).

Question 10 : Because Fertilisation occurs in the presence of water. It is needed for dehiscemce of antheridia, liberation of antherozoid, movement of antherozoid to archegonia etc.

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