Question

Explain the characteristic feature of the sporangiferous spike of lycopodium with suitable sketches? how does it differ from that of a synengiun?​

Answer 1

Answer:

1.Plant body is sporophytic and the sporophyte is divisible into roots, stem and leaves.

2. The genus is divisible into two subgenera. In sub-genus Urostachya, the plant body is erect or pendant, rarely branched, with rarely organized strobili, and the sporophylls are entire and their length is similar with the foli1.age leave.

Lycopodium. External features of some species

Lycopodium. External features of some speciesBut in sub-genus Rhopalostachya, the plant body is creeping or trailing, well-branched showing dichotomy, with well-organized strobili, and the sporophylls with toothed margins and their length is quite dissimilar with the foliage leaves.

3. Roots are adventitious, dichotomously branched and small.

3. Roots are adventitious, dichotomously branched and small.4. Stem is erect or pendant in sub-genus Urostachya, while it is prostrate with upright branches in sub­genus Rhopalostachya.

5. The branching of the stem is partly monopodial and partly dichotomous.

5. The branching of the stem is partly monopodial and partly dichotomous.6. The stem is thickly covered with many leaves.

5. The branching of the stem is partly monopodial and partly dichotomous.6. The stem is thickly covered with many leaves.7. Leaves are eligulate, simple, small, sessile, usually lanceolate in outline with broad base. Each leaf contains a single unbranched midvein .

Answer 2

The characteristic feature of the sporangiferous spike of lycopodium is

1- the plant body is sporophyte and root stem and leaves are the divisible part of sporophyte

2- root is dicotonomously branched. And of the adventitious type

3- stem is flat and erect. And stem is of both dichotomous and monopodial.

4- leaves are present over the stem like a thick sheet.

5- plant is well branched ,tall and creeping with proper strobilus.

6-leaves are simple sessile and with the broad base. Each leaf consist of unbranched midveins.