Algae

1. The Zygotic meiosis and Gametic meiosis is seen in — Chlamydomonas (R/-palmella stage, ) also in Volvox (R/-gonidia – asex ep, pleka stage - 8 celled, anisogamous ) and Sargassum respectively.

2. The Heterotrichous algae are Ectocarpus, Cladophora, Polysiphonia.

3. The Stellate shaped chloroplast is seen in Zygnema. while Reticulate shaped in Oedogonium.

4. The minimum chromosome number in algae - n = 2 in Porphyra linearis while n = 592 maximum is in Netrium digitalis.

5. The reserve food material in algae belonging to

(1) Rhodophyceae — Floredean starch and galactan SO4 polymer.

(2) Phaeophyceae — Laminarin & Mannitol Oil.

(3) Chlorophyceae — Starch & oil.

6. Monospores — is the juvenile stage of Batrachospermum.

Autospores — are thin walled and non motile spores commonly formed in

Chlorella & Scenedesmus and these spores resemble the parent cell.

7. The simplest type of Oogamy is seen in Chlamydomonas coccifera and highest degree of Oogamy is seen in Chara. (R/-stonewart, body rhizoids with oblique septa, amylum stars, bulbils, globule- 8 shiel cells, spirally coil anthrozoid; nucule- 5 tube cells, zygote by r/d form sec protonema )

8. The Algae which is a common nitrogen fixer in rice field is — Aulosira fertilissima.

9. The algae which are grown in oxidation ponds for sewage disposal are — Chlamydomonas. Scenedesmus. Chlorella. etc.

10. Kieselgurh or diatomite — are the fossil deposits of unicelled algae — Diatom due to highly siliceous cell wail. (R/- Pennales-bilateral, Centrales- redial sym; epitheca & hypotheca, cell div. both valve act as epitheca in daughter cells, Sex rep. by Auxospore. Eg. Navicula, Fragilaria.

11. The parasitic Red algae which causes the disease Red Rust of Tea — Ceohaleuros virescens.

12. A single thylakoid per granum is found in the chloroplast of — Rhodophyceae.

13. The first division of the zygote is reduction division in — Algae.

14. Î -carotene occurs — Diatoms.

15. Cap cells. Meiozoospore, Dwarf males & Suffultory cells are seen in the Oeodogonium. (R/-spp. Macran -mono & dio,; Nanan.a-gynan- andro & oogonia developon same filament, b-Idioandro )

16. The epiphytic species of Cladophora which shows Aegagrophilous habit(R/-filaments form ball like stru. ) —Cladophora holsatica & c. profunda.

17. The number of manubrial cells in the globule of Chara — is eight. (8).

18. The algae which have aseptate, muitinucleate coenocytic. exhibiting siphonous habit and discoid chloroplast pyrenoid absent — Vaucheria.

19. Gongrosira state is the characteristic of — Vaucheria. (R/-Synzoospore,

20. Clump formation. Trichothallic growth of erect branches, Band shaped chloroplast, heterotrichous habit is seen in — Ectocarpus.

21. The frog spawn alga, characteristic pit connection and filament is beaded showing uniaxial construction Cystocarp and Glomerule, Monospores is characteristic of — Batrachospermum.

22. Chantransia stage & Gonimoblast initials is characteristic of — Batrachospermum.

23. Hormogonia — is vegetative mode of reproduction in Blue green algae.

 

 

NOTE

• Hydrodictiyon – show polyhedron, isogamy, net cenobium
• Ulva – quadriflagelllated zoospore, sea lettuce or green laver , isomorph. A. g.
• Chetophorales.- fritchiella – MOP iyenger, Coleochaete – setae or haires, carpogonia – spermocarp- post ferti stage
• Zygnema-stellate ch.; 1 pyrenoids/ ch. Parthenospore. Ameboid gamit conjugation,
• Desmids – Cosmarium- placoderm semi cells. Constricton k/a sinus & isthmus