(i) | Majority of the pteridophytes are heterosporous |
(ii) | Selaginella and Salvinia are homosporous |
(iii) | The megaspore germinate to form male gametophyte |
(iv) | Pteridophytes may show seed formation in a few cases |
(v) | Selaginella is a type of fern |
(i) | The main plant body is the sporophyte. |
(ii) | The sporophyte is differentiated into true roots, stems, and leaves. |
(iii) | Their gametophyte lacks vascular bundle. |
(iv) | Microphylls are found in Selaginella and macrophytes in the ferns like Dryopteris. |
(v) | Strobili or cones are found in Selaginella and Equisetum. |
1. | Four | 2. | Five |
3. | Two | 4. | Three |
(i) | Mosses serve as food for birds and herbivores |
(ii) | Sphagnum, a liverwort, provide peat that have long been used as fuel |
(iii) | Sphagnum, because of their high capacity to hold water is used as packaging-material for trans-shipment of living plant materials |
(iv) | Mosses have a little role during ecological succession |
(v) | Mosses, as they form dense mat, prevent soil erosion |
(i) | Sporophyte is multicellular |
(ii) | Sporophyte is free living |
(iii) | The spores germinate to produce sporophyte |
(iv) | Some cells of sporophyte undergo reduction division to produce haploid spores |
(v) | Gametophyte is non-photosynthetic structure How many of the above statements are correct? |
(i) | Vegetative reproduction usually takes place by fragmentation in unicellular forms. |
(ii) | Zoospore formation is rare. |
(iii) | Sexual reproduction can be isogamous, anisogamous, or oogamous. |
(iv) | Asexual reproduction can occur by flagellated zoospores produced in zoosporangia. |
(v) | Chlamydomonas, Chara, Spirogyra, Volvox, and Ulothrix belong to green algae. |
Consider the following statements regarding brown algae:
I. The pigments are chl a, c and xanthophylls, fucoxanthin
II. Storage food is laminarin and mannitol
III. The cellulosic cell wall is covered with algin
IV. They have a centrally located vacuole
V. Their photosynthetic organs are called as fronds - leaf like structures
VI. They have pear shaped biflagellate zoospores
VII. They have two unequal laterally attached flagella.
The number of correct statements is
1. 5
2. 6
3. 7
4. 4
Identify the following statements as true (T) or false (F) and select the option accordingly
(A) | Members of Rhodophyceae asexually reproduce by motile spores |
(B) | Members of Phaeophyceae do not show isogamous type of sexual reproduction |
(C) | In some green algae, food is stored in the form of oil droplets |
(A) | (B) | (C) | |
1. | T | F | T |
2. | F | F | F |
3. | F | F | T |
4. | T | T | F |