Q. No.Select the correct statement with respect to gemmae
a.
These are specialised reproductive structures in members of thallophytes and bryophytes
b.
These are green, unicellular & asexual buds
c.
These are formed in small receptacles located on thalli
d.
Single gemma forms two new individuals after germination
e.
These are chlorophyllous and multicellular structures
f.
They germinate and make monoecious thallus of Marchantia
1. a,d,e and f
2. b,c,d and f
3. c,d and e
4. b,c and f
3. c,d and e
4. b,c and f
Mark the incorrect statement (with respect to gymnosperms)
| 1. | Sequoia is one of the tallest tree species |
| 2. | Dimophihc roots, stem and leaves in pinus |
| 3. | Generally tap roots are present |
| 4. | Palmately compound leaves in Cycas |
Read the following statements carefully and mark the correct with respect to gymnosperms
| a. | Pollen grains are carried by air currents |
| b. | Pollen tube carries the male gametes to archegonia |
| c. | Ovules are exposed before fertilization but get covered after fertilization |
| d. | They produce same type of spores |
1. a, b & d
2. a & b
3. a & c
4. b & d
Members of red algae are mostly marine, occurring both at surface water and at great depths in oceans except for a few fresh water species. These algae usually
| 1. | Reproduce asexually by motile spores |
| 2. | Show oogamous reproduction by motile gametes |
| 3. | Lack of chlorophyll-a and fucoxanthin |
| 4. | Reproduce vegetatively by fragmentation |
In heterosporous members of the pteridophyta
| 1. | Development of embryo takes place within the female gametophyte |
| 2. | Zygote produces a multicellular and undifferentiated sporophyte |
| 3. | Gametophyte is monoecious |
| 4. | Spore germination is exosporic |
The leaves of gymnosperms
| 1. | Are not adapted to withstand extremes of temperature |
| 2. | May be simple or compound |
| 3. | Are needle shaped in all members |
| 4. | Lack transfusion tissue |
Ovules present on loose megasporophylls, unbranched stem and dicotyledonous condition are features related to
| 1. | Cycas | 2. | Pinus |
| 3. | Cedrus | 4. | Ephedra |
Stipe, hold fast and frond are the terms associated with
1 Gracilaria
2 Polysiphonia
3 Laminaria
4 Chara
Leaf like photosynthetic organ is associated with algal group
| 1. | Showing only oogamous reproduction |
| 2. | Having predominance of r-phycoerythrin |
| 3. | Where members may reach a height of 100 metres |
| 4. | Usually having grass-green colour |
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