Plant Kingdom · Question 80

In gymnosperms, the pollen chamber represents

1. a cavity in the ovule in which pollen grains are stored after pollination
2. an opening in the megagametophyte through which the pollen tube approaches the egg
3. the microsporangium in which pollen grains develop
4. a cell in the pollen grain in which the sperms are formed

Spore dissemination in some liverworts is aided by

1. indusium
2. calyptra
3. peristome teeth
4. elaters

Flagellated male gametes are present in all the three of which one of the following sets?

1. Zygnema, Saprolegnia and Hydrilla
2. Fucus, Marsilea and Calotropis
3. Riccia, Dryopteris and Cycas
4. Anthoceros, Funaria and Spirogyra

If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?

1. Nature of stored food materials in the cell
2. Structural organization of thallus
3. Chemical composition of the cell wall
4. Types of pigments present in the cell

In the prothallus of a vascular cryptogam, the antherozoids and eggs mature at different times. As a result

1. there is high degree of sterility
2. one can conclude that the plant is apomictic
3. self fertilization is prevented
4. there is no change in success rate of fertilization

Peat moss is used as a packing material for sending flowers and live plants to distant places because

1. it serves as a disinfectant
2. it is easily available
3. it is hygroscopic
4. it reduces transpiration

Conifers differ from grasses in the

1. formation of endosperm before fertilization
2. production of seeds from ovules
3. lack of xylem tracheids
4. absence of pollen tubes

In a moss, the sporophyte

1. manufactures food for itself, as well as for the gametophyte
2. is partially parasitic on the gametophyte
3. produces gametes that give rise to the gametophyte
4. arises from a spore produced from the gametophyte

Ectophloic siphonostele is found in

1. Osmunda and Equisetum
2. Marsilea and Botrychium
3. Adiantum and Cucurbitaceae
4. Dicksonia and Maiden hair fern.

Top-shaped multiciliate male gametes and the mature seed which bears only one embryo with two cotyledons, are characterised features of

1. cycads
2. conifers
3. polypetalous angiosperms
4. gamopetalous angiosperms