Question

8. Explain where meiosis takes place in the a. Mosses b. Ferns c. Angiosperms

9. Mosses and liverworts are non-vascular plants, while club mosses, ferns, and angiosperms are vascular plants. Define the term vascular. How does the presence of vascular tissue affect the height of the plant?

3. Non-vascular and vascular seedless plants are said to be homosporous. Using C-ferns as an example, explain how male and female gametophytes develop from spores that are genetically identical.

Answer 1

A. In mosses it takes place in tiny sporophyte stage of bryophyte which are attached to and dependent on much larger gametophyte stage.

B. In ferns it takes place in sporangia which are placed at the underside of fronds. Within the sporangia are spore producing cells called sporogenous cells.

C. In angiosperms it takes place at two places... In ovules and in anther....

9. Vascular means presence of vascular tissue like xylem and phloem which further help in conduction of water. Vascular tissue help in conduction of water so presence of vascular tissue is mandatory for long height of the plant. In angiosperms rate of transpiration also helps in conduction of water or in pulling of water.

3. It happens due to antheridiogen. GA signaling and other pheromonal effect.