Plants repro.

In this chapter, you will learn about: 

• Asexual reproduction

• Examples of plants that reproduce via organs of vegetative propagation

• Describe the process of vegetative propagation

• Sexual reproduction

• Parts of a flower

• Functions of parts

• Pollination

• Self pollination vs Cross-pollination

• Insect-pollinated flower vs wind-pollinated flower

• Growth of pollen tube and entry into ovule

• Fertilisation

• Formation of fruit and seed

Asexual reproduction: 

• Does not involve fusion of nuclei of gametes

• Depends on mitosis (nucleus divides, produces two daughter cells)

• Daughter cells are all identical; Referred to as a clone

• Examples: 

  • Spores (Ferns)

  • Vegetative propagation (Rosemary, potato)

  • Buds (Yeast)

Vegetative propagation

• Bud grows on stem and develops into new plant

• NP detaches from parent plant, starts to exist separately 

• Bud consists of of tiny, packed leaves on a short stem at region of active cell division at tip of shoot

• Special organs may develop, but a bud is required

• All buds contain a bit of stem

• Some organs of propagation store food; Are called perennating organs 

• Organs of propagation

  • Stem tuber

    • Swollen tip of horizontal underground stem

    • Perennating organs

  • Rhizome

    • Horizontally growing stem w/ food reserves

  • Bulb

    • Modified shoot