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5. Reproduction in plants. - Coggle Diagram
5. Reproduction in plants.
Types:
Sexual reproduction
2 reproductive organs (male and female).
Each organ produces one type of sex cell, or
gamete
.
Descendents hace characteristics similar to both progenitors.
Asexual reproduction
Single progenitor.
New individuals are genetically identical to progenitor.
Asexual reproduction: vegetative propagation
Introduction
One of the techniques used in agriculture and gardening.
Most common form of asexual reproduction in plants occur when new individuals are created from one of the parts, usually from stem buds.
Types
Tubers
Each stem can become a new plant.
Potatoes, sweet potatoes and cassava.
Underground stems that hold nutrients.
Bulbs
Onions, garlic and tulips.
Underground stems with thick leaves that store nutrients.
Stolons
They can grow roots and form new plants.
Strawberry plants and mint.
Thin stems that grow parallel to the ground.
Rhizomes
Able to form a new plant.
Grasses, rushes and trees like poplars and oaks.
Underground stems.
Reproduction in plants without seeds
Male and female gametes join together in plants without seeds and develop into a structure that produces
spores
.
Reproduction of mosses and liverworts:
Spores mature, the capsules open and the spores are blown around by the wind.
In favourable conditions, spores germinate and develop into new plants.
Spores inside
capsules
located at the end of their cauloid stems.
Reproduction of ferns:
Inside the sori are the
sporangia
(spore-producing structure).
Spores mature and the sporangium opens to allow spores to be sent out into the air.
Spores are produced inside the brown spots called
sori
, located on the underside of the fronds.
