In: Biology
describe the process from flower , to fruit to seed
Compare and contrast gymnosperm with angiosperm
Development of fruit and seeds from flowers:
Adult plant produces flowers
When the plant matures and is ready to reproduce, it develops flowers. Flowers are special structures involved in sexual reproduction, which includes pollination and fertilisation.
Pollination
Pollination is the process by which pollen is carried (by wind or animals) from the male part of a flower (the anther) to the female part (the stigma) of another flower. The pollen then moves from the stigma to the female ovules.
Fertilisation
Pollen has male gametescontaining half the normal chromosomes for that plant. After pollination, these gametes move to the ovule, where they combine with female gametes, which contain half the quota of chromosomes for its plant. This process is called fertilisation.
Seeds and fruit
After fertilisation, a combined cell grows into an embryo within a seed formed by the ovule. Seeds are what a plant uses to spread new plants into new places. Each seed contains a tiny plant called an embryo, which has root, stem and leaf parts ready to grow into a new plant when conditions are right.
Another part of the flower (the ovary) grows to form fruit, which protects the seeds and helps them spread away from the parent plant to continue the cycle.
Comparision of Angiosperms and Gymnosperms :
Angiosperms | Gymnosperms |
---|---|
Definition | |
Seed-producing flowering plants whose seeds are enclosed within an ovary. | Seed-producing non-flowering plants whose seeds are unenclosed or “naked.” |
Seeds | |
Enclosed inside an ovary, usually in a fruit. | Bare, not enclosed; found on scales, leaves or as cones. |
Life Cycle | |
Seasonal (die during autumn/fall). | Evergreen |
Tissue | |
Triploid (endosperm produced during triple fusion) | Haploid (endosperm produced before fertilization) |
Reproductive system | |
Present in flowers; can be unisexual or bisexual | Cones; unisexual |
Leaves | |
Flat | scalelike , needle-like |
Cotyledons | |
Present; single (monocots) or in a pair (dicots) | Absent |
Wood | |
Hardwood | Softwood |
Periniality | |
Non-perinnial | Perinnial |
Kingdom | |
Plantae | Plantae |
Domain | |
Eukarya | Eukarya |
Reproduction | |
Mostly rely on animals. | Mostly rely on wind. |
Uses | |
Medications , food, clothing, etc... | Paper, Lumber , etc... |