9.3.3 Ib Biology Higher Level
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Rashi Bhatnagar + Daniel Ugsang IB Biology HL Year 2
9.3.3 Distinguish between pollination, fertilization and seed dispersal. •
•
Pollination o
The placement of pollen onto the stigma of a carpel (female reproductive organ in plants) by means of wind or by animal carriers
o
A prerequisite to fertilization
o
It is the first event to occur
o
The movement of pollen onto the stigma of a carpel by a carrier
o
The process which transfers the pollen grains, which contain the male gametes to the stigma
o
Enables fertilization and sexual reproduction
Fertilization o
It is the process that occurs after pollination
o
The union of haploid gametes to produce a diploid gamete
o
Happens within the ovary of the plant
•
This gamete is now the seed produced by the plant
Seed Dispersal o
The action of the seed moving from its place to origin to another site where it will grow
o
The movement or transport of seeds away from the parent plant
o
Plants are immobile, thus they depend on different dispersal vectors, including both abiotic and biotic
o
There are 5 main modes of dispersal
Wind •
dandelions
Water •
Rain
Rashi Bhatnagar + Daniel Ugsang IB Biology HL Year 2 •
Animals •
Bees
•
Butterflies
•
Eats fruit then poops it out
Gravity •
rivers
Seed falls to the ground
Ballistic •
Apple falls from tree and rolls away
9.3.3 Distinguish between pollination, fertilization and seed dispersal. •
•
Pollination o
The placement of pollen onto the stigma of a carpel (female reproductive organ in plants) by means of wind or by animal carriers
o
A prerequisite to fertilization
o
It is the first event to occur
o
The movement of pollen onto the stigma of a carpel by a carrier
o
The process which transfers the pollen grains, which contain the male gametes to the stigma
o
Enables fertilization and sexual reproduction
Fertilization o
It is the process that occurs after pollination
o
The union of haploid gametes to produce a diploid gamete
o
Happens within the ovary of the plant
•
This gamete is now the seed produced by the plant
Seed Dispersal o
The action of the seed moving from its place to origin to another site where it will grow
o
The movement or transport of seeds away from the parent plant
o
Plants are immobile, thus they depend on different dispersal vectors, including both abiotic and biotic
o
There are 5 main modes of dispersal
Wind •
dandelions
Water •
Rain
Rashi Bhatnagar + Daniel Ugsang IB Biology HL Year 2 •
Animals •
Bees
•
Butterflies
•
Eats fruit then poops it out
Gravity •
rivers
Seed falls to the ground
Ballistic •
Apple falls from tree and rolls away
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