Practical 2 - Floral Structures and Functions Flashcards
What does Rf stand for?
Retention Factor
How do you calculate Rf?
Distance pigment moved from origin / distance solvent moved from origin
How do you separate pigments?
Thin Layer Chromatography
What does TLC stand for?
Thin Layer Chromatography
What is an Anthocyanin pigment?
Water soluble vacuolar pigments that attract pollinators
What are flowers?
Reproductive sexual structures present in angiosperms. They are usually hermaphroditic
What does hermaphroditic mean?
Both male and female reproductive organs are present
How does sexual reproduction in plants begin?
Pollination
How does pollination occur?
Pollen is produced in the ANTHER. It is released and lands on the STIGMA where it grows a POLLEN TUBE into the OVARY. 2 sperm cells release into the OVULE.
What are the haploid gametophytes in angiosperms?
Pollen grain (male)
Embryo sac (female)
What does the seed germinate into?
A sporophyte
What is the function of the micropyle?
Allows water into the seed for germination
What is the androecium?
The male reproductive organs of the plant.
Stamen = filament + anther
What is the gynocium?
Female reproductive organs of the plant.
Carpel = ovary + style + stigma
What is a pistil?
Single carpel unit
What is the perianth?
Collective term for the petals and sepals
How did you cut narcissus carpels for observation?
Transversely
What kind of stigma would you expect to see in a wind pollinated plant?
Feathery and long stigma
What kind of petals would you expect to see in an animal pollinated plant?
Brightly coloured, large
If a plant has a sweet smell, what is the expected pollination syndrome?
Insect/animal pollinated
What produces flowers?
Sporophytes
What precedes fertilisation?
Pollination
What is meant by double fertilisation?
2 sperm cells are released. 1 enters the egg cell to form the zygote. The other fuses with the polar nuclei to form the endosperm.
