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BIO100 > Topic 6b - Plant repro. & dev. > Flashcards

Topic 6b - Plant repro. & dev. Flashcards

1
Q

Re. alternation of generations…diploid mother cells develop from which structures? (male/female)?

A

Anthers (male)

Ovaries (female)

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2
Q

Re. alternation of generations…meiosis of mother cells in sporophyte produces…?

A

haploid spores

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3
Q

Re. alternation of generations…male (pollen) & female gametophytes produce…?

A

sperm & eggs

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4
Q

Go thru slide 5…

A

kill me now!

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5
Q

What structures make up the stamen?

A

anther & filament

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6
Q

What structures make up the carpel?

A

stigma, style, ovary

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7
Q

1st step in fertilisation of flower…When does pollination occur?

A

when pollen grain lands on the stigma of a carpel…see slide 13

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8
Q

2nd step in fertilisation of flower…What happens after pollination occurs?

A

pollen tube grows down thru style of carpel, tube cell nucleus & sperm follow…see slide 13

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9
Q

3rd step in fertilisation of flower…Double fertilisation…

A

pollen tube & sperm reach female gametophyte - one sperm fuses with central cell, the other sperm fuses with egg cell…see slide 13

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10
Q

Fruit develops from the …?

A

ovary

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11
Q

Seeds develop from the …?

A

ovule

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12
Q

What are the 6 major groups of plant hormones?

A 
auxins
gibberellins
cytokinins
ethylene
absidic acid
florigens
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13
Q

Charateristics of auxins…

A

promotes cell elongation in shoots
inhibits cell elongation in roots
stim. fruit dev.

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14
Q

Charateristics of gibberellins…

A

promotes stem elongation

stimulates - bud sprouting, flowering, fruit prod., seed germination…

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15
Q

Charateristics of cytokinins…

A

promote cell division
inhibits lateral root branch formation
stimulates lateral shoot branch formation
nutrient transport -> leaves

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16
Q

Charateristics of ethylene…

A

in most plant tissue
stress hormone
ripening of fruit

17
Q

Charateristics of absidic acid…

A

throughout plant

helps with adaptive responses

18
Q

Charateristics of florigens…

A

timing of flowering

identified in 2005

19
Q

Which 2 plant hormones work together?

A

auxins & cytokinins

20
Q

What is photoperiodism? What agent is responsible? 3 types…

A 
changes in flowering of a plant in response to changes in day length
agent - phytochrome (2 forms)
- no change
- long-day
- short-day
21
Q

What is the important variable in photoperiodism?

A

duration of uninterrupted darkness (not day length per se)

22
Q

2 forms of phytochrome?

A

Pr - absorbs light in red wavelengths

Pfr - absorbs light in far red wavelengths

23
Q

Phytochrome control of flowering in short day (long night) plants?

A

Pfr (inhibits flowering) gets converted -> Pr thus low Pfr -> removal of inhibition of flowering -> initiation of flowering

BIO100 (25 decks)

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