Ch 24 Bio Acquista
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How do we benefit from plants?
- FOOD, OXYGEN, RAW MATERIALS (such as wood) and MEDICINES
- *a standard breast cancer chemo-treatment is Taxol...if interested, look up its source
How do farmers maximize the development and yield of corn, broccoli, cabbage, etc?
Which hormone stimulates cell elongation in the root and stem?
Which part of the plant releases ethylene gas?
Which plant hormone is a ‘growth hormone’ causing the plant to increase in size?
If a plant was laid horizontally what would happen?
- AUXINS IN THE LOWER SIDES OF THE STEM CAUSE CELL ELONGATION AND
- CAUSE THE STEM TO BEND UPRIGHT (90 degrees)
What is it called when a shoot bends towards the light?
How do you describe the growth of plant seedlings?
PHOTOTROPIC (Stems grow towards light.) & GRAVITROPIC (Roots grow downwards.)
What is it called when ivy tendrils wrap around a pole?
When a plant responds to changes in the day’s length/season what is it responding to?
Why do many leaves change color in the fall?
- THE PRODUCTION OF ANTHOCYANIN (a red pigment) INCREASES AND THE
- PRODUCTION OF CHLOROPHYLL (a green pigment) decreases
How is offspring made from a plant that reproduces vegetatively?
BY MITOSIS (CELL DIVISION) ALONE
How is vegetative reproduction a disadvantage?
- WHEN CONDITIONS IN THE PHYSICAL ENVIRONMENT SUDDENLY CHANGE
- (ex. a nuclear cloud descends)
Where is pollen produced (in angiosperms = flowering plants)?
What are 3 essential features of the female structure of a flower?
What forms when a pollen grain lands on the stigma of a flower?
A POLLEN TUBE down to the ovary
What is true about a flower pollinated with the help of animals such as bees?
- THEY ARE BRIGHTLY COLORED
- THEY PRODUCE NECTAR TO ATTRACT POLLINATORS
- THEY POLLINATE MORE EFFICIENTLY THAN WIND-POLLINATED PLANTS
What are fruits and seeds?
FRUITS ARE MATURED OVARIES THAT CONTAIN SEEDS (embryos)
What is the advantage of an embryonic plant being dispersed far from the parent plant?
THIS ELIMINATES COMPETITION WITH THE PARENT PLANT
When is a seed alive but not growing?
What is the advantage of a seed going dormant?
IT CAN SPROUT WHEN CONDITIONS ARE IDEAL
When does a plant embryo begin to grow?
How are seeds spread by wind and water characterized?
How are seeds that are dispersed by animals characterized?
BY FLESHY, NUTRITIOUS FRUITS (yum)
STUDY ACQUISTA POWER NOTES.
What would you like to do?
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