You are in free guest mode.
Timed Practice
Revision List
Attempt History
Progress Tracking
Create a free account to unlock these tools
Practice Reading: Fill in The Blanks (Drag & Drop)
ID: #34214
Bees
* Drag the correct answer into all target fields
A flower's colour, isn't a full-proof guide to a good lunch. That's because the colour can change depending on the angle at which hits its petals. A yellow flower, for example, may look somewhat blue from one angle and red from another. Scientists call this kind of colour change iridescence. 'It's the same phenomenon that makes a rainbow appear in a soap bubble or on a CD,' says Beverley Glover. She studies plants at the University of Cambridge in England.
In 2009, Glover and her colleagues showed that even when petals look shimmery, bees can still tell which flowers likely hold food. But she and others noticed something odd about iridescence. It's not quite as flashy in plants as in other life , Glover says. The backs of jewel, beetles, or the wings of certain butterflies, for instance, shine and shimmer a lot more.
The researchers their hypothesis in the lab. They trained a group of bees to associate fake purple flowers with getting more nectar. Then the team the bees. They added non-shimmery fake flowers with purple-blue and purple-red hues to the bees' flight path. The bees passed the test, ignoring flowers that weren't perfectly purple.
The second group of bees was trained to drink from fully flashy, 'perfectly iridescent' purple flowers. But when the team perfectly iridescent flowers in different hues, the insects checked them for nectar, too.
The third group of bees, , had no problem finding the right flowers when the petals had only a little bit of bling. These bees were trained to drink from ' imperfectly iridescent' purple flowers. When the team imperfectly iridescent flowers in different hues, the bees weren't confused at all. 'They could still clearly identify the purple flowers as the good ones,' Glover says. That means imperfect iridescence is for bees.
In 2009, Glover and her colleagues showed that even when petals look shimmery, bees can still tell which flowers likely hold food. But she and others noticed something odd about iridescence. It's not quite as flashy in plants as in other life , Glover says. The backs of jewel, beetles, or the wings of certain butterflies, for instance, shine and shimmer a lot more.
The researchers their hypothesis in the lab. They trained a group of bees to associate fake purple flowers with getting more nectar. Then the team the bees. They added non-shimmery fake flowers with purple-blue and purple-red hues to the bees' flight path. The bees passed the test, ignoring flowers that weren't perfectly purple.
The second group of bees was trained to drink from fully flashy, 'perfectly iridescent' purple flowers. But when the team perfectly iridescent flowers in different hues, the insects checked them for nectar, too.
The third group of bees, , had no problem finding the right flowers when the petals had only a little bit of bling. These bees were trained to drink from ' imperfectly iridescent' purple flowers. When the team imperfectly iridescent flowers in different hues, the bees weren't confused at all. 'They could still clearly identify the purple flowers as the good ones,' Glover says. That means imperfect iridescence is for bees.
worst
made
added
forms
however
tested
sunlight
best
Result:
With a free account:
Retry and compare every attempt.
How difficult was this question?
Others found:
100% Easy · 0% Medium · 0% Hard
Saving...