For a long time, it seemed that the SC was necessary for Class I crossovers in plants, but studies of plants bearing mutations in transverse filament-encoding genes (ZEP1andZYP1in rice and Arabidopsis, respectively) have shown that this is not the case; in these mutants, the number of Cla...
Why do plants provide bees, butterflies, hummingbirds, and other animals with nectar?Pollination:Pollination occurs when pollen from the male part of a plant is transferred to the female part of the plant. This can occur when a flower pollinates itself, which is called self...
Why do all flowers produce pollen, but not all produce nectar? why does a beekeeper keep beehives in crop fields 2 answers below why does a beekeeper keep beehives in crop fields during the flowering period Why did some plants develop with red, purple, and brown leaves?
So that the leaves of the trees receiving the pollen will not prevent the pollen from reaching the trees’ stigmas C. Because they do not have enough energy to produce new leaves and pollen at the same time D. In order to take advantage of the windiest time of year ...
根据表格第二栏It does not smell sweet but like bad meat.Because it wants to draw in small insects to help them bring the pollen(花粉)to other places.(闻起来不甜,倒像是劣质肉。因为它想吸引小昆虫,帮助它们把花粉带到其他地方。)可知本段主要介绍了巨魔芋为什么这么难闻。故选A。(4)细节理解题。
Polluted air and steadily rising temperatures are linked to health effects ranging from increased heart attacks and strokes to the spread of infectious diseases and psychological trauma.
Laboratory studies indicate that caterpillars can die from eating Bt pollen. However, field tests indicate that Bt corn is not likely to harm monarchs. Furthermore, the application of pesticides (the alternative to growing Bt plants) has been demonstrated to cause widespread harm to nontarget ...
The insects are collecting nectar for themselves, but as they do so, pollen collects on their bodies and rubs off onto other flowers they land on. This fertilizes the flowers, the plant will grow seeds, and ultimately fruit from the seeds. Without pollination, plants that bear fruits,...
pollen in the air. For indoor cats, windows should only be opened during these times as well. After going outside, your cat’s feet, belly, and any other area that contacts the ground should be cleaned with a damp towel or baby wipe to remove some of the pollen attached to the hair...
Could the pollen get to the stigma on its own? Explain. How do plants contribute to moisture in the air? Explain the role of tapering in the formation of a pollen grain wall. What environmental factors might plants use to know when to open their flowers? Give reason why plants die...