Pollen, a powdery substance, which is produced by flowering plants and contains male reproductive cells, is usually carried from plant to plant by insects or birds, but some plants rely on the wind to carry their pollen. Wind pollination is often seen as being primitive and wasteful in costly...
【题目】Wind pollination Pollen, a powdery substance, which is produced y flowering plants and contains male reproductive cel ls, is usually carried from plant to plant by insects r birds, but some plants rely on the wind carry th eir pollen. pollination is often seen as being pri mitive ...
[#insert4] Evergreen conifers, which do not shed their leaves, have less to gain from spring flowering, and, indeed, some flower in the autumn or winter. [#paragraph4]Pollen produced higher in the top branches is likely to go farther: it is windier (and gustier) and the pollen can...
[#insert4] Evergreen conifers, which do not shed their leaves, have less to gain from spring flowering, and, indeed, some flower in the autumn or winter. [#paragraph4]Pollen produced higher in the top branches is likely to go farther: it is windier (and gustier) and the pollen can...
Evergreen conifers, which do not shed their leaves, have less to gain from spring flowering, and, indeed, some flower in the autumn or winter.Pollen produced higher in the top branches is likely to go farther: it is windier (and gustier) and the pollen can be blown farther before hitt...
Bees are a big part of the life cycle of plants, carrying pollen from one flower to another and allowing plants to produce their frequently yummy output. But with bee populations on the decline, what can take their place? How about soap bubbles(肥皂泡)? It may sound fantastical. But Eijir...
The functional gender of an individual within a population is dependent upon three factors: (a) relative resource allocation to male and female reproduction (pollen grains/seed weight). (b) probability that pollen produced takes part in. fertilisation of successful zygotes. (c) probability that ...
Pollen can be carried by wind, rafted by water, or shuttled around by any manner of creatures (be they bees, beetles, birds, or bats) and deposited on the female reproductive part of another flower. That might sound pretty hit or miss, and it is, which is why plants produce lots of...
Thus the correlation between the pollen–ovule ratio and pollen size is spurious. Conclusions: Considering male function, the pollen–ovule ratio depends on the number of pollen grains produced by a flower but not on the size of the pollen grains. For the 'male part' of Charnov's model, ...
[59] found that male flowering shows synchronized annual fluctuations among stands at a regional scale; however, stand-specific catkin number during the masting year varies considerably, which in turn might also influence the pollen produced. This is also in accordance with our findings since the ...