In plants, which cell is produced that grows into the gametophyte? Where is the plant embryo found? What is the difference between sexual reproduction and vegetative propagation? Where does fertilization occur in the human reproductive system? In a flowering plant, the megaspore undergoes mitosis an...
Bulb – a rounded part of some plants that is under the ground and that grows into a new plant during the growing season. Grain – the seeds of plants (such as wheat, corn, and rice) that are used for food. Pollen – the very fine usually yellow dust that is produced by a plant ...
But more than ever, birds are threatened byhuman pollution and cpmate change.We need the birds to eat insects, move seeds and pollen around, transfer nutrients from sea toland, clean up after the mass death of the annual Pacific salmon runs, or when a wild animal fallsanywhere in a field...
阅读理解。 An allergy (过敏反应) is a strong reaction to a substance. Many things can cause allergies. The most common cause is pollen (花粉) which is usually produced by trees in the spring grasses in the summer and weeds in the fall as part of their reproductive process. Other causes...
some snakes, fish, and monitor lizards. The phenomenon is rarer among plants (where it is called parthenocarpy) than among animals. Unusual patterns of heredity can occur in parthenogenetic organisms. For example, offspring produced by some types are identical in all inherited respects to the ...
38 Valencia is in the eastpartof Spain. It has a port on the sea, two miles away from the coast. It is the capital of a province that is also named Valencia. The city is a market center for what is produced by the land around the city. Most of the city's money is made from ...
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 Eijiro Miyako...
The gatekeeper who declares, "The Wizard will see you now," at the end of "One Short Day" is Stephen Schwartz, who composed the music and wrote the lyrics to the musical. Goofs In the classroom scene where Elphaba causes the flowers to rise in the air and the pollen sends the students...
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 Eij...
What is an aster's main function in cell division? Tell what part of a carpel is involved in (1) germination, (2) growth, and (3) function of a pollen tube? What part(s) of mitosis is(are) haploid? What is the central portion of the chromosome to which the spindle fibers attach...