I did this experiment in biology and I'm not sure about these questions. Any help would be appreciated and if you get the information off the web I'd also LOVE if you would state the site, thank you!
1) Why are bean plants white when they grow in the dark?
I know it is lack of cloriohile but im not sure on details......
2)Why are the bean plants growing in the dark taller than the ones in the window?
If your just going to tell me to do my own homework I'd like to tell you that I tried but couldnt find anything.
2006-09-22 10:33:07 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Try searching for "Etiolation" on the web. I think you will find the answer to both questions....
2006-09-22 10:37:18 · answer #1 · answered by Anonymous · 0⤊ 0⤋
1) because they haven't developed any chloroplasts, these are the pigments that give green color and they absorb light to make food. Also, it depends on how long it has been in the dark, chances are that if it has recently popped out of the seed and is white, it is because it is still getting its nutrients from the cotyledon(like the yoke for an egg where a baby gets it nutrients, but for a seed)
2)Does the dark environment have any event the slightest crack of light? Cuz this will cause photoentrophy, where the plant reacts to light. Because there is so little light, the plant will grow more to try to get to it (say if there was a hole in the corner of a box), unlike ones by the window which get as much light as they want. Think of it as rich versus not so rich. The rich get what they want all the time, but the not-so-rich will get it every-s-often, so they value it more and will try to get it faster.
2006-09-22 10:47:04 · answer #2 · answered by ~*Prodigious*~ 3 · 0⤊ 1⤋
2) Beans that grow in the dark, have shoots that have more auxin (the hormone of plants) at the shoots, working to make the plants grow more taller and try to reach for sunlight. For info on Auxin, visit the website below.
I am not sure about question 1.
2006-09-22 13:45:38 · answer #3 · answered by sherrylboodramhot 2 · 0⤊ 1⤋
well, young miss, it's like this.
1) the lack of cloriohile is caused by the absence of sunlight because the material is produced in the photosynthetic process.
this process is dependent on sunlight for catalyst and energy.
2) the ones growing in the dark get taller (in effect, grow taller faster) because they are attempting to "penetrate the darkness" and reach sunlight. plants, being of highly limited intelligence, understand only that "the sun is upwards..."
Hope this helps
2006-09-22 10:43:57 · answer #4 · answered by full_tilt_boogie 4 · 1⤊ 0⤋
1) Plants need to be exposed to sunlight (or artificial sunlight) in order for the photosynthesis process to work. This must be tied in with the ability for it to produce chlorophyl.
2) The plants growing in the dark are searching for light. They will be taller and thinner. The ones in the window are already exposed to light and therefore can build up stronger supportive stalks.
2006-09-22 10:45:39 · answer #5 · answered by Shafe 1 · 0⤊ 1⤋
1) because they are covered with black paper, the sun can't pass directly and the plant can't mak ephotosynthesis as much as the ones with no black paper, so with no photosynthesis the plant can't produce pigment, so it's white.
2) because they are looking for light, so the plant grows taller in search of some sunlight.
2006-09-22 16:37:30 · answer #6 · answered by Anonymous · 0⤊ 1⤋