Question

Help??

Answer 1

How have the sporophyte and gametophyte changed as plants have evolved?
More recently evolved plants are mostly haploid gametophytes.
The sporophyte has become larger, but the gametophyte has not changed.
Many more recently evolved plants no longer have a sporophyte.
The gametophyte has become smaller, and the sporophyte has become larger.

Answer 2

Do you understand this question at all or would you like me to walk you through it?

Answer 3

I have no clue about this ..

Answer 4

That's perfectly fine! I'll explain it to you. Give me just a sec to type, please! :)

Answer 5

Are you still there?

Answer 6

Yes, sorry; lag...

Once upon a time, when plants were pretty unadvanced, their reproductive cycles were based on gametophytes, not sporophytes. Gametophytes is a fancy word for the sex cells (sperm and egg) in a plant. Sporophyte is a fancy word for... spore. Spores are kind of like seeds, but they are simpler and much smaller. They can be spread by animals and the wind much faster than seeds can. They also don't reproduce sexually (another time-saver). A good example of spore-plants are mushrooms. If a mushroom lets off spores, millions of little mushrooms will start growing in that area - no sexual interaction required.

Nowadays, plants have figured out that sexual (gametophyte) cycles take too much time. First, the plant has to do all this work to MAKE the sex cells, then they actually have to go out and send them to other plants... Too much work! So, they decided that spores were the way to go. Some plants still use gametophytes, but the trend now is to use spores. :) Based on this, do you think you could answer your question?

Answer 7

D!

Answer 8

You got it! :D

Answer 9

you are an excellent teacher!
I just have one more.. promise its my last

Answer 10

What structure forms during angiosperm fertilization but does not form during fertilization among other types of plants?
a haploid egg cell
a diploid zygote
a haploid sperm cell
a triploid cell

Answer 11

Just a sec... Restarting my computer. The lag is awful. :)

Answer 12

Okay, I'm back. I am sorry that I can't give you a more definitive answer; but I believe it is the diploid zygote. If you look at the other types of plants (such as gymnosperms) you can see that they produce haploid egg and sperm and triploid cells too.

Answer 13

Thanks !! :)

Answer 14

WAIT!!!!!!

Answer 15

WHAT???

Answer 16

what happened ??

Answer 17

Sorry, typo... triploid cell. That's what I meant. :)

Answer 18

oh ok!

Answer 19

:D