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Home Q & A Board Biology-Related Homework Help Zoology and Botany (Moderator: ehd123)
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rlalonie28 rlalonie28
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12 years ago
My choices are
petals of the flower fall off and zygote begins to grow
wind blows pollen grain on the stigma
male sperm cell travels down pollen tube fertilizing female egg
zygote becomes embryo and ovule becomes seed coat
a tiny pollen tube grows into ovule
ovary grows into fruit

I need these in order and nothing online is helping.
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#1
12 years ago
Here is the life cycle in order. I listed all the part names below for you as well for reference.
1. mature sporophyte plant with flowers

2. pollen grain lands on the sticky stigma of a carpel extends a tube down to the ovule

3. deposits two sperm nuclei within the embryo sac. One sperm cell fertilizes an egg in the embryo sac
- this double fertilization is an angiosperm characteristic

4. this produces a zygote

5. zygote develops into an embryo. The second sperm cell fertilizes another female gametophyte cell which develops into a nutrient storing tissue called endosperm, which nourishes the embryo.
- double fertilization synchronizes the development of the embryo and food reserve within an ovule.

6. the whole ovule develops into a seed.
- the seeds enclosure within an ovary is what distinguishes angiosperms from gymnosperms which have a naked seed.
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angiosperms~ flowering plant~ flowers fruits and the life cycle
flower- short stem with four whorls(circular pattern) of modified leaves
- bottom are the sepals, usually green~ enclose the flower before it opens
-above the sepals are the petals, colorful to attract insects and other pollinators.
-reproductive structures are multiple stamens and one or more carpels.
-each stamen consists of a stalk-the filament- bearing a sac called the anther, in which the pollen grains develop.
- the carpel consists of a stalk-the style-with an ovary at the base and a sticky tip known as the stigma which traps pollen.
-the ovary is a protective chamber containing one or more ovules in which the eggs develop.
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