Are these examples of angiosperm seeds?

Question

I need 3 different types of angiosperm seeds.

So I have seeds of an apples, a piece of grass and 3 grains of rice.

If some of these aren't angiosperm seeds, plase advise me on some other "different types" of angiosperm seeds.

Thanks

Answer 1

Land plants evolved from marine algae which reproduced rather like humans. Eggs were fretilized by sperm cells which used water to support them. The first land plants were similar. Late in plant evolution, the dependance on water was broken. Gymnosperms such as pines developed dry pollen grains which were spread on the wind. The eggs remained between the scales of a cone like structure but had no actual covering themselves. This is why "gymnosperm" translates to mean "naked seed". Flowering plants (angiosperms) evolved late in the evolution of the dinosaurs. They had pollen as well, but the eggs were covered by a protective layer produced by the plant. These structures are called ovaries and form at the base of flowers, another trait of angiosperms (or "flowering" plants). This protective layer can be thin like paper as it is in grains, hard and fibrous like a coconut or succulaent and edible, like any kind of fruit.

An angiosperm seed is any seed which came from some kind of fruit. Even wheat has a kind of fruit which is nothing more than a dry husk. As long as the seed came from something other than a pine cone, it will be angiosperm seed. Ferns and mosses do not produce seeds, but reproduce using spores which are far smaller than seeds.

Answer 2

Apple seeds: yes.

Rice grains: only if they have their husks still (rice grains are technically just the endosperm of seeds).

A piece of grass: no (if you're talking a blade of grass).

Other (easy to access) examples? Seeds in pears, grapes & oranges; the pit in cherries, mangoes & avocados; a kernel of corn; and any one of many beans available in bulk food stores (e.g., mung bean; just go with dried, so that they don't rot).

See:

http://users.rcn.com/jkimball.ma.ultrane...

Hope that helps! :)