Well, this lecture is quite hard for me to fully understand http://www.english-test.net/toefl/listening/A_lecture_from_a_science_class.html , it's because of its vocabularies T_T and its knowledge.
That's why I must write it down so I can read all of this carefully, I read and rewrite at my own way :-D
The distinction between nuts and seeds makes many people confused, including scientists . Some dictionaries say they're the same, someone says nut is a fruit , others say nut can be a seed or a fruit .
Actually, in the nutshell, nuts are seeds but seeds cannot be nuts =.='
Part of a confusion is stem from (bắt nguồn từ) the fact that seeds and nuts are classified differently for botanical (thực vật học) purposes and culinary (rau quả) ones .
Botanists are the scientists who study plants, they consider a seed is a part of a tree , and it will grow up to a new tree if it is buried under ground and germinated . (nảy mầm)
In this respect it's similar to human egg (trứng người =)) , which becomes an embryo (phôi) when fertilized by sperm (khi được thụ tinh) . Sometimes plant embryo becomes enclosed, which its cover called integument (vỏ bọc) . So embryo and integument constitute a seed
An embryo can have no type of integument @@ . When these embryos grow, a tissue surrounding them develops into a fruit , as in berries or peanut .
A nut is a plant fruit, contains single seed which doesn't attach itself to the ovary (nhụy)
.... to be continue T_T
