(Q).
Q: What strong and lightweight manmade material is derived from hydrocarbons and used in ropes, tents and parachutes? Choices: - styrofoam - cellophane - aluminum - nylon A:
(A).
nylon

(Q).
Q: What is the inner cell mass formed by the cells of the blastocyst called? Choices: - xerophyte - amniotic cavity - ectoderm - embryoblast A:
(A).
embryoblast

(Q).
Q: Within each sporangium, hundreds of what kind of spores develop and are dispersed through the air? Choices: - diploid - polyploid - infertile - haploid A:
(A).
haploid