Q: What causes maple leaves to change their colors? Choices: - artificial preservatives - factor reactions - radiation reactions - chemical reactions A:
chemical reactions

(Question)
Q: Each microspore develops into a pollen grain containing a male what? Choices: - progesterone - zygote - sperm - gametophyte A:
(Answer)
gametophyte

Ques: Q: How many different kinds of ions are produced when sodium chloride dissociates ? Choices: - five - one - three - two A:
Ans: two

(Q).
Q: The speed of a particle in what state is directly proportional to the temperature of the system? Choices: - frozen - solid - liquid - gas A:
(A).
gas

Ques:Q: What is made up of the pinna, ear canal, and eardrum? Choices: - the epidermis - the inner ear - the nervous system - the outer ear A:

Ans:the outer ear

Ques:Q: What is it called when pollen from one plant fertilizes another plant of the same species? Choices: - cross-typing - cross-breeding - cross - vegetation - cross-pollination A:

Ans:
cross-pollination