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21. How old is a boy when he experiences bodily changes? *
1 point
A. between 5 to 10 yrs. old
B. between 9 to 10 yrs. old
C. between 10 to 17 yrs. old
D. between 7 to 17 yrs. old
22. Which of the following changes is experienced by a girl during puberty? *
1 point
A. enlargement of breast
B. Voice deepens
C. muscles develops
D. broader shoulder
23. Menstruation is a sign that a girl is __________________. *
1 point
A. Already pregnant
B. capable of producing offspring
C. no longer capable of becoming pregnant
D. already menopausal
24. This kind of reproduction involves two parents. *
1 point
A. Asexual reproduction
B. Bisexual Reproduction
C. Sexual Reproduction
D. None of the above
25. This is a part of the female reproductive system of butterfly that is responsible for the production of oocytes. *
1 point
A. Accessory gland
B. Ovaries
C. Common oviduct
D. Vulva
26. Dogs and cats reproduce___________________. *
1 point
A. asexually
B. sexually
C. through external fertilization
D. none of above
27. The female reproductive organ of a flower is composed of___________. *
1 point
A. Stigma, Style, and Ovary
B. Stigma, Anther, and Filament
C. Stigma, Style, and Anther
D. Style, Anther and Filament
28. When the ovules of a flowers mature, it becomes___________. *
1 point
A. Flower
B. Fruit
C. Leaves
D. Seeds
29. It is a kind of ecosystem where the ocean is covered and uncovered as the tide goes in and out. *
1 point
A. Food chain
B. intertidal zone
C. estuaries
D. food web
30. Which of the following is an example of producer in an ecosystem? *
1 point
A. blue heron
B. fish
C. marsh plant
D. plankton