6. The hollow ball of cells with inner mass is A) Blastula B) blastocyst C gastr

Question

6. The hollow ball of cells with inner mass is A) Blastula B) blastocyst C gastrula D) morula 7. Sewage and fertilizer runoffs result in rapid growth of cyanobacteria and algae called A) symbiosis B) eutrophication C)stratification Increase of DDT in great lakes food web is A) symbiosis B) eutrophication C) stratification D) biomagnification D) biomagnification 8. 9. Fertilization takes place in A) ovary B) oviduct C) uterus D) vagina 10. The part of brain, regulates balance A) medulla B) cerebrum C) limbic system D) cerebellunm 11. The study of vital statistics of populations and how they change over time is A) life table B) survivorship curves C) demography D) ecological niche

Explanation / Answer

6. B

Blastocyst is a ball of cells which has inner cell mass and outer trophoblast cells

7. B

Eutrophication results in the accumulation of nutrients and minerals which induce growth of plants and algae.

8. D

Biomagnification results in the increased levels of pesticides with each trophic level.

9. B

Fertilization results in the fusion of gametes to form zygote. This occurs in oviducts or fallopian tubes.

10. D

Cerebellum controls body posture, maintains muscle tone, coordinates muscular activities and equilibrium of the body.

11. C

Demography is the study of the group characteristics or parameters of the population, their change over time and prediction of future changes.

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