Which of the following pairs are homologous structures?

A. Oral groove of Paramecium and mouth of rotifer


B. Rhizoid of moss and root of dandelion


C. Spine of cactus and blade of kelp


D. Wing of bird and flipper of whale


E. Wing of bat and wing of mosquito





18. A(n) ________ moves about by means of pseudopodia.





A. amoeba


B. ciliate


C. diatom


D. euglenozoan


E. trypanosome





19. Which of the following is most dependent on liquid water for reproduction?





A. Angiosperm


B. Conifer


C. Fern


D. Ginkgo


E. Gnetophyte





20. After reaching the ovule, a pollen grain germinates and develops into a(n) ________.





A. carpel


B. male gametophyte


C. ovary


D. spore


E. sporophyte embryo

Which of the following pairs are homologous structures?
18. A


19. C



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