UBC BIO 210 Exam Questions with Correct Answers

UBC BIO 210 Exam Questions with Correct Answers What defines vascular plants? - Answer-1. Sporophyte is dominant, independent and branched. 2. Contain xylem (lignin) and phloem. What kind of branching do lycophytes have? - Answer-Dichotomous. What is dichotomous branching? - Answer-When the meristem divides in two. Are lycophytes microphyllous or megaphyllous? - Answer-Microphyllous. What is microphyll? - Answer-A plant leaf with one single, unbranched vein. Are leaf traces present in lycophytes? - Answer-No. Where do endogenous roots in lycophytes arise? - Answer-From the pericycle of the stem. Where are sporangia borne on lycophytes? - Answer-On the adaxial surface of leaves called sporophylls. What does plectostele arrangement mean? - Answer-When xylem is interrupted by phloem plates. What kind of xylem maturation does a plectostele arrangement have? - Answer-Exarch. Compare root and stem anatomy in lycophytes. - Answer-They are very similar. Both are protostele or plectostele. How do roots in lycophytes branch? - Answer-Dichotomously. How are sporophytes in Lycopodia arranged? - Answer-In a cone or strobilus. Are Lycopodia homosporous or heterosporous? - Answer-Homosporous. Is the Lycopodia gametophyte self-compatible? - Answer-No. Are Lycopodia endosporic or exosporic? - Answer-Exosporic. How do Lycopodia gametophytes obtain nutrition? - Answer-They are either: a) Long lived, white and subterranean. (Fungal symbiosis) b) Short lived, green and on surface. (Photosynthesis) How are sporophytes in Selaginella arranged? - Answer-In a strobilus. What does the adaxial surface of Selaginella have? - Answer-A ligule. What does a ligule do? - Answer-It secretes mucilage to protect young leaves. Describe the protosteles of Selaginella. - Answer-Protosteles occupy a hollow, central lacuna, held in place by a trabecula. Are Selaginella heterosporous or homosporous? - Answer-Heterosporous. What do microspores develop into in Selaginella? - Answer-Male gametophytes and sperm. What do megaspores develop into in Selaginella? - Answer-Female gametophytes and eggs. Are Selaginella gametophytes endosporic or exosporic? - Answer-Endosporic. What does it mean if a gametophyte is endosporic? - Answer-All development happens within the spore wall. Are Selaginella self-compatible? - Answer-No. Are Isotaceae heterosporous or homosporous? - Answer-Heterosporous. Which Lycophyte is the only homosporous one? - Answer-Lycopodia. Which Lycophyte has no ligule? - Answer-Lycopodia. What kind of branching does Isotaceae have? - Answer-Dichotomous. Describe secondary growth in Isotaceae. - Answer-Isotaceae experience small amounts of secondary growth from a unifacial cambium. What is the extinct Isotaceae ancestor called? - Answer-Lepidodendraceae. What has evolved several times in Lycophytes? - Answer-Secondary growth and heterospory. Which Lycophytes have secondary growth? - Answer-Isotaceae and Lepidodendraceae.