A) True B) False function to remove excess water in amoeba and paramecia 28. The

Question

A) True B) False function to remove excess water in amoeba and paramecia 28. The male sex organ in moss is known antheridia A) True B) False as the archegonium; the female sex organ is known as the the 29. Parallel substitutions occur when the same subetitutions in the sane positions happen in different descendants. A) True B) False 30. All cukaryotes that are not plants, fingi, or animals have traditionally been called protists A) True B) False The red tides that can kill tons of fish are caused by toxic species of dinoflagellates. A) True 31. B) False Match the following: 32. This type of speciation occurs in the absence of a A) "-aceae" physical barrier 33. Derived traits that are shared among a group of B) Sympatric C) obligate aerobes species are known as 34. Land plants, sometimes referred to as may be defined as multicellular, photosynthetic eukaryotes that develop from embryos protected by tissues of the parent. 35. In plant classification, the suffix s D) Embryophytes used to denote names of families. E) Synapomorphies 36. Bacteria unable to survive for extended periods in the absence of oxygen are termed 37, Which of the following pases is thought to have contributed to the appearance of multicell organisms? A) Oxygen B) Hydrogen C) Nitrogen D) Carbon E) Sulfur

Explanation / Answer

27. A). True. Amoeba and Paramecium live in fresh water. Water enters their body continuously. As a result of which, they face the risk of bursting, but contractile vacuoles store the excess water and expel it outside the body. Along with water, waste material is also removed. Hence, contractile vacuoles do the function of osmoregulation.

28. B). False. In moss, the male sex organ is known as antheridia and female sex organ is known as archegonium.

29. A). True.

30. A). True. Protists are a group of unicellular eukaryotes. Plants, fungi and animals are multicellular eukaryotes.

31. A). True. Some species of dinoflagellates for ex. Gonuaulax, produce "Saxitoxin" , a toxic substance which kills fish and other marine organisms.

32.B).Sympatric

33. E). Synapomorphies. ex. Mammary glands of mammals in relation to other tetrapods.

34. D). Embryophytes

35. A). "-aceae". Ex. Malvaceae - Hibiscus or China-rose family.

36. C). Obligate aerobes. Organisms that can not live without oxygen. Obligate means compel.

37. A). Oxygen. Oxygen is highly reactive gas. When organisms started using oxygen of atmosphere, oxygen acted as a source of energy and that helped organisms to multiply and grow. So, multicellularity developed.

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