Question

PLEASE HELP WITH ALL QUESTIONS

QUESTION 1 1.1 Draw a fully-labelled diagram showing the process of conjugation in Spirogyra. (10) 1.2 List FOUR advantages and FOUR disadvantages of algae. (8) 1.3 Name the different terrestrial biomes of the world and give one diagnostic characteristic of each biome. (12) [30] QUESTION 2 2.1 By means of a labelled diagram, describe the life cycle of an angiosperm. Use blocks of information to explain each stage. (15) 2.2 What are the advantages and disadvantages of genetically modified plants? (10) 2.3 Briefly explain why ozone is an important atmospheric gas and what the effects of ozone depletion would be on plants. 2.4 Discuss what is meant by the "drivers of environmental change" and give one example. Also discuss what plans the National Government of South Africa has in place to combat negative impacts on the environment. (10) [40] 16 BOT1502/101/3/2020 QUESTION 3 3.1 Explain the "biological magnification" (5) 3.2 Identify and explain the role of dominant and keystone species in a community. (10) 3.3 Describe the carbon cycle in a typical terrestrial ecosystem. (15) [30]

Answer 1

1.2. Advantages of Algae a) Algao Grow Fast 6) Algoo can have high biofuel Yields c) Algae Consume com 1) Perify waste waters Disadvantages a) Need do grow under controlled temperature condition 6) Requires a considerable aber amount of hand and tho. c) Tes diliger production is carbon dependent d) Relatively high upfront capital cost 1.3 There are 8 terrestrial biomes i) Tropical Rain forst Characteristic - very high annual rain fall. 3) Savannas Have wet and day season and have all type of plants it) Sub-tropical desents->Low annual ferecipitation and lack of predictability in rainfall in Chaparral - It consist of various types of terrein including mountains & flains Jenporature grass lands have grossed and as the dominent vegetations. Trees and shrubs are absent wi) Persberature forests -> Chenacterized as regions with high levels of precipitation, humidity and deciduous tues vli) Boreal forests hong severe winters (up to 6 months with temperatura below freezing and short summers (50-100 days) vind Arctic Tandra Extremely cold climate , how brotic diversity limitation of drainage, short season of growth and reproduction, simple vegetation structure