Why is excretion an important life process?a.It helps organisms maintain their temperature.b.It removes wastes and toxins from an organism.c.It helps organisms break down food.

What is the primary purpose of excretion in cellular metabolism?To produce energyTo synthesize proteinsTo remove waste by-productsTo regulate cell growth       Which of the following organisms breaks down food material outside the body before absorbing it?MammalsFungiBirdsReptiles       How do the digested substances enter Amoeba's cytoplasm?Through active transportThrough diffusionThrough facilitated diffusionThrough osmosis

The excretory function removes wastes from the body that can become toxic.

Decomposition is a physical and chemical process by which dead organic matter is broken down. Why is decomposition important to life processes?

Body systems within multicellular organisms work together to keep them alive. For example, cells need breaks down glucose to release energy in a formthat your cells can then use. This process also requires , a wasteproduct. Your digestive, circulatory, respiratory and excretory systems work together to provide your with nutrients and oxygen, and to remove wastes such as carbon dioxide

1)      a.) Define excretion.                                        (1 mark)b.) In two (2) ways differentiate between excretion, elimination and secretion.                                     (2 marks)c.) State five (5) ways excretion is important.    (3 marks)d.) Explain why egestion is not referred to as an excretory process.                                                  (2 marks)e.)  Make a well-labelled diagram of the nephron 8cm-10cm long.                                                               (2 marks) 2)      (a) (i) What is cellular respiration?            (1 mark)a.    (ii) In a tabular form, state four differences between anaerobic and aerobic respiration                      (2 marks)b.    (b.) Enumerate five (5) micro and macro nutrients each for healthy development of plants and animals.                                                                                         (5marks)c.    (c.) Give two examples each of the following types of organisms:                                                        (2 marks)(i)   parasitic plants (ii) saprophytes 3)   (a)  Explain the process of feeding in the following organisms:                                                               (5 marks)(i.) Amoeba  (ii.) Paramecium (iii.) Euglena (iv.) Chlamydomonas (v.) Spirogyrab.      List four (4) excretory organs in humans and name one waste product excreted by each organ       (2 marks)c.       List three functions of the kidney.           (1.5 marks)d.      Give three reasons why organisms require energy.                                                                                    (1.5 marks)4)  a.) In a tabular form, distinguish between light phase and dark phase.                                                   (2 marks)b.) Explain the meaning of growth.                   (1 mark)(c.) State the monomer units and polymers of the four (4) biological molecules.                                    (2 marks)(d) State the deficiency symptoms of the following vitamins:                                                               (1 mark)(i) vitamin A: __________________________________(ii) vitamin C: __________________________________(ii) Vitamin K: __________________________________(e). What is the difference between mitosis and meiosis?                                                                 (1 mark)(f.) For each of the following organisms state the mode of nutrition (way of obtaining food) by placing them under the headings: Holozoic  Parasitism  Saprophytism   Symbiotic  Autotrophic    Human,    Mushroom,    Venus flytrap,    Waterleaf plant,    Tapeworm,    Elephant grass,Housefly,    Lichen,    Spirogyra,    Rhizopus,    pitcher plant,    mold,   bacteria,   Plasmodium