Page 4 - 59. P6BST Answer key (old1)
P. 4

(d)   Decomposers


                             RECAP

                            Decomposers refer to living things that are able to break down dead matter so that the dead matter can become
                            simple substances. These simple substances will then become nutrients / fertilisers to help other living things to grow
                            better.



                 4    (a)   Statement B. Only mammals have the outer coverings of hair or fur.
                      (b)   Amphibian: It has moist skin.

                            Fish:      It has scales.



                 UNIT 2 : Revision 1
                 SECTION A


                 1       (4)      •   Water can make a wooden ruler to become damp. Therefore, wood is not waterproof.
                                  •   Both wooden ruler and metal block cannot be bent easily.
                                  •   A rubber band does not allow light to pass through, so it is not transparent.

                 2       (2)      •   Q and R do not have the same loads, so we cannot tell if rope Q would break also when
                                   30 kg of load is attached to it. Therefore, we cannot compare the strength of ropes Q
                                   and R.
                                  •   P, Q and S do not have the same loads attached to them, so we cannot compare the
                                   strength of ropes Q and R.

                 3       (2)      Strength refers to the ability to support heavy things or withstand a large force without
                                  breaking easily.

                 4       (2)      The school bag must be strong to withstand the weight of books without breaking easily.
                                  It must be flexible also so that it can be bent easily without breaking.
                 5       (4)      •   A transparent material allows us to see things on the other side of it.
                                  •   A thicker parcel box is able to withstand heavier object in it without breaking easily.
                 SECTION B

                 1    (a)   Material P. It can absorb the most amount of blue-coloured water, so it has the highest absorbency
                            of water.

                      (b)   It is waterproof / does not allow water to pass through.

                             RECAP

                            •   Absorbency refers to the ability of a material to soak up a liquid.
                            •   Waterproof refers to the ability of a material to repel water or a material that does not allow water to pass
                               through.








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