SCIENCE 4

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SCIENCE 4

LESSON MATERIAL

UNIT 1           UNIT 2           UNIT 3         UNIT 4         UNIT 5       UNIT 6           



EXERCISE

UNIT 1       UNIT 2        UNIT 3         UNIT 4          UNIT 5


UNIT 6       UNIT 7 OUR ENVIRONMENT        UNIT 8        UNIT 9 ECOSYSTEM      

Unit 7,8,9 Pre-Test

UNIT 10 Weather            

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UNIT 7 REPRODUCTION

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UNIT 7 REPRODUCTION 7.1 Reproduction Living things can produce offspring through asexual and sexual reproduction. Asexual reproduction require one parent. The young produced a clone of the parent. Several asexual reproduction method in animals: Budding, formation of internal buds,  fragmentation, regeneration. Sexual reproduction require two organism: a male and a female. Mature male organism produce reproductive cell called sperm cell . Mature female produce egg . Sperm cell and egg fuse and develop into the young. 7.2 How human life begins Sperm cell meets an egg and fuse. The fusion between male and female reproductive cells is called fertilization . Many sperm cells reach the egg, but only one sperm cell can fertilize the egg. The fertilized egg starts to form more cells. It attaches to the wall of mother womb and continue to develop and grow. The developing baby draws nutrients from mother’s blood through the umbilical cord . About nine month...
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UNIT 9 ECOSYSTEM

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UNIT 9 ECOSYSTEM 9.1 ECOSYSTEM Ecosystem are all the organisms living together in an area and their interaction with one another as well as their environment. An organism habitat are made up of A biotic (non-living) and B iotic (living) factors. Some A biotic factors are l ight, temperature and air. Sunlight is used by plant to make photosynthesis. The temperature of a habitat determine s the kinds of organisms living there. Plants and animals need oxygen for respiration all the time. Some B iotic factors are man and other animals, plants, bacteria and fungi. Human beings may change the environment through air, land, and water pollution. Animals have to compete with one another for food. Some bacteria and fungi can cause diseases. Plants have to compete with other plants for sunlight, water, and mineral salts from the soils. 9.2 MAKING A MODEL OF ECOSYSTEM 9.3 FACTORS THAT AFFECT THE ORGANISM The amount of sunlight affect the ...
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