END SEM 1 SCI EXAM

END SEMESTER EXAMIONATION SCIENCE YEAR SIX DECEMBER 2021. STUDENT NAME …………………………………………………………………………………… TIME 45 MINUTES. INSRUCTIONS: Answer all questions Submit your paper within the time given. Cheating in exams is strictly prohibited

1. There are hundreds of different animals in the world which is why scientists need to be able to group them. (a) Fill in the table by putting the tick () to show which features the animals have. (2mks) Features Scales Features Backbone Mammal Fish Birds Reptiles (b) How do we call animals that have backbones?(1mk) (c) How do we call animals without backbones?(1mk) 2. Seaweed Fish Seal (a) What is the name given to the seaweed in the food chain above?(1mk) (b) What other name, apart from consumer and carnivore, can be given to the seal in the food chain above?(1mk)

(c) In the space below, construct a food chain to show the feeding relationship between a plant, a cat, a bird and caterpillar.(2mks) 3. What do we mean by the following terms: (a) Electrical conductor(1mk) (b) Electrical insulator(1mk) 4. Animals and plants have different habitats (a) What is habitat?(1km) (b) What two things a habitat must provide for an animal or plant (2mks) 5. We have many different organs in the body. Which among the following organs controls the whole body?(1mk) (a) Brain (b) Heart (c) Stomach (d) Kidney

6. Amina makes dimmer switch. It works like this. The bulb lights up. How do the changes she makes to the circuit affect the brightness of the bulb? (a) Complete the table below by filling in the correct answer from the one in brackets. (2mks) Changes made Level of Brightness(Dimmer/Brighter/ No change) Shorten the resistance wire Add a second bulb Add a second cell Move the bulb near the cell

7. (a) Name the following parts(3mks) A B C (b) What is the work of the part labeled C above?(1mk) (c) The part in a flower that develops into seeds is called?(1mk)

8. Rearrange the living things in each feeding relationship below to make correct food chains. (a) Spinach bird caterpillar (1mk) (b) Human worm chicken kales(1mk) 9. Plants are producers in s food chain; it is because they are able to make their own food. What are the three things they require to make their own food? (3mks) 10. We should encourage the planting of trees so as to create forests. (a) What are two importance of forests?(2mks) (b) To conserve energy or to use less energy is very important. What are the ways in which we can do it?(3mks)

11. Acid rain is caused by sulfur dioxide dissolved in rain water to form acid rain. What are some of the effects of acid rain on the environment? (3mks) 12.Thin wires are not good in electrical conductivity for long distances. Give a reason for that. (1mk) 13.Air pollution has negative effects on the environment and people’s health. (a) Give three causes of air pollution (3mks) (b) Name two diseases people in polluted areas often get.(2mks) (c) Give one way in which trees help to minimize air pollution.(1mk)

14.Some plants grow in soils which have few nutrients, they trap insects and dissolve them hence called predator plants. Name one predator plant. (1mk) 15.Study the feeding relationship below: Grass grasshopper lizard hawk (a) What will happen if all lizards were killed? (2mks) (b) What will happen if the population of hawks suddenly increased? Give two possible predictions. (2mks) 16. Recycling is very important and it helps to minimize littering of the environment. (a) What is recycling? (1) (c) Give one disadvantage of recycling(1mk)

17. Global warming is not good on earth as well as the lives of people and animals. (a) What is global warming? (1mk) (b) Give one cause of global warming (1mk)