Key stage 3 Science Exercise
1. The sun is the main source of _________ on earth.
2. Plants used sun's energy for making food at the time of ________ .
3. Plants are called __________ because, they make their own food by getting energy from sun.
4. Animals are called __________ because, they eat plants and animals.
5. Animals that only eat plants are called ________ .
6. Animals that eat only animals are called ________ .
7. Animals that eat plants are called _________ .
8. Both animal and plant cells have ________ .
9. ______ are made from long, coiled molecules called DNA.
10. Each cell in humans body have ______ pairs of chromosomes.
11. A _____ is a small section of DNA.
12. Each person has ______ DNA.
13. Genes act in _________ .
14. Crick and ______ made a first DNA modal in 1953.
15. Skeleton supports all the _________ .
16. Many bones have soft tissue known as _________ .
17. Bone marrow produces ________ and white blood cells.
18. _______ are attached to bones through a band known as tendons.
19. Muscles enable the skeleton to ________.
20. ______ permit the skeleton to move.
Answers:1. energy 2. photosynthesis 3. producers 4. consumers 5. herbivore 6.carnivore 7. omnivore 8. nucleus 9. Chromosomes 10. 23 11. gene 12. different 13. pairs 14. Watson 15. soft tissues 16. bone marrow 17. red blood cells 18. Muscles 19. move 20. Joints