Grade 10 general science β Introduction to General Science Quiz
1. Which of the following is NOT a characteristic of living organisms?
Living organisms require chemical processes (like photosynthesis) to convert sunlight into usable energy. Saying they produce energy from sunlight without any chemical processes is incorrect. Growth, response to stimuli and reproduction are true characteristics of life.
2. What is the basic structural and functional unit of all living organisms?
Cells are the basic structural and functional units of life. Tissues and organs are made of groups of cells, and organ systems are groups of organs working together.
3. Which sequence shows the correct order from smallest to largest level of biological organization?
Cells combine to form tissues, tissues form organs, and organs work together in organ systems, so the correct order from smallest to largest is cell β tissue β organ β organ system.
4. Which kingdom includes organisms like mushrooms and yeast?
Mushrooms and yeast belong to the kingdom Fungi. They are distinct from plants and animals and are often decomposers or saprophytes.
5. Which of these is an autotrophic organism commonly grown in Kenyan farms that makes its own food by photosynthesis?
Maize is a plant and an autotroph; it uses photosynthesis to make its own food. Bacteria like E. coli are usually heterotrophic, tapeworms are parasites, and mushrooms (fungi) are heterotrophic decomposers.
6. Where does photosynthesis take place inside plant cells?
Chloroplasts contain chlorophyll and are the organelles where photosynthesis occurs. Mitochondria are for respiration, ribosomes make proteins, and the nucleus stores genetic material.
7. Which gas is taken in and used by plants during photosynthesis?
Plants take in carbon dioxide from the air and, using light energy, convert it with water into sugars and oxygen during photosynthesis.
8. What is the main function of roots in most plants?
Roots absorb water and dissolved minerals from the soil and anchor the plant. Leaves usually carry out photosynthesis, while flowers are for reproduction.
9. Which organelles are mainly responsible for releasing energy during cellular respiration in animal cells?
Mitochondria are the 'powerhouses' of the cell where aerobic respiration breaks down glucose to release energy. Chloroplasts are for photosynthesis, cell walls are in plant cells, and vacuoles store substances.
10. Which pair correctly contrasts plant and animal cells?
Plant cells have rigid cell walls and chloroplasts for photosynthesis; animal cells lack these structures. Both types have cell membranes.
11. What term describes organisms that feed on other living things for energy?
Heterotrophs obtain energy by consuming other organisms. Autotrophs/producers make their own food (e.g., plants) using photosynthesis.
12. In a simple food chain from a Kenyan grassland, which organism is most likely a primary consumer?
Primary consumers eat producers (plants). A grasshopper feeds on plants and is a primary consumer, while lions are secondary/tertiary consumers and decomposers break down dead matter.
13. What is the role of decomposers in an ecosystem?
Decomposers (like bacteria and fungi) break down dead organic matter, recycling nutrients back into the environment for use by producers.
14. Which of the following best defines a habitat?
A habitat is the natural place where an organism lives and finds food, shelter and mates. A role in a community is called a niche; a population is organisms of the same species.
15. What is an example of an adaptation that helps plants survive in dry regions of Kenya?
Deep roots and water-storing stems help plants survive drought by accessing deep water or storing water during dry periods; thin broad leaves and open stomata increase water loss.
16. Which process describes the production of offspring by combining genetic material from two parents?
Sexual reproduction involves the fusion of gametes from two parents, producing offspring with genetic variation. Asexual reproduction (e.g., binary fission) produces genetically similar offspring from one parent.
17. Which human body system is mainly responsible for transporting oxygen and nutrients to cells?
The circulatory system (heart, blood, blood vessels) transports oxygen, nutrients and wastes around the body to and from cells.
18. What is homeostasis?
Homeostasis refers to keeping internal conditions (like temperature and blood sugar) stable despite external changes, essential for normal functioning.
19. Which example shows a behavioral adaptation in animals?
Migration is a behavioral adaptation (a change in behavior) that helps animals survive seasonal changes. A camel's hump and thorns are structural adaptations.
20. Which of these best describes a population in biology?
A population consists of members of the same species living in a particular place. A community includes different species, and an ecosystem includes living and non-living things.
21. Which laboratory safety practice is important when using sharp instruments like scalpels?
Cutting away from yourself and others and keeping fingers clear reduces the risk of injury. Other options are unsafe and can cause accidents.
22. Which is a correct simple statement of the role of producers in a food web?
Producers (mostly plants) use photosynthesis to convert sunlight into sugars, forming the base of the food web. Decomposers break down dead material; producers are not fungi.
23. Which statement about viruses is true in the context of life science for form 2 (age 15)?
Viruses are not cells and lack most cell structures; they can replicate only by infecting host cells and using host machinery to make new virus particles.
24. Which method of asexual reproduction is correctly matched with an organism that uses it?
Yeast reproduces asexually by budding. Binary fission occurs in bacteria and some protists, spore formation occurs in fungi and some plants, and vegetative propagation is used by plants.
25. Why is biodiversity important in ecosystems such as Kakamega Forest or Lake Victoria?
Biodiversity increases ecosystem resilience and provides resources and services (food, medicines, pollination). High biodiversity usually supports stability rather than fragility.