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.
26. Which of the following is a basic characteristic shared by all living organisms?
All living organisms share certain characteristics, including the ability to reproduce; using computers, glowing, or being photographed are not universal features of life.
27. What is the smallest unit that can carry out all the processes of life?
The cell is the basic structural and functional unit of all living organisms and can perform all life processes; atoms and molecules are smaller but not living units, and organs are made of many cells.
28. In which part of a plant cell does photosynthesis mainly take place?
Chloroplasts contain chlorophyll and are the organelles where photosynthesis converts light energy into chemical energy; mitochondria are for respiration, nucleus contains DNA, and cell wall is structural.
29. Which organelle is primarily responsible for releasing energy from food in cells?
Mitochondria are the 'powerhouses' of the cell where cellular respiration occurs to release usable energy (ATP) from food molecules.
30. Which statement best describes osmosis?
Osmosis is the passive movement of water across a semi-permeable membrane from a region of higher water potential (lower solute concentration) to a region of lower water potential.
31. Which group consists of organisms that are prokaryotic (lack a true nucleus)?
Bacteria are prokaryotes and do not have a membrane-bound nucleus; animals, plants, and fungi are eukaryotes with nuclei.
32. Which organisms are called producers in an ecosystem?
Producers (autotrophs) like green plants and algae make their own food by photosynthesis and form the base of food chains; herbivores and predators are consumers, fungi are decomposers.
33. What is the correct flow of energy in a simple food chain?
Energy flows from producers (plants) to primary consumers (herbivores) and then to secondary consumers (carnivores); it does not flow from consumers back to producers.
34. Which of the following is an example of a producer commonly found on the Kenyan savannah?
Grass is a photosynthetic plant that produces its own food and serves as a primary producer on the savannah; lions and hyenas are consumers, vultures are scavengers.
35. What is the main ecological role of decomposers like fungi and bacteria?
Decomposers break down dead organic matter into simpler substances, returning nutrients to the soil and completing nutrient cycles; they do not produce oxygen or act as producers.
36. What is transpiration in plants?
Transpiration is the process where water evaporates from leaf surfaces, mainly through stomata; it is not energy conversion, mineral absorption, or translocation of food.
37. Which process involves the fusion of male and female gametes to form a zygote?
Sexual reproduction involves fusion of male and female gametes to form a zygote; asexual reproduction, binary fission, and budding do not involve gamete fusion.
38. Which organism typically reproduces by binary fission?
Most bacteria reproduce asexually by binary fission, where one cell divides into two identical daughter cells; humans, plants, and fungi use different reproductive methods.
39. What does the term homeostasis refer to in living organisms?
Homeostasis is the process by which organisms keep internal conditions (like temperature, pH, water balance) relatively constant despite external changes.
40. Which of the following animals is a vertebrate?
Snakes are vertebrates with a backbone; earthworms, jellyfish, and sponges are invertebrates without a vertebral column.
41. What is the primary function of root hairs on plant roots?
Root hairs increase surface area for absorption of water and dissolved minerals; photosynthesis occurs in leaves, flowers are for reproduction, and storage is done by specialized tissues.
42. Which human body system is mainly responsible for transporting oxygen and nutrients to body cells?
The circulatory (cardiovascular) system transports oxygen, nutrients, hormones, and waste products throughout the body via blood and vessels.
43. What is a habitat?
A habitat is the natural environment where an organism lives and obtains its needs; a group of species is a community, a diagram of feeding is a food web or chain, and all ecosystems form the biosphere.
44. Which of the following is a structural adaptation for feeding on nectar?
A long slender beak is a physical (structural) adaptation that allows certain birds to reach nectar in flowers; hunting in packs and migrating are behavioral, shivering is physiological.
45. Which factor is abiotic (non-living) in an ecosystem?
Abiotic factors are non-living environmental components like temperature, light, and rainfall; predators, diseases, and competitors are biotic (living) factors.
46. What is the role of stomata on a leaf?
Stomata are pores on leaf surfaces that allow gas exchange (CO2 in, O2 out) and water vapor loss (transpiration); they do not absorb soil nutrients or store food.
47. What is a population in ecological terms?
A population consists of members of a single species living in a defined area; a community includes different species, and ecosystem includes living and non-living components.
48. Which component of human blood mainly carries oxygen to body tissues?
Red blood cells contain haemoglobin which binds and transports oxygen from the lungs to tissues; plasma carries dissolved substances, platelets help clotting, white blood cells fight infection.
49. Which process in plants produces oxygen as a by-product?
Photosynthesis uses carbon dioxide and water with light energy to produce glucose and oxygen; respiration uses oxygen and releases CO2, transpiration is water loss.
50. Which organism is an example of a primary producer in a freshwater pond?
Algae are photosynthetic organisms that produce their own food and form the base of pond food chains; frogs, fish, and herons are consumers.
51. Which of the following is a basic characteristic of all living organisms?
All living organisms are composed of one or more cells; being made of cells is a fundamental characteristic of life.
52. What is the basic unit of structure and function in living organisms?
The cell is the smallest unit that can carry out all life processes, making it the basic unit of structure and function.
53. Which organelle is primarily responsible for photosynthesis in plant cells?
Chloroplasts contain chlorophyll and are the sites where light energy is converted into chemical energy during photosynthesis.
54. Plants such as maize and tea in Kenya make their food by photosynthesis. What term describes organisms that make their own food?
Autotrophs produce organic food from inorganic substances (e.g., plants use sunlight to make sugar), unlike heterotrophs that eat other organisms.
55. Which raw materials are required for photosynthesis?
Photosynthesis uses carbon dioxide and water (plus sunlight and chlorophyll) to produce glucose and oxygen.
56. Aerobic respiration in cells mainly takes place in which organelle?
Mitochondria are the organelles where most aerobic respiration occurs, producing ATP by breaking down glucose.
57. In the level of biological organisation, what comes after tissue?
Cells form tissues, tissues combine to form organs, which then form organ systems and organisms.
58. What is the main purpose of biological classification (taxonomy)?
Taxonomy groups organisms so scientists can identify, name and study them based on shared features.
59. What is the scientific (binomial) name of maize, an important crop in Kenya?
The binomial name for maize (corn) is Zea mays; Oryza sativa is rice, Triticum aestivum is wheat, Solanum tuberosum is potato.
60. Which tool would a student use in the laboratory to see cells more clearly?
A light microscope uses lenses and light to magnify small objects like cells for observation in school labs.
61. Which type of reproduction typically involves two parents and produces offspring with genetic variation?
Sexual reproduction combines genetic material from two parents, resulting in offspring with new combinations of genes.
62. Which adaptation helps trees like some acacia species survive in dry Kenyan regions?
Deep roots allow trees to access underground water during dry periods, a common adaptation in arid environments.
63. In a simple savanna food chain: grass β gazelle β lion, which organism is the producer?
Producers (like grass) make their own food by photosynthesis and form the base of the food chain.
64. Which of the following is an abiotic factor in an ecosystem?
Abiotic factors are non-living components (e.g., sunlight, temperature, water) while the others are living (biotic).
65. Which action best helps conserve biodiversity in Kenya?
Protected areas conserve habitats and species, helping maintain biodiversity and ecosystem health.
66. Which type of organism causes malaria?
Malaria is caused by Plasmodium species, which are protozoan parasites transmitted by Anopheles mosquitoes.
67. How do vaccines protect a person from infectious disease?
Vaccines expose the immune system to a safe form of a pathogen or its parts so the body can produce antibodies and memory cells.
68. In which part of the human digestive system does most absorption of nutrients occur?
The small intestine has a large surface area (villi) specialised for absorption of digested nutrients into the bloodstream.
69. What is the primary function of red blood cells in the human body?
Red blood cells contain haemoglobin which binds oxygen in the lungs and carries it to body tissues.
70. What term describes the process of keeping internal body conditions stable (for example temperature or blood sugar)?
Homeostasis is the regulation of internal conditions within narrow limits despite external changes.
71. Which step of the scientific method usually comes immediately after forming a hypothesis?
After hypothesising, scientists design and perform experiments to test whether the hypothesis is supported by evidence.
72. Which item should a student wear in the lab to protect their eyes during experiments?
Safety goggles protect the eyes from chemical splashes, flying particles, and other laboratory hazards.
73. Which type of cell division produces two identical daughter cells for growth and tissue repair?
Mitosis results in two genetically identical daughter cells and is used in growth, repair and asexual reproduction in some organisms.
74. Which is the male reproductive part of a flower?
The stamen is the male part of a flower and produces pollen; the stigma is part of the female carpel.
75. Why is biodiversity important for people in Kenya and elsewhere?
Biodiversity supplies resources (food, medicines) and ecological services (pollination, water purification) essential for human well-being.