امتحان ساينس science -الوحدة 3- مقرر ابريل- اولى اعدادي - ترم ثاني

هذه معاينة نصية للأسئلة للاطّلاع والمراجعة فقط. لخوض الاختبار تفاعليًّا مع تصحيح آلي ونتيجة فورية، اضغط زر «ابدأ الاختبار» أدناه.

1. What is the fundamental unit in the classification of living organisms?
   • أ. Species
   • ب. Ecosystem
   • ج. Community
   • د. Population
2. What is a group of individuals of the same species living in the same place at the same time called?
   • أ. Population
   • ب. Ecosystem
   • ج. Biotic factor
   • د. Community
3. Which of the following describes a biological community?
   • أ. Different populations of species living in the same environment
   • ب. Living and non-living components interacting
   • ج. Only abiotic factors in an area
   • د. A single living organism
4. Which nutritional relationship benefits one organism while harming the other?
   • أ. Predation
   • ب. Competition
   • ج. Commensalism
   • د. Mutualism
5. What type of relationship exists when two individuals compete for limited food resources?
   • أ. Competition
   • ب. Predation
   • ج. Mutualism
   • د. Commensalism
6. In mutualism, how do the interacting species affect each other?
   • أ. Both benefit
   • ب. One benefits, the other is harmed
   • ج. One benefits, the other is unaffected
   • د. Both are harmed
7. Which of the following is an example of mutualism?
   • أ. Bees pollinating flowers while collecting nectar
   • ب. A bird eating insects from a crocodile’s teeth
   • ج. Two plants competing for sunlight
   • د. A lion hunting a zebra
8. In commensalism, how are the two organisms affected?
   • أ. One benefits, the other is unaffected
   • ب. Both are unaffected
   • ج. One benefits, the other is harmed
   • د. Both benefit
9. Which of the following is an example of commensalism?
   • أ. Egyptian plover birds cleaning a crocodile’s teeth
   • ب. fungi and algae forming lichen
   • ج. Wolves hunting deer
   • د. A tapeworm living inside a human intestine
10. . What is the relationship called when two individuals of the same species compete for limited food?
    • أ. Intraspecific competition
    • ب. Predation
    • ج. Symbiosis
    • د. Interspecific competition
11. What does the term "ecosystem" refer to?
    • أ. Both living organisms and non-living components like water, air, and soil
    • ب. Only the interactions between species
    • ج. Only non-living components like water and air
    • د. Only living organisms
12. . Which of the following is the smallest unit of classification in an ecosystem?
    • أ. Individual
    • ب. Biotic population
    • ج. Population
    • د. Biological community
13. . What is a biotic population?
    • أ. A group of individuals of the same species living in a particular area at the same time
    • ب. A group of individuals from different species
    • ج. An individual organism from a species
    • د. The various populations of different species living in the same environment
14. Which of the following is an example of predation?
    • أ. An animal eating another animal for food
    • ب. A bird feeding on leftovers from a crocodile’s teeth
    • ج. Bees extracting nectar from flowers
    • د. Two individuals of the same species fighting over food
15. Which relationship benefits one organism without harming the other?
    • أ. Commensalism
    • ب. Predation
    • ج. Competition
    • د. Mutualism
16. What happens in a competitive relationship between two individuals of the same species?
    • أ. Both individuals compete for a limited food source, negatively impacting their growth or survival
    • ب. They both benefit from each other
    • ج. One individual benefits and the other is harmed
    • د. Both individuals benefit without causing harm to each other
17. What is the role of the bees in the mutualistic relationship with plant flowers?
    • أ. Bees transfer pollen grains, promoting floral reproduction
    • ب. Bees compete for nectar with other bees
    • ج. Bees protect the flowers from predators
    • د. Bees are harmed by the flowers
18. What is the main source of energy for all living organisms on Earth?
    • أ. Sun
    • ب. Wind
    • ج. Soil
    • د. Water
19. What is the path of energy transfer in the form of food from one organism to another called?
    • أ. Food chain
    • ب. Energy cycle
    • ج. Trophic cycle
    • د. Food web
20. What is a trophic level?
    • أ. A stage where energy is transferred in the food chain
    • ب. A type of consumer in the food chain
    • ج. A level for decomposers
    • د. A level of producers in an ecosystem
21. . Which organism occupies the first trophic level in a food chain?
    • أ. Producers
    • ب. Carnivores
    • ج. Decomposers
    • د. Herbivores
22. What are decomposers responsible for in an ecosystem?
    • أ. Breaking down organic substances in dead organisms
    • ب. Eating both plants and animals
    • ج. Consuming herbivores
    • د. Producing food for other organisms
23. What is the process of using living organisms to control agricultural pests called?
    • أ. Biological control
    • ب. Genetic modification
    • ج. Sustainable farming
    • د. Natural selection
24. . Which of the following animals is known as an omnivore?
    • أ. Bear
    • ب. Eagle
    • ج. Lion
    • د. Horse
25. . What is the role of scavengers in the ecosystem?
    • أ. They feed on the remains of dead organisms
    • ب. They are primary producers
    • ج. They feed on both plants and animals
    • د. They break down organic substances in the soil
26. What type of teeth are most herbivorous animals, like the horse, adapted with?
    • أ. Incisors for cutting plants
    • ب. Flat molars
    • ج. Teeth for tearing prey
    • د. Sharp canines
27. Which of the following is an example of a scavenger?
    • أ. Hyena
    • ب. Lion
    • ج. Bear
    • د. Ladybug
28. What is the main source of energy for producers in an ecosystem?
    • أ. Sun
    • ب. Soil
    • ج. Water
    • د. Air
29. What is the path of energy transfer from one organism to another called?
    • أ. Food chain
    • ب. Trophic cycle
    • ج. Nutrient loop
    • د. Energy web
30. Which of the following is always the first trophic level in a food chain?
    • أ. Producer
    • ب. Carnivore
    • ج. Decomposer
    • د. Herbivore
31. What are decomposers responsible for?
    • أ. Breaking down dead organisms into simpler substances
    • ب. Hunting prey for food
    • ج. Competing with producers for resources
    • د. Producing energy from sunlight
32. Which of the following is an example of biological control?
    • أ. Using ladybugs to eat aphids
    • ب. Cutting down infected plants
    • ج. Irrigating fields with chemicals
    • د. Using pesticides to kill insects
33. Which teeth are most prominent in carnivores like lions for tearing prey?
    • أ. Canines
    • ب. Premolars
    • ج. Incisors
    • د. Molars
34. What do we call organisms that eat both plants and animals?
    • أ. Omnivores
    • ب. Scavengers
    • ج. Carnivores
    • د. Herbivores
35. What are organisms that feed on dead remains called?
    • أ. Scavengers
    • ب. Parasites
    • ج. Decomposers
    • د. Producers
36. What is a food web?
    • أ. A network of interconnected food chains
    • ب. A diagram showing energy transfer in a food chain
    • ج. A list of producers and consumers
    • د. A single food chain
37. What happens when a food source becomes scarce in an ecosystem?
    • أ. Competition among living organisms increases
    • ب. Species will adapt quickly without competition
    • ج. Energy flow is unaffected
    • د. The ecosystem remains unchanged
38. What is the result of the absence of a species in a balanced ecosystem?
    • أ. The remaining organisms in the food chain may be disrupted
    • ب. All organisms thrive without the species
    • ج. Only producers are affected
    • د. The ecosystem adapts and maintains balance
39. What happens if the number of primary consumers increases?
    • أ. The number of producers decreases and secondary consumers increase
    • ب. The number of tertiary consumers decreases
    • ج. The number of secondary consumers decreases
    • د. The number of producers increases
40. What is the role of the energy pyramid in an ecosystem?
    • أ. It represents the energy flow and amounts between trophic levels
    • ب. It illustrates competition in the food chain
    • ج. It tracks nutrient cycling in ecosystems
    • د. It shows the number of organisms at each trophic level
41. Where is the greatest amount of energy found in the energy pyramid?
    • أ. At the base of the pyramid
    • ب. At the middle of the pyramid
    • ج. At the secondary consumers level
    • د. At the top of the pyramid
42. How much energy is transferred from one level to the next in the energy pyramid?
    • أ. 10%
    • ب. 50%
    • ج. 90%
    • د. 100%
43. What happens to the energy when it moves from one trophic level to the next?
    • أ. 90% of energy is lost
    • ب. The energy doubles
    • ج. Energy stays constant
    • د. All energy is transferred
44. What is formed when multiple food chains interconnect?
    • أ. Food web
    • ب. Trophic loop
    • ج. Scavenger network
    • د. Energy pyramid
45. What happens if an organism is removed from a balanced ecosystem?
    • أ. Disruption or destruction of ecological balance
    • ب. Immediate collapse of all food webs
    • ج. Only decomposers are affected
    • د. No effect on other organisms
46. If primary consumers increase, what happens to producers?
    • أ. Decrease
    • ب. Stay the same
    • ج. Become omnivores
    • د. Increase
47. A decrease in secondary consumers would lead to:
    • أ. Fewer tertiary consumers
    • ب. More primary consumers
    • ج. Both a and b
    • د. More producers
48. Where is the top predator located in the energy pyramid?
    • أ. Apex
    • ب. Middle
    • ج. Not included
    • د. Base
49. What happens to the remaining 90% of energy not transferred to the next level?
    • أ. Lost as heat or used for metabolism
    • ب. Recycled by decomposers
    • ج. Converted to sunlight
    • د. Stored forever
50. What results from a lack of food sources in an ecosystem?
    • أ. Increased competition
    • ب. Increased cooperation
    • ج. Reduced competition
    • د. More energy for all