أسئلة علم الأحياء الصف السابع مع الحل

15 سؤالاً تدريبياً في علم الأحياء – الصف السابع

1. الفصل: Feeding Behavior in Animals · سهل

   1. Which term matches this definition: "an organism (bacteria, fungi) that breaks down dead organisms"?

   • A. producer
   • B. decomposer
   • C. omnivore
   • D. scavenger
   أظهر الجواب ▾

   Answer: decomposer

   Explanation: Decomposer: an organism (bacteria, fungi) that breaks down dead organisms

2. الفصل: Feeding Behavior in Animals · سهل

   2. What is the meaning of "granivore"?

   • A. an animal that feeds mainly on seeds
   • B. a herbivore with a several-part stomach that brings food back to the mouth to chew it again
   • C. an animal that eats the producers (a herbivore)
   • D. the sharp cheek teeth of carnivores that cut meat like scissors
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   Answer: an animal that feeds mainly on seeds

   Explanation: Granivore: an animal that feeds mainly on seeds

3. الفصل: Nutrition in Plants · سهل

   3. Which term matches this definition: "the loss of water vapour by the leaves, which pulls the raw sap upwards"?

   • A. transpiration
   • B. chloroplast
   • C. autotroph
   • D. stomata
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   Answer: transpiration

   Explanation: Transpiration: the loss of water vapour by the leaves, which pulls the raw sap upwards

4. الفصل: Nutrition in Plants · سهل

   4. What is the meaning of "raw sap"?

   • A. water and mineral salts rising from the roots to the leaves
   • B. water and sugars made in the leaves, carried to all the organs of the plant
   • C. the green pigment of plants that captures light energy
   • D. fine extensions of root cells that absorb water and mineral salts
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   Answer: water and mineral salts rising from the roots to the leaves

   Explanation: Raw sap: water and mineral salts rising from the roots to the leaves

5. الفصل: Respiration in Animals and Gas Exchange in Plants · سهل

   5. What is the meaning of "bronchi"?

   • A. the respiratory organs of mammals, birds and reptiles, made of millions of alveoli
   • B. the small openings on the sides of an insect's body through which air enters the tracheae
   • C. the two tubes that branch from the trachea and lead air into each lung
   • D. gas exchange through a thin moist skin, as in the earthworm
   أظهر الجواب ▾

   Answer: the two tubes that branch from the trachea and lead air into each lung

   Explanation: Bronchi: the two tubes that branch from the trachea and lead air into each lung

6. الفصل: Respiration in Animals and Gas Exchange in Plants · سهل

   6. What is the meaning of "cellular respiration"?

   • A. small openings in the bark of stems through which the plant exchanges gases
   • B. the two tubes that branch from the trachea and lead air into each lung
   • C. the reaction in cells that uses oxygen to release energy from glucose, producing CO₂ and water
   • D. the respiratory organs of mammals, birds and reptiles, made of millions of alveoli
   أظهر الجواب ▾

   Answer: the reaction in cells that uses oxygen to release energy from glucose, producing CO₂ and water

   Explanation: Cellular respiration: the reaction in cells that uses oxygen to release energy from glucose, producing CO₂ and water

7. الفصل: Reproductive Behavior in Animals · سهل

   7. Which term matches this definition: "the ritual behaviour of a male and a female before mating"?

   • A. internal fertilization
   • B. courtship (parade)
   • C. territory
   • D. parental care
   أظهر الجواب ▾

   Answer: courtship (parade)

   Explanation: Courtship (parade): the ritual behaviour of a male and a female before mating

8. الفصل: Reproductive Behavior in Animals · سهل

   8. What is the meaning of "sexual dimorphism"?

   • A. the joining of a sperm cell and an egg cell
   • B. the difference in appearance between the male and the female of a species
   • C. an animal whose young develop inside the mother and are born alive
   • D. keeping the eggs warm until they hatch
   أظهر الجواب ▾

   Answer: the difference in appearance between the male and the female of a species

   Explanation: Sexual dimorphism: the difference in appearance between the male and the female of a species

9. الفصل: Fertilization and Development · سهل

   9. Which term matches this definition: "the time during which a viviparous young develops inside its mother"?

   • A. gestation
   • B. larva
   • C. umbilical cord
   • D. moult
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   Answer: gestation

   Explanation: Gestation: the time during which a viviparous young develops inside its mother

10. الفصل: Fertilization and Development · سهل

    10. Which term matches this definition: "the first divisions of the zygote into 2, 4, 8… cells"?

    • A. foetus
    • B. larva
    • C. hatching
    • D. cleavage
    أظهر الجواب ▾

    Answer: cleavage

    Explanation: Cleavage: the first divisions of the zygote into 2, 4, 8… cells

11. الفصل: Reproduction in Flowering Plants · سهل

    11. Which term matches this definition: "the part of the embryo that comes out of the seed first and forms the root"?

    • A. pistil
    • B. pollen
    • C. pollination
    • D. radicle
    أظهر الجواب ▾

    Answer: radicle

    Explanation: Radicle: the part of the embryo that comes out of the seed first and forms the root

12. الفصل: Reproduction in Flowering Plants · سهل

    12. What is the meaning of "cross-pollination"?

    • A. pollination in which the pollen comes from another flower of the same species
    • B. the structure in the ovary that contains the female gamete and becomes a seed
    • C. the tiny grains made by the anthers that carry the male gametes
    • D. the swollen base of the pistil that contains the ovules and becomes the fruit
    أظهر الجواب ▾

    Answer: pollination in which the pollen comes from another flower of the same species

    Explanation: Cross-pollination: pollination in which the pollen comes from another flower of the same species

13. الفصل: Ecosystem and Natural Equilibrium · سهل

    13. Which term matches this definition: "the state in which the populations of an ecosystem stay roughly stable over time"?

    • A. biotope
    • B. parasitism
    • C. natural equilibrium
    • D. habitat
    أظهر الجواب ▾

    Answer: natural equilibrium

    Explanation: Natural equilibrium: the state in which the populations of an ecosystem stay roughly stable over time

14. الفصل: Ecosystem and Natural Equilibrium · سهل

    14. Which term matches this definition: "the set of interconnected food chains of an ecosystem"?

    • A. competition
    • B. food web
    • C. biocenosis
    • D. natural equilibrium
    أظهر الجواب ▾

    Answer: food web

    Explanation: Food web: the set of interconnected food chains of an ecosystem

15. الفصل: Action of Man on Ecosystems · سهل

    15. Which term matches this definition: "treating used materials so that they can be used again"?

    • A. soil erosion
    • B. extinction
    • C. recycling
    • D. pollution
    أظهر الجواب ▾

    Answer: recycling

    Explanation: Recycling: treating used materials so that they can be used again

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