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Biology Olympiad Olympiad Junior Science — practice questions

Explore 30 free Olympiad Junior Science questions in Biology Olympiad Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Olympiad Junior Science questions and exercises with answers

Showing questions 1–30 of 30.

An electrical signal in a nerve cell starts at the dendrite and travels along the:Read the answer and worked solution →The tiny gap between the end of one neuron and the next one is called a:Read the answer and worked solution →The tissue built from a network of neurons and specialised for conducting signals is:Read the answer and worked solution →A boy pulls his hand from a flame before he even thinks. The pathway used is a:Read the answer and worked solution →Reflex arcs are formed in which part of the body?Read the answer and worked solution →The brain and the spinal cord together make up the:Read the answer and worked solution →Cranial nerves and spinal nerves together form the:Read the answer and worked solution →The human brain is divided into how many major regions?Read the answer and worked solution →The main thinking part of the brain, with regions for hearing and sight, is the:Read the answer and worked solution →Actions we cannot control by thinking are handled by the mid brain and the:Read the answer and worked solution →The part of the brain that gives precision to voluntary actions and keeps balance is the:Read the answer and worked solution →The leaves of the sensitive plant fold at a touch, yet the plant has no:Read the answer and worked solution →A shoot on a windowsill bends towards the light. This directional growth is:Read the answer and worked solution →Roots grow down and shoots grow up in answer to the pull of the earth. This is:Read the answer and worked solution →A pollen tube grows towards an ovule. This directional growth is an example of:Read the answer and worked solution →When light falls on one side of a shoot, auxin gathers on the:Read the answer and worked solution →The plant hormone that promotes cell division is:Read the answer and worked solution →The plant hormone that signals growth to stop, such as in wilting, is:Read the answer and worked solution →A student is startled by a loud noise and her heart races. The hormone released is:Read the answer and worked solution →Iodised salt is recommended because iodine lets the thyroid gland make:Read the answer and worked solution →A person lacking iodine may develop a swollen neck. This condition is:Read the answer and worked solution →A patient with diabetes is given injections of the hormone:Read the answer and worked solution →Catch the nerve partsRead the answer and worked solution →Pop the plant hormonesRead the answer and worked solution →Run the coordination gatesRead the answer and worked solution →Slice the hormonesRead the answer and worked solution →Animal or plantRead the answer and worked solution →Sort the control factsRead the answer and worked solution →Type the numberRead the answer and worked solution →Coordination bingoRead the answer and worked solution →

Worked practice questions

An electrical signal in a nerve cell starts at the dendrite and travels along the:

  1. Axon
  2. Bone
  3. Vein
  4. Skin
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Correct answer: A. Axon

1. The signal enters at the dendritic tip. 2. It crosses the cell body and runs down a long fibre. 3. That fibre is the axon. _Source: syllabus Science Class X, Chapter 7, Control and Coordination._

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The tiny gap between the end of one neuron and the next one is called a:

  1. Suture
  2. Synapse
  3. Sinuses
  4. Sockets
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Correct answer: B. Synapse

1. Signals must jump from one nerve cell to another. 2. They cross a small space to do it. 3. That space is the synapse. _Source: syllabus Science Class X, Chapter 7, Control and Coordination._

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The tissue built from a network of neurons and specialised for conducting signals is:

  1. Nervous tissue
  2. Muscular tissue
  3. Connective tissue
  4. Epithelial tissue
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Correct answer: A. Nervous tissue

1. Neurons are joined into a network. 2. Their job is to carry information quickly. 3. So it is nervous tissue. _Source: syllabus Science Class X, Chapter 7, Control and Coordination._

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