Chapter 1 — Support and Movement in Living Organisms · Biology. These are 10 questions from the Magmo3 bank on this lesson, from easy to hard. Solve each one, then open "Show answer and explanation". Magmo3 has 35 questions on this lesson, each with an explanation.
Which supporting tissue has living cells whose walls are thickened with cellulose at the corners?
Correct answer: (D) Collenchyma
Explanation: Collenchyma consists of living cells with walls thickened by cellulose, providing flexible support to young growing parts.
What do ligaments connect?
Correct answer: (C) Bone to bone
Explanation: Ligaments connect bone to bone at a joint, whereas tendons connect muscle to bone.
What is the longest and strongest bone in the human body?
Correct answer: (C) The femur
Explanation: The femur is the longest and strongest bone in the body and is located in the lower limb.
According to their shape, the wrist (carpal) bones are classified as?
Correct answer: (A) Short bones
Explanation: The wrist bones are short bones, with their length close to their width, providing stability with limited movement.
Support in the earthworm depends on?
Correct answer: (C) A hydrostatic skeleton (pressurized internal fluid)
Explanation: The earthworm has a soft body and relies on a hydrostatic skeleton; the pressure of the internal fluid gives the body its support and shape.
What type of joint is found between the first vertebra (the atlas) and the second vertebra (the axis)?
Correct answer: (B) Pivot joint
Explanation: The pivot joint between the atlas and the axis allows the head to rotate right and left.
What is the main function of red bone marrow?
Correct answer: (D) Forming blood cells
Explanation: Red bone marrow forms blood cells, whereas yellow bone marrow stores fat.
If the loss of calcium from the bones increases, the bones are expected to?
Correct answer: (D) Become weaker and more easily broken
Explanation: Bones store calcium, which contributes to their hardness; losing calcium makes them weak and more easily broken.
Counting the vertebrae of the vertebral column from the top, which statement correctly describes vertebra number 20?
Correct answer: (B) It is the first lumbar vertebra, and no rib articulates with it
Explanation: There are 7 cervical and 12 thoracic vertebrae, so vertebrae 1 to 19 are cervical and thoracic and vertebra 20 is the first lumbar vertebra. Ribs articulate only with the thoracic vertebrae, so no rib is attached to a lumbar vertebra.
Collenchyma is common in young growing stems and leaf stalks, while sclerenchyma is common in mature, fully grown parts. Which explanation best fits this distribution?
Correct answer: (B) Collenchyma has living cells with cellulose thickenings, giving support while allowing growth
Explanation: Collenchyma cells are living and their walls are thickened with cellulose at the corners, which is strong yet flexible and does not stop elongation. Sclerenchyma cells are dead with lignified walls, which give rigid support suited to parts that have finished growing.
The first 10 questions in every subject are free, each with an explanation.