Question: Which of the following is a uni-nucleated cell?

• 1. A smooth muscle cell.
• 2. A cardiac muscle cell.
• 3. A skeletal muscle cell.
• 4. All of these

Question: Rapid movement of leaves of mimosa on touching is an example of _____________?

• 1. Turgor movement
• 2. Nastic movement
• 3. Tropic movements.
• 4. Growth movement

Question: The contraction of which of the following muscle fibers, is controlled by hormones?

• 1. A smooth muscle
• 2. A cardiac muscle
• 3. A skeletal muscle.
• 4. All of these

Question: Roots of a plant show______________?

• 1. Positive phototropism and negative geotropism
• 2. Negative phototropism and positive geotropism
• 3. Negative tactic movement and positive tropic movement
• 4. Positive geotropism of stem and roots

Question: Why skeletal muscles are called striated muscles?

• 1. They appear darker than smooth muscles by naked eye.
• 2. Alternating dark and light bands appear on their surface when visualized by naked eye.
• 3. Alternating dark and light bands appear on their surface when visualized via a microscope.
• 4. All of these

Question: Epinasty is controlled by_____________?

• 1. Gibberellins
• 2. Abscisins
• 3. Auxins
• 4. Cytokinins

Question: Which of the following statements is incorrect about skeletal muscle fibers?

• 1. They are multinucleated.
• 2. They are 10 – 100 ?m in diameter & surrounded by sarcolemma
• 3. They contain O2 storing molecules called hemoglobin.
• 4. Their cytoplasm contains high concentration of carbohydrates

Question: Gibberellins is an example of_________________?

• 1. Growth inhibitor
• 2. Growth stimulator
• 3. Growth hormone
• 4. None of these

Question: A smallest contractile unit of muscle contraction called sarcomere is the area between two:

• 1. H- zone
• 2. M- Line
• 3. Z- Line
• 4. A band

Question: Which of the following animal has a hydrostatic skeleton?

• 1. Earthworm
• 2. Round worm
• 3. Tape worm
• 4. Pin worm