Co-ordination and Secretion

1. Which of the following is a gaseous phytohormone produced by fleshy fruits during ripening?

• A) Auxin
• B) Gibberellin
• C) Ethylene
• D) Florigen

2. What is the primary biological reason that nerve cells (neurons) cannot divide?

• A) They lack a nucleus.
• B) They do not have a cell membrane.
• C) They have no centriole.
• D) Their axon is too long.

3. In a reflex action, what is the correct pathway for a nerve impulse after a receptor is stimulated?

• A) Motor nerve -> Spinal cord -> Sensory nerve -> Effector organ
• B) Effector organ -> Motor nerve -> Spinal cord -> Sensory nerve
• C) Sensory nerve -> Spinal cord -> Motor nerve -> Effector organ
• D) Spinal cord -> Sensory nerve -> Effector organ -> Motor nerve

4. What is the junction between two neurons that allows information to pass from one to another called?

• A) Axon
• B) Dendrite
• C) Synapse
• D) Cell body

5. What is the key structural difference between the grey matter and white matter in the cerebrum?

• A) Grey matter is for protection, while white matter is for thinking.
• B) Grey matter contains nerve cell bodies, while white matter is composed of nerve fibres (axons).
• C) Grey matter is white in colour, and white matter is grey in colour.
• D) Grey matter is found only in the hindbrain, while white matter is in the forebrain.

6. What is the expected effect of applying Gibberellin to a dwarf plant?

• A) It will inhibit the process of fruit abscission.
• B) It will induce adventitious roots in its stem.
• C) It will grow in height due to internode elongation.
• D) It will ripen its fruits prematurely.

7. Who first discovered the hormone Auxin by observing the effect of light on a plumule?

• A) Gregor Mendel
• B) Charles Darwin
• C) Louis Pasteur
• D) Robert Hooke