Control and Coordination
Subject: General Science
Sample Practice Questions
Question 1: Where are reflex arcs formed?
- Brain
- Spinal cord
- Muscles
- Sensory organs
Explanation: Reflex arcs are formed in the spinal cord itself. The text states: 'Reflex arcs are formed in this spinal cord itself, although the information input also goes on to reach the brain.'
Question 2: What is the central nervous system composed of?
- Brain and spinal cord
- Nerves and muscles
- Sensory and motor neurons
- Cranial and spinal nerves
Explanation: The central nervous system consists of the brain and spinal cord. The peripheral nervous system consists of cranial and spinal nerves connecting the CNS to other parts of the body.
Question 3: What happens when a nerve impulse reaches a muscle?
- The muscle relaxes
- The muscle contracts
- The muscle stops functioning
- The muscle grows longer
Explanation: When a nerve impulse reaches a muscle, the muscle fibres move by changing their shape to shorten. This leads to muscle contraction.
Question 4: Which part of the brain is the main thinking part?
- Mid-brain
- Hind-brain
- Fore-brain
- Cerebellum
Explanation: The fore-brain is the main thinking part of the brain. It has regions that receive sensory impulses, interpret information, and make decisions about how to respond.
Question 5: What is the response of plant roots to gravity called?
- Phototropism
- Geotropism
- Hydrotropism
- Chemotropism
Explanation: Geotropism is the growth movement in response to gravity. Roots grow downwards (positive geotropism) while shoots grow upwards (negative geotropism).
Question 6: What is the response of plant roots to water called?
- Phototropism
- Geotropism
- Hydrotropism
- Chemotropism
Explanation: Hydrotropism is the directional growth of plants in response to water. Roots grow towards water (positive hydrotropism), which helps them absorb water from the soil.
Question 7: What is the basic unit of the nervous system?
- Nephron
- Neuron
- Axon
- Dendrite
Explanation: The neuron is the basic structural and functional unit of the nervous system. It is a specialized cell that transmits information via electrical impulses.
Question 8: What is the response of plants to light called?
- Geotropism
- Hydrotropism
- Phototropism
- Chemotropism
Explanation: Phototropism is the directional growth of plants in response to light. Shoots bend towards light (positive phototropism) while roots bend away from light.
Question 9: What is the growth of pollen tubes towards ovules an example of?
- Phototropism
- Geotropism
- Hydrotropism
- Chemotropism
Explanation: Chemotropism is the directional growth in response to chemicals. The growth of pollen tubes towards ovules is an example of chemotropism.
Question 10: What is the function of thyroxin?
- Regulates blood sugar level
- Regulates growth and development
- Regulates carbohydrate, protein, and fat metabolism
- Controls the menstrual cycle
Explanation: Thyroxin regulates carbohydrate, protein, and fat metabolism in the body to provide the best balance for growth. Iodine is essential for the synthesis of thyroxin.