WORKSHEET – CHAPTER 6: CONTROL AND COORDINATION

SECTION A – MULTIPLE CHOICE QUESTIONS (20 MCQs)

  1. Coordination in animals is controlled by:
     a) Nervous system
     b) Endocrine system
     c) Both a and b
     d) Skeletal system

  2. Functional unit of nervous system is:
     a) Nephron
     b) Neuron
     c) Alveolus
     d) Platelet

  3. Part responsible for thinking in brain is:
     a) Cerebellum
     b) Medulla
     c) Cerebrum
     d) Pons

  4. Balance and posture are controlled by:
     a) Cerebrum
     b) Cerebellum
     c) Medulla
     d) Hypothalamus

  5. Reflex actions are controlled by:
     a) Brain
     b) Spinal cord
     c) Cerebellum
     d) Pons

  6. Which hormone regulates sugar levels?
     a) Thyroxine
     b) Insulin
     c) Adrenaline
     d) Testosterone

  7. The gap between two neurons is called:
     a) Synapse
     b) Dendrite
     c) Axon
     d) Node

  8. A plant bends towards light because of:
     a) Hydrotropism
     b) Phototropism
     c) Thigmotropism
     d) Geotropism

  9. Growth of a plant root towards gravity is:
     a) Positive geotropism
     b) Negative geotropism
     c) Positive phototropism
     d) Thigmotropism

  10. Which gland is known as master gland?
     a) Pancreas
     b) Thyroid
     c) Adrenal
     d) Pituitary

  11. The hormone responsible for “fight or flight” response is:
     a) Thyroxine
     b) Insulin
     c) Adrenaline
     d) Estrogen

  12. Tropic movement occurs due to:
     a) Hormones
     b) Nerves
     c) Blood pressure
     d) Reflex

MCQs Based on NCERT Diagrams / Logic
  1. Communication between two neurons occurs through:
     a) Axon
     b) Neurotransmitters
     c) Nodes
     d) Myelin

  2. A person cannot maintain posture. Which part is damaged?
     a) Cerebrum
     b) Medulla
     c) Cerebellum
     d) Spinal cord

  3. In reflex action, the pathway is:
     a) Receptor → Brain → Effector
     b) Receptor → Spinal cord → Effector
     c) Brain → Spinal cord → Muscle
     d) Receptor → Muscle

Case-Based MCQs

Read the case and answer Q16–20:

A boy accidentally touches a hot plate and immediately removes his hand.

  1. This action is known as:
     a) Voluntary action
     b) Reflex action
     c) Hormonal response
     d) Tropism

  2. Reflex actions are:
     a) Slow
     b) Fast
     c) Thought-based
     d) Optional

  3. The organ responsible for this action is:
     a) Brain
     b) Heart
     c) Spinal cord
     d) Cornea

  4. The receptor involved is:
     a) Chemoreceptor
     b) Photoreceptor
     c) Pain receptor
     d) Thermoreceptor

  5. Response is carried to muscles by:
     a) Sensory neuron
     b) Motor neuron
     c) Synapse
     d) Gland

SECTION B – ASSERTION & REASON (10 Questions)

  1. A: Cerebrum controls thinking and intelligence.
     R: Cerebrum is the largest part of the brain.

  2. A: Reflex actions are involuntary.
     R: They are controlled by spinal cord.

  3. A: Adrenaline increases heartbeat and breathing rate.
     R: It prepares body for emergency.

  4. A: IAA (Auxin) controls phototropism.
     R: Auxin accumulates on the darker side of shoot.

  5. A: Glands release hormones directly into blood.
     R: Endocrine glands are ductless.

  6. A: Medulla controls involuntary actions.
     R: Medulla controls swallowing and heartbeat.

  7. A: Tropic movements are directional.
     R: They depend on direction of stimulus.

  8. A: Thyroid gland requires iodine.
     R: Iodine is needed for formation of thyroxine.

  9. A: Neurons carry messages in form of electrical signals.
     R: Signals travel through dendrites and axons.

  10. A: Pancreas secretes insulin.
     R: Insulin lowers blood sugar.

SECTION C – ONE-WORD / VERY SHORT ANSWERS (10)

  1. Define neuron.
  2. What is synapse?
  3. Name the hormone secreted by thyroid.
  4. What are tropic movements?
  5. State one function of cerebellum.
  6. What is a reflex arc?
  7. Name two plant hormones.
  8. What is hydrotropism?
  9. Name the endocrine gland present on kidneys.
  10. What is adrenaline?

SECTION D – SHORT ANSWER QUESTIONS (8)

  1. Draw a labelled diagram of a neuron.
  2. Explain reflex action with a diagram of reflex arc.
  3. Give differences between nervous control and hormonal control.
  4. Explain phototropism with an experiment.
  5. How does adrenaline help the body in emergency?
  6. Describe the functions of cerebrum, cerebellum, and medulla.
  7. What happens when thyroid gland is underactive?
  8. Explain chemical coordination in plants using auxin.

SECTION E – LONG ANSWER QUESTIONS (5)

Q1. (Case-Based – Nervous System)

A girl touches a hot pan and withdraws her hand instantly.

(a) Explain pathway of reflex arc.
 (b) Draw a neat diagram of reflex arc.
 (c) Why is reflex action faster than voluntary action?
 (d) How does reflex arc protect the body?

Q2. (Brain Structure – 5 Marks)

(a) Draw a labelled diagram of human brain.
 (b) Write the functions of:
     • Cerebrum
     • Cerebellum
     • Medulla
 (c) Why is brain protected by skull and cerebrospinal fluid?

Q3. (Endocrine System – 5 Marks)

(a) Explain hormonal coordination in humans.
 (b) Write functions of:
     • Thyroxine
     • Insulin
     • Adrenaline
 (c) What happens when insulin is not secreted in sufficient quantity?

Q4. (Plant Coordination – 5 Marks)

(a) Explain phototropism with experiment by Darwin or Went.
 (b) Describe geotropism and hydrotropism with diagrams.
 (c) Why are plant responses slower than animals?

Q5. (Full-Length Mixed Concept Question)

(a) What is coordination? Why do organisms need it?
 (b) Differentiate between voluntary, involuntary, and reflex actions with examples.
 (c) Explain neuron structure and its working.
 (d) Why do we need both nervous and endocrine systems?

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