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Tamil Nadu Board 11th Standard Zoology - Unit 10: Book Back Answers and Solutions
This post covers the book back answers and solutions for Unit 10 – Zoology from the Tamil Nadu State Board 11th Standard Zoology textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Zoology Unit 10 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 11 students! Prepare well and aim for top scores. Thank you!
Unit 10 : Neural Control And Coordination
I. Multiple Choice Questions
1. Which structure in the ear converts pressure waves to action potentials?
a. Tympanic membrane
b. Organ of Corti
c. Oval window
d. Semicircular canal
Answer Key:
c. Oval window
2. Which of the following pairings is correct?
a. Sensory nerve - afferent
b. Motor nerve - afferent
c. Sensory nerve ventral
d. Motor nerve – dorsal
Answer Key:
a. Sensory nerve - afferent
3. During synaptic transmission of nerve impulse, neurotransmitter (P) is released from synaptic vesicles by the action of ions (Q). Choose the correct P and Q.
a. P = Acetylcholine, Q= Ca ++
b. P = Acetylcholine, Q= Na +
c. P = GABA, Q= Na +
d. P = Cholinesterase, Q= Ca ++.
Answer Key:
a. P = Acetylcholine, Q= Ca ++
4. Examine the diagram of the two cell types A and B given below and select the correct option
a. Tympanic membrane
b. Organ of Corti
c. Oval window
d. Semicircular canal
Answer Key:
c. Oval window
2. Which of the following pairings is correct?
a. Sensory nerve - afferent
b. Motor nerve - afferent
c. Sensory nerve ventral
d. Motor nerve – dorsal
Answer Key:
a. Sensory nerve - afferent
3. During synaptic transmission of nerve impulse, neurotransmitter (P) is released from synaptic vesicles by the action of ions (Q). Choose the correct P and Q.
a. P = Acetylcholine, Q= Ca ++
b. P = Acetylcholine, Q= Na +
c. P = GABA, Q= Na +
d. P = Cholinesterase, Q= Ca ++.
Answer Key:
a. P = Acetylcholine, Q= Ca ++
4. Examine the diagram of the two cell types A and B given below and select the correct option
a. Cell-A is the rod cell found evenly all over retina
b. Cell-A is the cone cell more concentrated in the fovea centralis
c. Cell-B is concerned with colour vision in bright light
d. Cell-A is sensitive to bright light intensities
Answer Key:
c. Cell-B is concerned with colour vision in bright light
5.Assertion The imbalance in concentration of Na+, K+ and proteins generates action potential
Reason: To maintain the unequal distribution of Na+ and K+, the neurons use electrical energy.
a. Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
b. Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
c. Assertion is true, but Reason is false.
d. Both Assertion and Reason are false.
Answer Key:
a. Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
6. Which part of the human brain is concerned with the regulation of body temperature?
a. Cerebellum
b. Cerebrum
c. Medulla oblongata
d. Hypothalamus
Answer Key:
d. Hypothalamus
7. The respiratory centre is present in the
a. Medulla oblongata
b. Hypothalamus
c. Cerebellum
d. Thalamus
Answer Key:
a. Medulla oblongata
8. Match the following human spinal nerves in column I with their respective number in column II and choose the correct option
column I column II
P. Cervical nerves i. 5 pairs
Q. Thoracic nerve ii. 1 pair
R. Lumbar nerve iii. 12 pair
S. Coccygeal nerve iv. 8 pair
a. (P-iv), (Q-iii), (R-i), (S-ii)
b. (P-iii), (Q-i), (R-ii), (S-iv)
c. (P-iv), (Q-i), (R-ii), (S-iii)
d. (P-ii), (Q-iv), (R-i), (S-iii)
Answer Key:
a. (P-iv), (Q-iii), (R-i), (S-ii)
9. The abundant intracellular cation is
a. H+
b. K +
c. N a+
d. Ca++
Answer Key:
b. K +
10. Which of the following statements is wrong regarding conduction of nerve impulse?
a. In a resting neuron, the axonal membrane is more permeable to K+ ions and nearly impermeable to Na ions.
b. Fluid outside the axon has a high concentration of Na ions and low concentration of K, in a resting neuron.
c. Ionic gradient s are maintained by Na K pumps across the resting membrane, which transport 3Na jons outwards for 2K+ into the cell.
d. A neuron is polarized only when the outer surface of the axonal membrane possess a negative a charge and its inner surface is positively charged.
Answer Key:
a. In a resting neuron, the axonal membrane is more permeable to K+ ions and nearly impermeable to Na ions.
11. All of the following are associated with the myeline sheath except
a. Faster conduction of nerve impulses
b. Nodes of Ranvier forming gaps along the axon
c. Increased energy output for nerve impulse conduction
d. Saltatory conduction of action potential
Answer Key:
c. Increased energy output for nerve impulse conduction
12. Several statements are given here in reference to cone cells which of the following option indicates all correct statements for cone cells?
Statements
(i) Cone cells are less sensitive in bright light than Rod cells
(ii) They are responsible for colour vision
(iii) Erythropsin is a photo pigment which is sensitive to red colour light
(iv) They are present in fovea of retina
a. (iii), (ii) and (i)
b. (ii), (iii) and (iv)
c. (i), (iii) and (iv)
d. (i), (ii) and (iv)
Answer Key:
b. (ii), (iii) and (iv)
13. Which of the following statement concerning the somatic division of the peripheral neural system is incorrect?
a. Its pathways innervate skeletal muscles
b. Its pathways are usually voluntary
c. Some of its pathways are referred to as reflex arcs
d. Its pathways always involve four neurons
Answer Key:
d. Its pathways always involve four neurons
14. When the potential across the axon membrane is more negative than the normal resting potential, the neuron is said to be in a state of
a. Depolarization
b. Hyperpolarization
c. Repolarization
d. Hypopolarization
Answer Key:
c. Repolarization
d. Cell-A is sensitive to bright light intensities
Answer Key:
c. Cell-B is concerned with colour vision in bright light
5.Assertion The imbalance in concentration of Na+, K+ and proteins generates action potential
Reason: To maintain the unequal distribution of Na+ and K+, the neurons use electrical energy.
a. Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
b. Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
c. Assertion is true, but Reason is false.
d. Both Assertion and Reason are false.
Answer Key:
a. Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
6. Which part of the human brain is concerned with the regulation of body temperature?
a. Cerebellum
b. Cerebrum
c. Medulla oblongata
d. Hypothalamus
Answer Key:
d. Hypothalamus
7. The respiratory centre is present in the
a. Medulla oblongata
b. Hypothalamus
c. Cerebellum
d. Thalamus
Answer Key:
a. Medulla oblongata
8. Match the following human spinal nerves in column I with their respective number in column II and choose the correct option
column I column II
P. Cervical nerves i. 5 pairs
Q. Thoracic nerve ii. 1 pair
R. Lumbar nerve iii. 12 pair
S. Coccygeal nerve iv. 8 pair
a. (P-iv), (Q-iii), (R-i), (S-ii)
b. (P-iii), (Q-i), (R-ii), (S-iv)
c. (P-iv), (Q-i), (R-ii), (S-iii)
d. (P-ii), (Q-iv), (R-i), (S-iii)
Answer Key:
a. (P-iv), (Q-iii), (R-i), (S-ii)
9. The abundant intracellular cation is
a. H+
b. K +
c. N a+
d. Ca++
Answer Key:
b. K +
10. Which of the following statements is wrong regarding conduction of nerve impulse?
a. In a resting neuron, the axonal membrane is more permeable to K+ ions and nearly impermeable to Na ions.
b. Fluid outside the axon has a high concentration of Na ions and low concentration of K, in a resting neuron.
c. Ionic gradient s are maintained by Na K pumps across the resting membrane, which transport 3Na jons outwards for 2K+ into the cell.
d. A neuron is polarized only when the outer surface of the axonal membrane possess a negative a charge and its inner surface is positively charged.
Answer Key:
a. In a resting neuron, the axonal membrane is more permeable to K+ ions and nearly impermeable to Na ions.
11. All of the following are associated with the myeline sheath except
a. Faster conduction of nerve impulses
b. Nodes of Ranvier forming gaps along the axon
c. Increased energy output for nerve impulse conduction
d. Saltatory conduction of action potential
Answer Key:
c. Increased energy output for nerve impulse conduction
12. Several statements are given here in reference to cone cells which of the following option indicates all correct statements for cone cells?
Statements
(i) Cone cells are less sensitive in bright light than Rod cells
(ii) They are responsible for colour vision
(iii) Erythropsin is a photo pigment which is sensitive to red colour light
(iv) They are present in fovea of retina
a. (iii), (ii) and (i)
b. (ii), (iii) and (iv)
c. (i), (iii) and (iv)
d. (i), (ii) and (iv)
Answer Key:
b. (ii), (iii) and (iv)
13. Which of the following statement concerning the somatic division of the peripheral neural system is incorrect?
a. Its pathways innervate skeletal muscles
b. Its pathways are usually voluntary
c. Some of its pathways are referred to as reflex arcs
d. Its pathways always involve four neurons
Answer Key:
d. Its pathways always involve four neurons
14. When the potential across the axon membrane is more negative than the normal resting potential, the neuron is said to be in a state of
a. Depolarization
b. Hyperpolarization
c. Repolarization
d. Hypopolarization
Answer Key:
c. Repolarization
II. Short answer questions
aIII. Long answer questions
aIV. Exercise
a
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