Biology Today - February 2018

1. The vertebral formula of humans is
   (a) C 7 T 12 L 5 S(5)C(4) (b) C(7)T 12 L 4 S(5)C(5)
   (c) C 5 T 10 L 8 S(6)C(4) (d) C 5 T 10 L 6 S(8)C(4).


2. Which of the statements given below are incorrect?
   I. The first seven pairs of ribs are attached to sternum by
   hyaline cartilage.
   II. The tip of sternum is known as manubrium.
   III. Pubic symphysis is made up of white fibrous cartilage.
   IV. A saddle joint is monaxial joint.
   (a) I and II only (b) I, II and III only
   (c) II, III and IV only (d) II and IV only


3. Match column I with column II and select the correct option.
   Column I Column II
   A. Conn’s syndrome (i) Excess of parathormone
   B. Gull’s disease (ii) Excess of cortisol
   C. Osteoporosis (iii) Excess of aldosterone
   D. Cushing’s syndrome (iv) Deficiency of thyroid
   hormone
   (a) A-(iii), B-(i), C-(iv), D-(ii)
   (b) A-(iii), B-(iv), C-(i), D-(ii)
   (c) A-(iv), B-(iii), C-(ii), D-(i)
   (d) A-(iv), B-(i), C-(iii), D-(ii)


4. Select the mismatched pair from the following options.
   (a) Ruffini’s corpuscles – Thermoreceptors
   (b) Meissner’s corpuscles – Tangoreceptors
   (c) Trochlear nerve – Longest cranial nerve
   (d) Hypoglossal nerve – Motor nerve


5. Refer to the given diagram showing various skin receptors.

Skin surface

D

C

A

B

Total Marks : 160 Time Taken : 40 Min.

T

his specially designed column enables students to self analyse their

extent of understanding of specified chapters. Give yourself four

marks for correct answer and deduct one mark for wrong answer.

Self check table given at the end will help you to check your

readiness.

-10 Practice Problems Class XI

• Locomotion and Movement


• Neural Control and Coordination


• Chemical Coordination and Integration

The receptors which respond to strong pressure is labelled as

(a) A (b) B (c) C (d) D.

6. Modified sweat glands at the edge of the eyelids are
   (a) glands of Zeis (b) lacrimal glands
   (c) glands of Moll (d) tarsal glands.


7. Observe the given diagram of vertical section of a human
   eye. The area which is devoid of rods and blood vessels but
   has cone cells only is depicted as

I

IV

III

II

(a) I (b) II (c) III (d) IV.

8. Alzheimer’s disease is caused due to
   (a) destruction of neurons of the basal ganglia
   (b) destruction of neurons in the hippocampus
   (c) degeneration of the lenticular nucleus
   (d) damage to the portions of the thalamus and
   hypothalamus of the brain.


9. Read the given statements and select the correct option.
   Statement A : Auditory function of ear is restricted only
   to external and middle ear.
   Statement B : Internal ear bears cochlea which is responsible
   for maintenance of balance of the body and posture.
   (a) Both statements A and B are correct and statement B
   is the correct explanation of statement A.