NEET CONCEPT TEST -6 | BIOLOGY | STD 11 | CHAPTER -20

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Instruction

• Total 15 question
• Total  Marks 60
• Each Question 4 marks
• Negative marking -1 for each wrong Question

NEET CONCEPT TEST - 6 | BIOLOGY | STD 11  | CHAPTER -20

1. Osteoporosis , decreased bone mass in old age is due to
( a ) decreased Ca2 + uptake ( b ) high concentration of TCT
( c ) decreased concentration of estrogen in females ( d ) inflammation of joints ,

2. Which statements are correct regarding skeletal muscles ?
A. Their activities are under the voluntary control of the nervous system .
B. They are located in the inner walls of visceral organs .
C. They are primarily involved in locomotory actions and changes of body postures .
D. They have no striped appearance .
( a ) B.D ( b ) B , C ( c ) A, D ( d ) A , C

3. Which of the following sarcomeres is labelled correctly ?

4. Skeletal muscles appear striated due to presence of two characteristic proteins in alternating dark and light bands . Which of the following is a correct match of the protein with its light refractive property and colour ?
         Protein       Colour       Property
( a ) Myosin         Light       Anisotropic
( b ) Actin             Dark       Anisotropic
( c )Myosin          Dark         Isotropic
( d ) Actin            Light         Isotropic

5. Surgical removal of which of the following endocrine glands will maximally upset calcium levels in the blood of man ?
( a ) Parathyroid   ( b ) Adrenal medulla   ( c ) Thyroid ( d ) Pancreas

6. Which of the following statements is not true ?
( a ) The secretion of hormones by the anterior pituitary is controlled by hypothalamic releasing hormones .
( b ) The pituitary is attached to the hypothalamus by the infundibulum .
( c ) Hypophyseal portal veins connect the posterior pituitary to the hypothalamus .
( d ) The anterior pituitary constitutes the majority of the pituitary gland .

7. Pacinian corpuscles respond to
( a ) pressure   ( b ) light   ( c ) temperature   ( d ) taste .

8. Which of the following is responsible for myosin heads detaching from actin ?

( a ) Sodium ions    ( b ) Acetylcholine   ( c ) Calcium ions  ( d ) ATP

9. A thin layer of hyaline cartilage covering the region of the epiphysis that is involved in forming a joint with another bone is called the
( a ) epiphyseal cartilage    ( b ) articular cartilage 
( c ) meniscus                      ( d ) periosteum .

10. Suppose the terminal ends of axon are in contact with the dendrites of five adjacent neurons , the nerve impulse of the axon will
( a ) travel in all the five neurons  
( b ) get distributed in all the five neurons resulting in a weak response
( c ) travel only in one neuron which is in closest connect and with the same intensity
( d ) travel in none of the neurons because the impulse travels from dendrites of one neuron into the axon of another neuron .

11. Go through the following table comparing the effects of parasympathetic and sympathetic nervous system . Which one is matched correctly ? 

      Features                           Parasymphathetic        Symphathnervous system
                                                 nervous system  
( a ) Pupil of the eye             Dilates                                  Constricts
( b ) Heart rate                      Decreases                            Increases
( c ) Intestinal peristalsis    Inhibit                                   Stimulate
        movement
( d ) Salivary gland               Inhibits Stimulate           salivation salivation

12. When a neuron shows a stable resulting potential , the concentration of Nat is

( a ) 10 times higher inside the cell than outside
( b ) 10 times higher outside the cell than inside
( c ) 30 times higher inside the cell than outside
( d ) 30 times higher outside the cell than inside .

13. Match column with column II and select the correct option .
        Column I                             Column II
A. Parkinson's disease     ( i ) Decreased production of acetylcholine
B. Epilepsy                         ( ii ) Degeneration of dopamine releasing neurons
C Alzheimer's disease     ( iii ) Degeneration of neurons on the cerebral cortex
D. Huntington's chorea    ( iv ) Irregular electrical discharge in neurons
( a ) A - ( ii ) , B- ( iv ) , C - ( i ) , D- ( iii ) ( b ) A- ( iv ) , B- ( ii ) , C- ( iii ) , D - ( i )
( c ) A - ( ii ) , B- , ( i )   C - ( iii ) ,D- ( iv ) ( d ) A - ( ii ) , B- ( iii ) , C- ( iv ) , D - ( l )

14. Which of the following are the functions of thyroxine and triiodothyronine ?

( i ) They help in metamorphosis of tadpole into adult larva .
( ii ) They increase the action of neurotransmitters like adrenaline and noradrenaline .
( iii ) They regulate the development of mental faculties .
( a ) ( i ) and ( iii )   ( b ) ( i ) and ( ii )    ( c ) ( ii ) and ( iii )   ( d ) ( i ), ( ii) and ( iii )

15 . converts short time memory into long time remembrance
( a ) Reticular system   ( b ) Hippocampus 
( c )Pons varolli             ( d ) Medulla oblongata

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ANSWER KEY

1. ( c ) 2. ( d ) 3. ( a ) 4 . ( d ) 5 . ( a ) 6. ( c ) 7. ( a ) 8. ( d ) 9 . ( b ) ) 10. ( a ) 11. ( b ) 12. ( d ) 13. ( a ) 14. ( d ) 15. ( b )

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