Tag: circulatory system and organs

Questions Related to circulatory system and organs

Calcium and ............. gives rigidity to bones and teeth 

evs structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. Oxalate

  2. Pectate

  3. Carbonate

  4. Phosphate

  5. Sulphate

Show answer
Correct Option: D
Explanation:
Phosphorus is found within the skeleton and teeth, where it is compounded with calcium to form calcium phosphate.  It is a primarily component of hydroxyapatite crystals in bones and teeth, and help in rigidity to the softer portions. 
So the correct answer is D.

The number of teeth that grow twice in human life is 

evs structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. 4

  2. 12

  3. 20

  4. 28

Show answer
Correct Option: C
Explanation:

20 milk teeth of a child get replaced in adulthood by 20 permanent teeth. But the rest 12 can never be replaced if broken, these 12 teeth grow only once in a man’s life.
So, the correct option is '20'.

The primary dentition in human differs from permanent dentition in not having one of the following type of teeth

evs structure and functions of living organisms -ii role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

  1. Canine

  2. Premolars

  3. Molars

  4. Incisors

Show answer
Correct Option: B
Explanation:

There are 20 primary teeth which are lost as the child grows and is replaced by 32 permanent teeth. Primary dentition comprises of 8 incisors, 4 canines and 8 molars while permanent teeth comprises of 8 premolars in addition to newly formed 8 incisors, 4 canines and 12 molars. Premolars take the place of molars present in the primary dentition.

Consider the following statements each with two blanks.
(A) Seminiferous tubules produce (i) while Leydig's cells produce (ii).
(B) In females, urethra is small and conducts (iii) while in males it conducts urine and (iv).
(C) The process Of formation of spermatozoa from spermatogonia is called (v) and the process of maturation of spermatids into spermatozoa is called (vi).
Which one of the following options, gives the correct fill ups for the respective blank numbers from (i) to (vi) in the statements?

biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

  1. (i)-spermatozoa, (ii)-testosterone,

    (v)-spermatogenesis, (vi)-spermiogenesis

  2. (i)-testosterone, (ii)-spermatozoa, (iii)-urine, (iv)-semen

  3. (i)-estrogen, (ii)-testosterone, (v)-spermiogenesis, (vi)-spermatogenesis

  4. (iii)-urine, (iv)-semen, (v)-spermiogenesis, (vi)-spermatogenesis

Show answer
Correct Option: A
Explanation:

The seminiferous tubules are the location of the production of spermatozoa or sperms in the testicular lobule. The Leydig cells (interstitial cells) outside the seminiferous tubule synthesize and secrete testicular hormones called androgens or testosterone. Spermatogenesis is the process of immature male germ cells (spermatogonia) develop into mature sperms or spermatozoa. After this process, the conversion of the four equal haploid spermatids into spermatozoa (sperms) is called spermiogenesis. 

So, the correct option is '(i)-spermatozoa, (ii)-testosterone, (v)-spermatogenesis, (vi)-spermiogenesis'.

In frogs, body proportions do not change with their growth. A frog  that is twice as long as another will be  heavier by approximately ?

biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

  1. Two-fold

  2. Six-fold

  3. Four-fold

  4. Eight-fold

Show answer
Correct Option: A
Explanation:

In frogs, body proportions do not change with their growth. This means that the weight and height of a frog increase and decrease proportionately. If one of these parameters increase, so does the other, and by the same proportion, and vice-versa. Hence, if a frog is twice as long as another, it will be approximately two times heavier also.

So, the correct answer is 'Two-fold'.

The graph of electrical activity of heart versus time produced by non-invasive medical procedure is called 

biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

  1. Electro - cardiograph

  2. Electro - encephalograph

  3. Electro - cardiogram

  4. Electro - cardiography

Show answer
Correct Option: A
Explanation:

The graph of electrical activity of heart versus time produced by non-invasive medical procedure is called electrocardiograph. The process of recording the electrical activity of heart over a period of time is called as electrocardiography (ECG). The graph of electrical activity of brain versus time is called as electroencephalograph. The machine used to record the electrical activity of heart is called as electrocardiogram.

Thus, the correct answer is 'Electro - cardiograph.'

Match column I with column II and select the correct option from the codes given.

Column I Column II
A. Testis (i) Pigmentation
B. Ovaries (ii) Atrophies in adult
C. Thymus (iii) Estrogen
D. Melanin (iv) Testosterone
biology structure and functions of living organisms -ii role of receptors in the mouth types of teeth circulatory system and organs

  1. A-(iii), B-(iv), C-(i), D-(ii)

  2. A-(ii), B-(iii), C-(iv), D-(i)

  3. A-(iv), B-(iii), C-(ii), D-(i)

  4. A-(i), B-(iv), C-(ii), D-(iii)

Show answer
Correct Option: C
Explanation:
Testosterone is released from testis.
Estrogen is released by ovaries.
In the case of the thymus, the atrophy in an adult is observed.
Melanin is the reason for pigmentation.
So, the correct option is 'A-(iv), B-(iii), C-(ii), D-(I)'