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Mosquito and human health - class-VIII

Description: mosquito and human health
Number of Questions: 23
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Tags: our health, diseases and prevention a treat for mosquito health and hygiene evs biology hygiene and prevention of diseases
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Mosquito larva breathes through

  1. Spiracles

  2. Siphon

  3. Lungs

  4. Spiracles & siphon


Correct Option: A

Which of the following is an important component of haemoglobin?

  1. Iron

  2. Sodium

  3. Calcium

  4. None


Correct Option: A
Explanation:

Iron is an important component of hemoglobin which is present in red blood cells. It carries oxygen from lungs to different parts of the body. Sources of iron includes sunflower seeds, nuts, beef, beans, green leafy vegetables, tofu, amla, jaggery. Iron deficiency can leads to anemia, that is low number of hemoglobin as there is insufficient iron in the body to produce enough of hemoglobin.

Thus, the correct answer is option A.

Anemia is occurred due to 

  1. Iron deficiencies

  2. Zinc deficiencies

  3. Potassium deficiencies

  4. None of the above


Correct Option: A
Explanation:
  • Anemia is a condition in which the blood doesn't have enough healthy red blood cells or hemoglobin.
  • Iron is the major component in the formation of Haemoglobin. Hence deficiency of iron results in iron deficiency anemia.
  • Hence Anemia is occurred due to Iron deficiencies.
  • So, the correct answer is 'Iron deficiencies'.

Anaemia is caused due to deficiency of.

  1. Calcium

  2. Magnesium

  3. Iron

  4. Iodine


Correct Option: C

Anemia can be diagnosed by 

  1. Blood count

  2. Blood pressure

  3. Fever

  4. None of the above


Correct Option: A

What is the role of iron in blood?

  1. It helps to transport oxygen.

  2. It helps transport nutrients.

  3. It gives the red colour to the blood.

  4. All of the above.


Correct Option: A
Explanation:

  •  Iron is an essential element for blood production. 
  • About 70 per cent of your body's iron is found in the red blood cells of your blood called haemoglobin and in muscle cells called myoglobin.
  •  Haemoglobin is essential for transferring oxygen in your blood from the lungs to the tissues. Hence, the role of iron in the blood is that it helps to transport oxygen. 
So, the correct answer is 'It helps to transport oxygen'.

Which of the following helps to cure anaemia?

  1. Jaggery

  2. Amla

  3. Green vegetables

  4. All of the above


Correct Option: D
Explanation:
  • Anaemia is a condition in which the blood doesn't have enough healthy red blood cells. 
  • The major causes are iron deficiency (low-level iron) anaemia and thalassemia (inherited disorders of haemoglobin).  
  • Iron-rich foods include peanuts, jaggery chikkis, almonds, walnuts, soy nuts and raisins, amla and green vegetables helps to prevent anaemia. 
  • Hence, jaggery, amla and green vegetables help to cure anaemia. 
  • So, the correct answer is 'all the above'.

Identify the symptoms of anaemia.

  1. Headache

  2. Weakness

  3. Loss of appetite

  4. All of the above


Correct Option: B
Explanation:
  • Anaemia is a condition in which the blood doesn't have enough healthy red blood cells. 
  • The major causes are iron deficiency (low-level iron) anaemia and thalassemia (inherited disorders of haemoglobin).  
  • Symptoms of anaemia: pale skin., fatigue., weakness., tiring easily., breathlessness, drop in blood pressure when standing from a sitting or lying position (orthostatic hypotension) this may happen after acute blood loss, like a heavy period., frequent headaches.
  •  Hence, the symptoms of anaemia are a weakness.
  • So, the correct answer is 'Weakness'.

Examination of blood of a person suspected of having anaemia shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following is likely to alleviate his symptoms?

  1. Iron compounds

  2. Thiamine

  3. Folic acid and cobalamine

  4. Riboflavin


Correct Option: A

Complete blood count test provides us with

  1. Information about the cell

  2. An overview of patient's health status

  3. Both A and B

  4. None of the above


Correct Option: C
Explanation:

A complete blood count (CBC) is a test panel requested by a doctor or other medical professional that gives information about the cells in a patient's blood. It is the most commonly performed blood tests in medicine, as they can provide an overview of a patient's general health status. 

Therefore, the correct answer is option C.

Anaemia is a common health problem especially in women. Which one of the following deficiencies is most frequently responsible for anaemia in India?

  1. Calcium

  2. Iron

  3. Iodine

  4. Zinc


Correct Option: B

Identify the vitamin which helps to cure anaemia.

  1. Vitamin A

  2. Vitamin B12

  3. Vitamin K

  4. Vitamin E


Correct Option: B
Explanation:

  • Vitamin B-12 is a water-soluble vitamin, like all other B-vitamins. This means it can dissolve in water and travel through the bloodstream. 
  • The human body can store vitamin B-12 for up to four years. Any excess or unwanted vitamin B-12 is excreted in the urine. 
  • The human body produces millions of red blood cells every minute. These cells cannot multiply properly without vitamin B-12. The production of red blood cells reduces if vitamin B-12 levels are too low. Anaemia can occur if the red blood cell count drops. Hence, Vitamin B12 helps to cure anaemia. 
 So, the correct answer is 'Vitamin B12'.

Which of the following is a source of iron?

  1. Green vegetables

  2. Amla

  3. Jaggery

  4. All of the above


Correct Option: D
Explanation:

Iron is an important component of hemoglobin. It carries oxygen from lungs to different parts of the body. Sources of iron includes sunflower seeds, nuts, beef, beans, green leafy vegetables, tofu, amla, jaggery. Iron deficiency can leads to anemia. 

Thus, the correct answer is option D.

Assertion    : Blood sugar level falls rapidly after
                      hepatedomy.

Reason     :  The glycogen of the liver is the principal
                     source of blood sugar.

  1. If both the assertion and the reason are true and the reason

    is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is

    not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true


Correct Option: A
Explanation:

In liver , glycogen a reserve food material is changed  into glucose (glycogenolysis ) and released into blood.  Under abnormal condition ,liver can convert proteins and fats into glucose by complex chemical reactions i.e., called gluconeogenesis. Thus, due to hepatectomy blood sugar level falls rapidly.

There is less iron in the blood of the person suffering from anaemia.

  1. True

  2. False


Correct Option: A
Explanation:
  • Anaemia is a decrease in the total amount of red blood cells (RBCs) or haemoglobin in the blood or a lowered ability of the blood to carry oxygen.
  • When anaemia comes on slowly, the symptoms may include feeling tired, weakness, shortness of breath or a poor ability to exercise. Hence, There is less iron in the blood of the person suffers from anaemia. 
So, the correct answer is 'true'.

Pernicious anaemia is caused by

  1. Low RBC count

  2. Death of WBC

  3. Obstruction of RBC maturation

  4. Destruction of young RBC.


Correct Option: C

The reduced flow of oxygen in blood occurs in

  1. Malaria

  2. Anaemia

  3. Cancer

  4. Typhoid


Correct Option: B
Explanation:

  • Anaemia is a decrease in the total amount of red blood cells (RBCs) or haemoglobin in the blood or a lowered ability of the blood to carry oxygen.
  • When anaemia comes on slowly, the symptoms may include feeling tired, weakness, shortness of breath or a poor ability to exercise. Hence, The reduced flow of oxygen in the blood occurs in Anaemia
 So, the correct answer is 'Anaemia'.

Green leafy vegetables are a rich source of ________.

  1. Sodium

  2. Iron

  3. Magnesium

  4. None of the above


Correct Option: B
Explanation:

Iron is an important component of hemoglobin which is a part of red blood cells. It carries oxygen from lungs to different parts of the body. Green leafy vegetables such as spinach are rich sources of iron. Other foods containing iron include sunflower seeds, nuts, beef, beans, tofu, amla, jaggery. Iron deficiency can leads to anemia. 

Thus, the correct answer is option B.

Anaemia can be diagnosed by the

  1. Shape and size of RBC only

  2. Number of platelets only

  3. Size and shape of WBC only

  4. Number of WBC only


Correct Option: A
Explanation:

  •  To diagnose anaemia, your doctor may ask you about your medical and family history, perform a physical exam, and run the following tests: Complete blood count (CBC) or Red cell distribution width (RDW).
  •   A CBC is used to count the number of blood cells in a sample of your blood.
  • Red cell distribution width (RDW) is also the test to diagnose anaemia. For instance, you'll probably have greater differences in red blood cell size if you have anaemia in these test.
  • Hence, Anaemia can be diagnosed by the shape and size of RBC only.
  • So, the correct answer is 'Shape and size of RBC only'.

Vegetables are good source of iron.

  1. True

  2. False


Correct Option: A
Explanation:
  • Vegetables are parts of plants that are consumed by humans or other animals as food. For example, spinach.
  • Leafy greens, such as spinach, kale, swiss chard, collard, and beet greens contain between 2.5–6.4 mg of iron per cooked cup.
  • For example, 100 grams of spinach contains 1.1 times more iron than the same amount of red meat and 2.2 times more than 100 grams of salmon (26, 27).
  • Hence Vegetables are a good source of iron is a true statement.

Choose the correct answer from the alternatives given.
Fehlings reagent is used for testing:

  1. Reducing sugars

  2. Non-reducing sugars

  3. Stereoisomerism

  4. Asymmetry of carbon atoms


Correct Option: A
Explanation:

Fehling's reagent is a chemical reagent used to differentiate between water-soluble carbohydrates and ketone functional groups. This reagent is used for testing the presence of reducing sugars. Reducing sugars give a positive result to this test due to the presence of oxidisable aldehyde group.

Non-reducing sugars like sucrose can be tested by Tollen's reagent.
So, the correct option is 'Reducing sugars'.

Hepatitis is caused due to consumption of ________.

  1. Alcohol

  2. Contaminated water

  3. Antibiotics

  4. None of the above


Correct Option: B
Explanation:

Hepatitis is sometimes caused due to excessive consumption of alcohol. This results to liver cirrhosis. This is called a non-viral hepatitis.

Anaemia is caused due to 

  1. Shortage of blood

  2. Shortage of bones

  3. Increase in the amount of blood

  4. None of the above


Correct Option: A
Explanation:

Anaemia is a condition in which is there is shortage of blood or shortage of red blood cells. It results due to loss of blood during accident or pregnancy. It can also results due to insufficient iron in the body to produce enough of haemoglobin.

Thus, the correct answer is option A.

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