Explain Activity 6.7 NCERT class 10 science Life processes

Activity 6.7 NCERT class 10 science chapter 6 Life processes

Brief procedure:

Activity 6.7 asks us to visit a local health centre, find the normal range of haemoglobin; and compare the difference in values between male and female. The activity also wants to see haemoglobin value in other animals.

Observation:

Haemoglobin range varies with age and sex

Children of age 6 to 12 yrs – 11.5 to 15.5 g/dl

Adult females – 12.1 to 15.1 g/dl

Adult males – 13.6 to 17.7 g/dl

Calves: average 10.5

Cow: male 8-12 female 10 to 15

Buffalo: Male 12.5 to 14.5 Female 11.5 to 13.5

Explanation:

Haemoglobin is an iron-containing red pigment present in red blood cells. It transports oxygen from the lungs to the tissues. A person with lesser haemoglobin looks pale with low energy. Spinach, beetroot, beans and lentils are the rich sources of iron.
 

Activity 6.7 NCERT class 10 science
Red blood corpuscles appear red due to the presence of Haemoglobin.
Cause of Regional variation:

Haemoglobin varies from place to place and depends on the environmental condition. If there is low oxygen concentration in the air, then there is higher haemoglobin content. For example, people going to high altitude gets more haemoglobin value in 2 to 3 month.

The different value in males vs females:

Differences in male and female are sought to be due to hormonal influences. It does not cause any side-effect in them.

The significance of Haemoglobin value:

Haemoglobin content acts as a marker of good health. The lower range indicates Anemia and malnutrition.

Next: Experiment to demonstrate transpiration. Activity 6.8.
Next: Activity 6.6: Why fish breath faster than man.

More details at MedlinePlus article

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