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Class 10 Science Life processes Test-paper




In this page we have Class 10 Science Life processes Test-paper . Hope you like them and do not forget to like , social shar and comment at the end of the page.
Question 1 What are peristaltic movements?

Answer

The contraction and expansion movements of the walls of food-pipe are called peristaltic movements. This movement pushes the food in forward direction in the alimentary cana


Question 2How is the small intestine designed to absorb digested food?

Answer

The small intestine is the main region for the absorption of digested food. The inner lining of small intestine has millions of tiny finger-like projections called villi. The presence of villi gives the inner walls of the small intestine a very large surface area for absorption of digested food. The villi are richly supplied with blood vessels which take the absorbed food to each and every cell of the body.


Question 3Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

Answer

ammals and birds are warm-blooded animals. They constantly use energy to maintain their body temperature. They have higher energy need and so they require more oxygen to produce energy. Thus, it is important that their oxygenated blood does not get mixed up with deoxygenated blood.


Question 4 What are the components of the transport system in highly organized plants?

Answer

The components of the transport system of highly organized plants consist of xylemand phloem. Xylem consists of tracheids, vessels, xylem parenchyma and xylem fibres. Phloem consists of sieve tubes, companion cells, phloem fibres and phloem parenchyma.


Question 5 How are the alveoli designed to maximize the exchange of gases?

Answer

Thus a large amount of air is brought in contact with the air in the lungs. More than millions of alveoli are present in the lungs. The presence of millions of alveoli in the lungs provides a very large surface area for the exchange of gases. The availability of large surface area maximizes the exchange of gases.


Question 6What is ascent sap?

Answer

Absorbed water from the soil also contains dissolved minerals (nitrates, phosphates, etc) and hence it is called sap. This sap moves upwards due to the transpiration pull’developed in the xylem elements. Thus, transportation of sap from roots to the leaves at the top is called ascent of sap.


Question 7What is transpiration pull?

Answer

Water in the mesophyll cells of leaves (cells located below the stomata) is in contact with water or sap in xylem of leaf petiole, stem and root. This water evaporates by the process of transpiration. Thus, due to transpiration water is pulled upward which creates an upward suction force called ‘transpiration pull’.



Question 8 What are the differences between the transport of materials in xylem and phlowem?

Answer

Class 10 Science Life processes Test paper


Question 9 Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.

Answer

Class 10 Science Life processes Test paper
 



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