Biology
Study the following diagram carefully and then answer the questions that follow:
(a) Name the cell labelled 1.
(b) Identify the phenomenon occurring in A.
(c) Mention two structural differences between 1 and 2.
(d) Name the process occurring in B and C and state the importance of this process in the human body.
Answer
(a) The cell labelled 1 is a Red blood cell.
(b) Phenomenon occurring in A is Diapedesis.
(c) Two structural differences between red blood cells and white blood cells are:
| Red Blood Cells | White Blood Cells |
|---|---|
| Red blood cells are minute biconcave disc-like structures. | White blood cells are amoeboid and can produce pseudopodia with which they can squeeze through the walls of the capillaries into the tissues. |
| Red blood cells lack nucleus. | White blood cells have a nucleus. |
(d) The process which occurs in B and C is phagocytosis. In this process, the WBCs engulf the foreign particles and destroy them, thus preventing the occurrence of disease.
Related Questions
The figures given below show diagrammatic cross-sections of three kinds of blood vessels.
(a) Identify the blood vessels A, B and C.
(b) Name the parts labeled 1-4.
(c) Mention two structural differences between A and B.
(d) Name the kinds of blood that flow through A and through B respectively.
(e) In which one of the vessels referred to in (a) above does the exchange of gases actually take place?
Given diagram is a schematic representation of the circulatory system in humans. Study the same and answer the questions that follow :
(a) Label the parts 1 and 4 indicated in the diagram.
(b) Which of the above mentioned number is the thickest artery? Also write its name.
(c) Mention the number and chamber of the heart which has the thickest muscular wall.
(d) Which of the above numbers/structures has the maximum number of blood capillaries?
(e) Draw neat and labelled diagrams of the transverse section of vena cava and the part numbered as 3. Make sure to show the structural differences between these two in the diagram.
Given alongside are diagrams of a certain category of blood vessels showing the role of a special structure in their walls. Study the figure and answer the questions that follow.
(a) Name the kind of blood vessels shown in the figure. What are its branches termed as ?
(b) Name the structure shown inside the blood vessels. Write its important role.
(c) What kind of blood flows through these blood vessels normally? Name the blood vessel which carries blood from the heart to the lungs.
(d) Name a similar kind of blood vessel which is related to the liver and kidney.
(e) Draw a neat and labelled diagram of the transverse section of the blood vessel shown above showing the three layers of its wall and lumen.
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the questions that follow:
(a) Name the phase.
(b) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(c) Name the parts numbered 1 to 6.
(d) What type of blood flows through the parts marked '1' and '2' respectively?
(e) How many valves are closed in this phase?