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प्रश्न
“All plants give out oxygen during the day and carbon dioxide during the night”. Do you agree with this statement? Give a reason.
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उत्तर
The statement is incorrect since plants respire and expel carbon dioxide at all times,but they only give out oxygen during the day because photosynthesis can only occur in the presence of sunlight.
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संबंधित प्रश्न
Describe the structure of nephrons.
What are the methods used by plants to get rid of excretory products?
The diagram given below shows a section of human kidney. Study the diagram carefully and answer the questions that follow :
(i) Label the parts numbered 1 to 4.
(ii) Why does part ‘2’ have a striped appearance?
(iii) What is the fluid that passes down part ‘4’? Name the main nitrogenous waste present in it.
(iv) Mention the structural and functional units of kidneys.
(v) Name the two major steps in the formation of the fluid mentioned in Q.5 (a) (iii).
The diagram given below is that of a structure present in a human kidney.
Study the same and answer the questions that follow:
1) Name the structure represented in the diagram
2) What is the liquid entering part ‘1’ called?
Name two substances present in this liquid that are reabsorbed in the tubule.
3) What is the fluid that comes to part ‘2’ called?
Name the main nitrogenous waste in it.
4) Mention the three main steps involved in the formation of the fluid mentioned in (iii) above
5) Name the substance which may be present in the fluid in part ‘2’ if a person suffers from Diabetes mellitus.
What do kidneys excrete?
What are the methods used by plants to get rid of their waste products?
The organs A of a person have been damaged completely due to which too much of a poisonous waste material B has started accumulating in his blood, making it dirty. In order to save this person's life, the blood from an artery in the person's arm is made to flow into long tubes made of substance E which are kept in coiled form in a tank containing solution F. This solution contains three materials G, H and I in similar proportions to those in normal blood. As the person's blood passes through long tubes of substance E, most of the wastes present in it go into solution. The clean blood is then put back into a vein in the arm of the person for circulation.
(a) What are organs A?
(b) Name the waste substance B.
(c) What are (i) E, and (ii) F?
(d) Name G, H and I.
(e) What is the process described above known as?
Write True (T) or False (F) for the following statement. Rewrite the false statement in the correct form.
Excess sugar in the blood is a symptom of diabetes.
Answer the following in short.
Define transpiration in plants.
Name the following:
The tuft of capillaries inside the Bowman's capsule.
Write down the functional activity of the following parts,
Henle's loop ………………
Differentiate between the following pairs of terms:
Bowman’s capsule and malpighian capsule.
Differentiate between the following pairs of term :
Renal pelvis and renal papilla
The following diagram represents a mammalian kidney tubule (nephron) and its blood supply.
Parts indicated by the guidelines 1 to 8 are as follows:
1. Afferent arteriole from renal artery
2. efferent arteriole
3. Bowman’s capsule
4. Glomerulus;
5. Proximal convoluted tubule with blood capillaries;
6. Distal convoluted tubule with blood capillaries;
7. collecting tubule;
8. U-shaped loop of Henle
Study the diagram and answer the question that follow:
Where does ultrafiltration take place?
Complete the following sentence with appropriate word:
The sum total of all the chemical reactions taking place in the cell is known as ______.
Write the functional activity of the following structure: Aldosterone
Write the functional activity of the following structure: Kidney
Elimination of nitrogenous wastes in the form of uric acid takes place in ____________.
Give two examples of the following:
Bile pigments
Name the following;
Three nitrogenous wastes of our body.
