EXCRETION VII SCIENCE PRACTICE QUESTIONS

KENDRIYA VIDYALAYA ,BARRACKPORE (AFS) STD-VII,SUB-SCIENCE, CHAPTER EXCRETION

Name _________________________________                                   Period _______

1.Define excretion?

2.Write the difference between excretion  and egestion on the basis of the  substance given out and organ involved.

3. Write the names of different organs and substances in excretion in human being.

4. How and where these waste materials are produced in the body.

5. Why these waste materials should be removed from the body.

6. Write the names of the organs of urinary/excretory organs.

7. Cell                     metabolism             waste          Diffusion              Blood capillary             Artery

 

                                                                   Useful substances                                                       nephrone         capillary                                                                    

                                                              Absorbed& harmful given out

Write this flow chart in your own words.

8. label the diagram and write the functions

9.How much urine is produced daily.

10. What is the composition of urine.

11. What are  the functions  of sweat in our body.

12. What is the composition of sweat.

13. What is the excretory material of birds,fishes and human.

14. What a person can do if  his kidney fails.

15. How does skin control body temperature?
16..  The lungs excrete ________________________ and _____________________ by the process of __________________________ and ____________________________.                                                                                                               17.  Name the organs of the human urinary system.

18.  Describe the pathway of excretion through the urinary tract.

19.  What is the function of the kidney?  How can humans live with only one kidney?
20.  How does the size of the liver compare to the other organs in the body?
21.  State three functions of the liver.

22.The muscular tube through which stored urine is passed out of the body is called –

(a) kidney  (b) ureter (c) urethra  (d) urinary bladder

23. They are pipe-like, consisting of a group of specialised cells. They transport substances and form a two-way traffic in plants. Which of the following terms qualify for the features mentioned above?

(a) Xylem tissue  (b) Vascular tissue (c) Root hairs (d) Phloem tissue

24. In which of the following parts of human body are sweat  glands  absent?

(a) Scalp (b) Armpits (c) Lips (d) Palms

25. In a tall tree, which force is responsible for pulling water and minerals from the soil?

(a) Gravitational force  (b) Transportation force  (c) Suction force (d) Conduction force

26. Aquatic animals like fish excrete their wastes in gaseous form as

(a) Oxygen  (b) Hydrogen  (c) Ammonia  (d) Nitrogen

#Can you just imagine, the entire blood content of human body gets filtered and purified within just 45 minutes? #  In the period of 24 hours, your blood has to pass through the kidneys as many as 300 times!