Page 115 - Science Class 07

Exercise
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A. Tick (3) the correct op on.
1. Which of the following is not an animal waste?
(a) Carbon dioxide (b) Oxygen
(c) Urea (d) Uric acid
2. Which of the following is not an organ of urinary system?
(a) Aorta (b) Urinary bladder

(c) Kidney (d) Pancreas
3. Frequent discharge of urine is the symptom of:
(a) diabetes (b) asthma
(c) typhoid (d) none of these

4. Which of the following organisms excretes wastes through the process of diffusion?
(a) Cockroach (b) Earthworm
(c) Amoeba (d) Rabbit

5. Which of the following organs helps fishes in excre on?
(a) Gills (b) Fins
(c) Mouth (d) None of these
B. Fill in the blanks.

1. Cellulose is a ______________ substances.
2. Expulsion of faecal wastes out of the body is called ______________ .
3. Nitrogenous wastes come out of the body in the form of ______________ and
______________.
4. The waste products are sent to ______________ through ureter for storage.

5. During dialysis, ______________ from the arm is allowed to flow into the dialysing
machine.

6. In insects, the excretory system cons tutes a bunch of long tubules called
______________ tubules.
C. Write True or False.
1. Oxygen (O₂) we breathe in is converted into carbon dioxide (CO₂) a er releasing
energy from the food.
2. Undigested food is stored in the large intes ne of the human body.
3. Protein metabolim results in nitrogenous wastes.

4. Kidney failure may cause death of the vic m.
5. Marine fish lose water through the skin and take salt by diffusion.
D. Very short answer ques ons.

1. What is eges on?
2. What do urine and sweat mainly contain?
3. What is exhala on?

Science-7 115