Ch-10 Question 41 to 60

Respiration in Organisms

Sr NO.	Question	Answer
41.	Explain the cause of change in appearance in lime water when we blow on lime water solution.	When we blow, carbon dioxide is passed through lime water and calcium carbonate is formed thereby, which makes lime water milky.
42.	What is the standard test for the presence of carbon dioxide?	The turning of lime water into milky is a standard test for the presence of carbon dioxide.
43.	Why do we exhale? Do we exhale only carbon dioxide or a mixture of gases along with it?	Exhaled air is to expel unwanted gases from our body. We exhale a mixture of gases with 4.4% carbon dioxide.
44.	If you exhale on a mirror, a film of moisture appears on its surface. From where do these droplets come?	Exhaled air contains moisture, so a film of moisture on the surface of the glass formed when we exhale on a mirror.
45.	We take in air through our _______.	Nostrils.
46.	What is the percentage of oxygen and carbon dioxide in inhaled and exhaled air?	Category Gas Percentage Inhaled air Oxygen 21% Carbon dioxide 0.04% Exhaled air Oxygen 16.4% Carbon dioxide 4.4%
47.	How cock roach breathe?	Cockroach breathes with using small openings on the sides of its body.
48.	Where Lungs are present in our body?	Chest Cavity.
49.	Which is surrounded by Chest Cavity?	Ribs on the sides.
50.	A large,muscular sheet called ______ forms the floor of the chest cavity.	Diaphragm
51.	Breathing involves the movement of the ______ and the _______.	Diaphram and the rib cage
52.	How spiracles and tracheae enables insect to breathe?	Oxygen rich air rushes through spiracles into the tracheal tubes, diffuses into the body tissue, and reaches every cell of the body. Similarly, carbon dioxide from the cells goes into the tracheal tubes and moves out through spiracles.
53.	How earthworms breathe with their skin?	The skin of an earthworm feels moist and slimy on touching. Gases can easily pass through them.
54.	What is the peculiarity of breathing technique in frogs?	Frogs have a pair of lungs like human beings; they can also breathe through their skin, which is moist and slippery.
55.	There are many organisms which live in water. How do they breathe under water?	Gills in fish help them to use oxygen dissolved in water. Gills are projections of the skin. Gills are well supplied with blood vessels for exchange of gases.
56.	How gills help fish in breathing?	Gills are well supplied with blood vessels for exchange of gases.
57.	Whether roots, which are underground also, take in oxygen? If so, how?	Root cells also need oxygen to generate energy. Roots take up air from the air spaces present between the soils particles.
58.	________ damages lungs. ________ is also linked to cancer. ______ must be avoided.	Smoking
59.	How plants breathe?	They take in oxygen from the air and give out carbon dioxide. In the cells oxygen is used to break down glucose into carbon dioxide and water as in other organisms.
60.	What is the difference in the breathing method in plants against other animals?	In plants each part independently takes in oxygen from the air and give out carbon dioxide. The leaves of the plants have tiny pores called stomata for exchange of oxygen and carbon dioxide. In animals like humans only lungs performs the function.