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RESPIRATION Question 1 Why do aquatic animals breath at a faster rate them terristial animals? Answer The amount of dissolved O2 in H2O is farely low compared to the amount of O2 in air. Question 2 Lungs always contain a residual volume of air? Answer Lungs always containers a residual volume of air to provide sufficient O2 to be absorbed and CO2 to be released. Question 3 How are lungs designed in Human Body to maximize the area for exchange of gases? Answer There are millions of alveoli present in the lungs. These alveoli provide a very area for the exchange of gases. Question 4 How are alveoli designed in Human Body to maximize the exchange of gases? Answer The extensive network of capalllaiesn [blood vessels] present in the walls of alveoli helps in easy diffusion ie. exchange of gases and provide large surface area for exchange of gases.
TRANSPORTATION Question 1 Difference between arteries & veins? Answer
Arteries are thick walled.
They do not have thick walls.
They have no valves.
They have valves.
They carry oxygenated blood except pulmonary artery.
They carry deoxygenated blood except pulmonary vein.
Question 2 Which mechanism plays a important role in transportation of water?
i. During Day time
ii. During Night Answer
Root pressure Question 3 What is translocation? Answer Transportation of soluble products of photosynthesis or food from leaves to other part of plant is called translocation.
Question 4 Give reason why the separatice of right & left side of heart is useful to keep oxygenated and deoxygenated blood from mixing. Answer Such sepration allows a highly sufficient supply of CO2 to the blood, this is highly useful in animal that have high energy need, such as birds & mammals which use energy constantly to maintain their body temperature. Question 5 How is the process of transportation is useful to plants? Answer It helps in upward movement of sap or water from roots to leaves.
*it regulates temperature.
*under the optimum conditions leaf can transpire it’s own weight of water in one hour. Question 6 What would be the consequences of deficiency of hemoglobin in our body? Answer Deficiency of hemoglobin will seriously effect of supply of O2 to the cells causing anemia. Question 7. How excretion occur in plants? Answer
Excretion in plants
The main waste product produced by plants are CO2 and O2 and water vapours. The plants also store some of waste product in their body parts. Some of the plant wastes get stored in the fruits of the plant in the form of social bodies called Raphides. For eg. The fruit called yam [jamikand] has needle shape raphides on its surface.
The variour method used by plants to get rid of their waste product are:
I. Gaseous waste through stomata in leaves & lenticels in stems.
II. The plant get rid of stored solid & liquid wastage by sheding of leaves, peeling of Bark and falling of fruits.
III. The plants get rid of waste by secreting in the form of gums & rasins.
IV. Plants also excreate some waste substances into the soil around them.