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Life Processes Test - 88

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Life Processes Test - 88
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  • Question 1
    1 / -0
    Respiration and photosynthesis are
    Solution
    Respiration is catabolic while photosynthesis is an anabolic process. In respiration, glucose is broken down into water and carbon dioxide (and energy). In contrast carbon dioxide and water combine in the presence of sunlight to produce glucose and oxygen during photosynthesis. Carbon dioxide is absorbed and oxygen is released in photosynthesis which is exactly opposite to what happens in respiration where oxygen is absorbed and carbon dioxide is released. So the answer is- opposite process.
  • Question 2
    1 / -0
    In normal blood pressure 120/80 the denominator  indicates ........... pressure.
    Solution
    Systolic pressure is peak pressure in the arteries, which occurs near the end of the cardiac cycle when the ventricles are contracting. Diastolic pressure is minimum pressure in the arteries, which occurs near the beginning of the cardiac cycle when the ventricles are filled with blood. The diastolic blood pressure number or the bottom number indicates the pressure in the arteries when the heart rests between beats. A normal systolic blood pressure is 120 or below. A normal diastolic blood pressure number is 80 or below.
    So, the correct answer is option B.
  • Question 3
    1 / -0

    Directions For Questions

    Plants produce a number of waste products during their life processes. As compared to animals, plants produce waste products very slowly and in very small amounts. The plants have no special organs for waste removal like the animals.
    The plants remove their waste products by different methods. The main waste products by plants are carbon dioxide, water, vapor and oxygen. Carbon dioxide and water vapor are     produced as wastes during respiration by plants whereas oxygen is produced as waste during photosynthesis. The gaseous wastes of respiration and photosynthesis in plants (carbon dioxide, water vapor and oxygen) are removed through the 'stomata' in leaves and 'lenticles' in stems and released to the air. The plants excrete carbon dioxide produced as a waste during respiration only at night time. This is because all the carbon dioxide produced during respiration in daytime is used up by the plant itself in photosynthesis. The plants excrete oxygen as waste only during the daytime (because oxygen is produced by photosynthesis only during the daytime when there is sunlight). Water vapor produced as a waste by respiration is, however, excreted by plants all the time (day as well as night). This waste water is excreted out by transpiration.
               The plants also store some of the waste products in their body parts. For example, some of the waste products collect in the leaves, bark and ripe fruits fall off from a tree, thus the waste products contained in them are excreted. Some of the plant waste gets stored in the fruits of the plant in the form of solid bodies called raphides. These wastes are removed when the fruit gets detached from the plant. For example, the fruit called 'yam' (zamikand) has needle-shaped raphides on its surface. The plants secrete their wastes in the form of gum and resins from their stems and branches. The plants also excrete some waste substances into the soil around them.

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    What is raphides?
  • Question 4
    1 / -0
    The salivary glands secrete 
  • Question 5
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    Which of the following gases makes the most stable combination with the haemoglobin of red blood cells? 
    Solution
    • The combination of oxygen with haemoglobin is called oxyhaemoglobin and this oxygenated blood is carried away from the lungs through the bloodstream to all the tissues of the body. 
    • Carbon monoxide can also bind to haemoglobin but does so about 240 times more tightly than oxygen, forming a compound called carboxyhaemoglobin. 
    • This means that if both carbon monoxide and oxygen are inhaled, carbon monoxide will preferentially bind to haemoglobin. 
    • This reduces the amount of haemoglobin available to bind to oxygen, so the body and tissues become starved of oxygen.
  • Question 6
    1 / -0
    Which of the following is not a characteristic of good respiratory surface?
    Solution
    The characteristics of a respiratory surface are thin walls, a moist inner surface, a huge combined surface area, a rich blood supply each alveolus is sounded by capillaries. Surfaces which dries out easily, thick and easily damaged are not a characteristic of good respiratory surface. 
    Therefore, the correct answer is option D.
  • Question 7
    1 / -0
    The part of digestive system where no digestion occurs is:
    Solution
    • Digestion refers to the process where the food consumed by us is processed and broken down into smaller parts that can be absorbed by the body. 
    • Of all the parts of the digestive system, the connecting link from the mouth to the stomach is the oesophagus. It is a muscular tube that moves the partially digested food from mouth to the stomach for further digestion. 
    • Hence,  the oesophagus is the part of the digestive system where no digestion occurs. 
    Therefore, the correct answer is option B.
  • Question 8
    1 / -0
    When the right ventricle in the human heart contracts, the blood moves to:
    Solution
    • The deoxygenated blood first enters the heart into the right atrium. 
    • Blood passes from the right atrium through the tricuspid valve into the right ventricle. 
    • When the right ventricle contracts, the muscular force pushes blood through the pulmonary semilunar valve into the pulmonary artery.
    So, the correct answer is 'Pulmonary artery'.
  • Question 9
    1 / -0
    Mammals are said to have double circulation, it means
    Solution
    Double circulation (double circulatory systems) are circulation systems in which blood flows through the heart twice. In the case of double circulation, pulmonary circulation - i.e., blood flow between the heart and lungs, is separate from systemic circulation - i.e., movement of blood from the heart through the rest of the body (excluding the lungs), then back to the heart. During one complete cycle of flow through the whole body (blood system), blood in a double circulatory system passes through the heart twice.
    So, the correct answer is option D.
  • Question 10
    1 / -0
    Which one of the following helps in the upward movement of water and dissolved minerals from the roots to the leaves through the stem ?
    Solution
    The continuous evaporation of water (or transpiration) from the cells of a leaf crates a kind of suction which pulls up water through the xylem vessles. Thus, transpiration helps in the upward movement of water and dissolved minerals from the roots to the leaves through the stem.
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