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Life Processes Test - 80

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Life Processes Test - 80
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Weekly Quiz Competition
  • Question 1
    1 / -0
    In veins, valves are present to check backward flow of blood flowing at: 
    Solution

    The veins (except pulmonary veins) carry deoxygenated blood from the tissues back to the heart. The blood flows in the veins at very low pressure. This flow of blood at low pressure increases the possibility of the blood flowing backwards. The presence of valves in the veins prevents the blood flowing at low pressure from flowing backwards.

    Thus, the correct answer is 'Low pressure.'

  • Question 2
    1 / -0
    Dental caries is due to
    Solution
    Dental caries, which are also referred to as tooth decay or cavities, are one of the most common and widespread persistent diseases today and are also one of the most preventable. When we eat certain foods, the bacteria on the teeth break them down and produce acids that have the ability to seriously damage the hard tissues of the tooth. The result is the formation of dental caries (cavities). 
    So, the correct option is 'B" (Bacterial Infections).
  • Question 3
    1 / -0
    Which of the following statements is correct regarding veins?
    Solution
    The veins carry deoxygenated blood from the tissues back to the heart. There is an exception, the pulmonary vein carries oxygenated blood from the lungs to the heart. However, all veins carry blood from some organ to the heart.
    Thus, the correct answer is option A.
  • Question 4
    1 / -0
    The salivary glands produce saliva. What is the function of saliva?
    Solution
    • Saliva is a thick, colourless and glistening liquid with about 98 percent water in our mouth. The saliva contains chemicals like mucus, salts, antibacterial substances, and enzymes that help in the digestion of food especially starch.
    • The digestion of starch into sugar is done in the mouth because of an enzyme, salivary amylase that the saliva contains.
    • Saliva also helps to make the food into a bolus structure. For the ease of transport into the stomach.
    So, the correct answer is A.
  • Question 5
    1 / -0
    Which of the following is NOT a physical process of digestion?
    Solution
    (A) Mastication is the process of chewing food in the mouth.
    (B) Churning is the process in which the stomach mixes its digestive enzyme with food.
    (C) Peristalsis is a wave-like muscle contraction that helps in the movement of food through organs like the oesophagus. 
    (D) Emulsification is the process of mixing bile with fat to change it into micelles. Emulsification is a chemical process.
    So, the correct option is D.
  • Question 6
    1 / -0
    The irregular shape of Amoeba is attributed by the presence of 
    Solution
    Pseudopodia is the characteristic of amoeba is also known as false feet as that is the temporary projection of cell wall that helps amoeba in locomotion as well as it captures the food for it.
    So, the correct option is 'Pseudopodia'.
  • Question 7
    1 / -0
    All animals mostly fall in the category of  _________________.
    Solution
    Heterotrophs are animals that depend directly or indirectly on autotrophs.  They are categorized into consumers (primary, secondary and tertiary), detrivores and decomposers.
    Autotrophs are the green plants or producers that convert light energy into chemical energy and prepare their own food by the process of photosynthesis.
    Hence, all animals mostly fall in the category of heterotrophs.
    So, the correct answer is 'Heterotrophs'.
  • Question 8
    1 / -0
    Which one of the following options has correct terms for (a), (b), and (c) for the given diagram mentioned:

    Solution
    Correct option: A 

    Explanation:
    • In human respiratory system, Inspired air enters from nostrils to nasal cavity followed by larynx and trachea. From trachea air enters into primary bronchi which divides into each lung and further into secondary bronchi and tertiary bronchi.
    • From tertiary bronchioles, air passes inside the lungs through branch like tree limbs called bronchi. Tiny air sac like structure called alveoli are present at the ends of bronchi which helps in exchange of gases.
    • For the given diagram-
    a = Bronchioles
    b = Alveolar sac
    c = Tertiary bronchus
    Therefore, Option A is correct.
  • Question 9
    1 / -0
    What are P, Q, R, S in the given figure?

    Solution
    The components marked in the figure are: 
    P:  Right Ventricle
    Q: Left ventricle
    R:  Right atrium
    S:  Left atrium
    De-oxygenated (poor oxygen content) blood from the body was collected in the right atrium and it was pumped into the right ventricle and it was pumped into the lungs. Lungs purify the blood by oxygenating it and it is pumped back into the left atrium. Oxygenated blood received in the left atrium is then pumped into the left ventricle, which pumps it back to the body. 
  • Question 10
    1 / -0
    Which of the following part/s of the human digestive system involves both chemical and mechanical ways of digestion?
    Solution
    A) Oesophagus:-It is a long tube-like structure that leads food from mouth to stomach by peristalsis movement of muscles.
    B) Stomach:- It is the digestive part which is J shaped and store food for around 4-5 hours and churns the food with churning movement along with it gastric acid and pepsin are mixed with the food which helps in the digestion of protein.
    C) Mouth:-It is the first part of the digestive tract where food is broken down into a paste by teeth and digestion of starch starts here with the help of the enzyme salivary amylase.
    So the correct option is 'Both B and C'.
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