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Life Processes Test - 51

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Life Processes Test - 51
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Weekly Quiz Competition
  • Question 1
    1 / -0
    A storage organ is a part of a plant specifically modified for storage of energy generally in the form of
    Solution
    • A storage organ is a part of a plant modified for storage of energy (generally in the form of carbohydrates) or water. 
    • Storage organs often grow underground, where they are protected from attack by herbivores. 
    • Hence, A storage organ is a part of a plant modified for storage of energy generally in the form of Carbohydrates.
    • So, the correct answer is 'Carbohydrates'.
  • Question 2
    1 / -0
    Food synthesized in the leaves is transported to other parts by
    Solution
    Translocation is the movement of organic nutrients from the region of source or supply to the region of sink or utilisation. Phloem is the pathway for this translocation.
  • Question 3
    1 / -0
    Transport of food material in plants takes place through: 
    Solution

    • The transport of soluble products of photosynthesis is called translocation and it occurs in the part of the vascular tissue known as phloem.
    • Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.
    • Sieve tubes: Transport sugars and nutrients up and down the plants in sieve cells.
    • Companion cells: Controls the activity of the sieve tube. 
    • Phloem parenchyma: Provides mechanical strength to the plant. 
    • Phloem fibres: Stores compounds such as starch.
    So, the correct answer is option B.

  • Question 4
    1 / -0
    The shade of the tree is often cooler than exposed atmosphere, because of:
    Solution
    Transpiration is the process of loss of water from a plant in vapour form. One of the benefits of transpiration is that it causes surface cooling because evaporation of water requires energy. Consumption of energy leads to a cooling effect on the leaf surface. Also because of more water vapor content in shade, a tree shade is cooler than an area exposed to sunlight. 
    Thus the correct answer is option C. 
  • Question 5
    1 / -0
    Difference between diastole and systole pressure is 
    Solution
    Pulse pressure is the difference between the systolic and diastolic pressure readings. It is measured in millimeters of mercury (mmHg). It represents the force that the heart generates each time it contracts. If resting blood pressure is (systolic/diastolic) 120/80 millimeters of mercury (mmHg), pulse pressure is 40.
  • Question 6
    1 / -0
    Translocation of food is:
    Solution
    • The translocation of water and minerals in the xylary elements is always unidirectional, i.e., in the upward direction, from roots to aerial parts. 
    • The driving force for transport in xylary elements is transpiration. 
    • The translocation of organic solutes in phloem is bidirectional. 
    • The transport of prepared food is from source to sink. 
    • Wherever sugars are present in higher concentrations, from there, sugars will be transported to a region, where sugars are required or need to be stored.
    Thus, the correct answer is option C. 
  • Question 7
    1 / -0
    The surface area of a human lung is made larger by alveoli and is approximately the size of a:
    Solution
    The lungs are large, paired, spongy organs present in the thoracic (chest) cavity. The right lung is divided into three lobes, the left lung into two lobes. Because the lung consists largely of air tubes and elastic tissue, it is a spongy, elastic organ with a very large internal surface area for gas exchange. Inside the lungs the bronchi branch, becoming smaller and more in number. These branches give rise to more than 1 million tiny bronchioles in each lung. Each bronchiole ends in a cluster of tiny air sacs, the alveoli. Each human lung contains more than 300 million alveoli, which provide an internal surface area the approximate size of a tennis court. Each alveolus is lined by an extremely thin, single layer of epithelial cells.
    Hence, the correct answer is 'D'.
  • Question 8
    1 / -0
    Which chamber/s of the heart carry oxygenated blood?
    Solution
    The right side of the heart consists of the right atrium and the right ventricle. The right side of the heart carries the deoxygenated blood received from all parts of the body. The left side of the heart always carries oxygenated blood because it receives pure blood from the pulmonary veins. 
    So, the correct answer is option C.
  • Question 9
    1 / -0
    Which of the following is found more in lymph than in blood?
    Solution
    Lymph carries digested and absorbed fats from the intestine. Therefore, lymph carries more fats than in blood. Lymph does not contain RBCs and hence, no haemoglobin.
    So, the correct answer is option C.
  • Question 10
    1 / -0
    The internal lining of blood vessels is called:
    Solution
    The internal lining of blood vessels is called the endothelium, which is the thin layer of simple squamous cells, that lines the interior surface of blood vessels and lymphatic vessels. The cells that form the endothelium are called endothelial cells. These cells are in direct contact with blood and are called vascular endothelial cells, whereas those in direct contact with lymph are known as lymphatic endothelial cells.
    So, the correct option is B.
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