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The Fundamental Unit of Life Test - 22

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The Fundamental Unit of Life Test - 22
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following statements is true about the nucleus of a cell?
    Solution
    The nucleus is the largest and most significant living organelle of the cell. All the cellular activities of the cell are regulated by the nucleus. Hence it is called brain or control centre of the cell. The nucleus is surrounded by a double unit membrane from all sites. The chromosomes and genes which have genetical characters and transmit from one generation to another are found in the nucleus. Thus option D is the correct answer. 
  • Question 2
    1 / -0
    Which one of the following is not a part of nucleus?
    Solution
    Centrosome is a small body located near the nucleus. It has a dense center and radiating tubules. During cell division (mitosis), the centrosome divides and the two parts move to opposite sides of the dividing cell and produce microtubules.
    Hence the correct option is C.
  • Question 3
    1 / -0
    Nucleus is surrounded by a 
    Solution
    In eukaryotic organisms, the nucleus has five parts - nuclear envelope, nucleoplasm, nuclear matrix, chromatin, and nucleolus. The nuclear envelope is also called as karyotheca. It is made up of two membranes, the outer membrane may have ribosomes and interconnections with the ER and the inner membrane is connected with the nucleoplasm.
    Hence the correct option is B.
  • Question 4
    1 / -0
    Gaseous exchange in cells takes place by___________
    Solution
    Diffusion is a process where the molecules move from region of higher concentration to the lower concentration. It is a passive process, which always takes place towards the diffusion gradient. It plays an integral role in the exchange of gases at the cellular level. For example, the oxygenated blood in the arteries releases the oxygen to the extracellular fluid and further to the cells with an exchange of carbon dioxide. This takes place due to the diffusion gradient created by the high concentration of oxygen in the blood as compared to the cell.
  • Question 5
    1 / -0
    Which of the following cell organelles is found only in plant?
    Solution
    Plastids are characteristic organelles of plants only. Plants are autotrophic and show the process of photosynthesis due to the presence of green coloured plastids called chloroplasts. Colourless plastids called leucoplasts store food materials like starch, proteins and fats and non-green coloured plastids called chromoplasts are important for pollination and dispersal of fruits.
  • Question 6
    1 / -0
    An organism in which all the activities are performed by a single cell is called:
    Solution
    An organism that performs and exhibits all functions of life via a single cell, it is a unicellular organism. Such as prokaryotes like bacteria, eukaryotes like yeast are unicellular organisms. They lack a group of cells (tissue) or organ systems to perform specific functions. All the cellular functions for it to be living are performed by the individual cell.  So, the correct answer is 'Unicellular'.
  • Question 7
    1 / -0
    The largest cell measuring 170 mm × 150 mm is the egg of ___________.
    Solution
    The egg of an ostrich is the largest cell, with dimensions of 170 mm $$\times$$ 150 mm and weighs about 1.3 kgs. It has a cell volume of about 1.1 $$\times$$ 10$$^{15}$$ $$\mu$$m$$^3$$.
    So, the correct answer is option C.
  • Question 8
    1 / -0
    The organism made up of only a single cell is known as 
    Solution
    The cell is the structural unit of life. Unicellular organisms are made up of one cell that performs all the functions and thus, called as a single-celled organism.
  • Question 9
    1 / -0
    Which of these is a plastid?
    Solution
    The chloroplast is an example of plastid which can self-replicate and multiply in numbers. They are present in the plant cells and are involved in special functions. The chloroplast contains the chlorophyll pigments which can capture the light energy and perform photosynthesis. 
    Thus, the correct answer is option C. 
  • Question 10
    1 / -0
    Each organ is further made up of smaller parts called __________.
    Solution
    • Each organ is further made up of smaller parts called tissues. A tissue is a group of similar cells performing a specific function.
    • Cells are the basic building blocks of living things. 
    • Pseudopodia is a retractile process of the cytoplasm of a cell that functions especially as an organ of locomotion and food-acquiring.
    So, the correct option is A.
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