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Cell The Unit of Life Test - 39

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Cell The Unit of Life Test - 39
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  • Question 1
    1 / -0
    The transportation of materials in the cell is done by
    Solution
    Endoplasmic reticulum (ER) is a tube-like structure present in the cell, which extends all over the cell. The ER facilities transport of materials from one part of the cell to another, thus, forming the cell's circulatory system.
    So, the correct answer is option D.
  • Question 2
    1 / -0
    Percentage of water left in the soil when a plant begins to wilt is known as
    Solution
    Water held tightly by soil particles around them is called as hygroscopic water. It is held in a very thin film and is not available to plants. Plants are able to absorb capillary water, which is present in the capillary spaces between soil particles. Run away water is also not available to plants. 
    Field capacity denotes total water content in a field including hygroscopic water, capillary water and chemically bound water. 
    The percentage of water left in soil when plants begin to wilt is called as wilting coefficient. At wilting coefficient soil contains hygroscopic and chemically bound water.
    So, the correct answer is 'Wilting coefficient'
  • Question 3
    1 / -0
    Wilting of plant is present in
    Solution
    Passive absorption of water under the influence of transpiration pull is responsible for ascent of sap in higher plants. The transpiration loss of water occurs through stomata in leaves of higher plants. If theres is more water loss during transpiration than can be absorbed from soil, the plant shows wilting and leaves and other aerial parts droop down. 
    Algae do not show this type of water movement as they are aquatic thallophyte plants and have well developed vascular tissue. 
    Fern and mosses are bryophytes, which also do not have well developed sporophyte distinguished into root, stem and leaves. Well developed vascular system is absent in thallophytes and bryophytes. 
    Gymnosperms are the first plant group having well developed vascular system and show ascent of sap due to transpiration from leaves. In case transpiration is more than absorption; they show wilting.
  • Question 4
    1 / -0
    At which pH enzymes of lysosomes are usually active?
    Solution
    Lysosomes are single membrane-bound minute sacs of hydrolytic enzymes. Enzymes of lysosomes are usually active at an acidic pH. Hence they are also called acid hydrolases. The acidic pH is actively maintained in the lumen of lysosomes with the help of special proton pumps.
    So, the correct answer is 'pH 5'.
  • Question 5
    1 / -0
    Genetic material of prokaryotic cell is 
    Solution
    The nuclear region of a prokaryotic cell is poorly-defined because of the absence of a nuclear membrane. Hence, a prokaryotic cell lacks a true nucleus. The genetic materials of prokaryotic cells are naked. They contain single, circular chromosomes which are devoid of histone proteins.
    So, the correct answer is option A.
  • Question 6
    1 / -0
    The rough endoplasmic reticulum is specially well developed in cell actively engaged in
    Solution
    Endoplasmic reticulum (ER) is a tube-like structure present in the cell, which extends all over the cell. It is of two types rough (with ribosome) and smooth (without ribosome) endoplasmic reticulum. The rough endoplasmic reticulum is particularly well developed in cells actively engaged in protein synthesis. Generally, it is found in that part of cytoplasm which is basophilic, a property which is attributed to attached ribosomes which contain RNA.
  • Question 7
    1 / -0
    The functional activities of a cell are controlled and directed by the
    Solution
    The nucleus is the most important and the largest component of the cell. Nucleus regulates the four main functions of the cell which are protein synthesis, cell division, growth and differentiation are carried out by the nucleus. Nucleus regulates all these cellular activities by controlling the enzymes required for cellular processes. Enzymes are proteins and protein synthesis is controlled by nucleus as mRNA required for protein synthesis is made from DNA which is situated in the nucleus.

    Hence the correct option is B.
  • Question 8
    1 / -0
    Which cell organelle synthesizes acetylcholine?
    Solution
    The acetyl-CoA produces acetate for the synthesis of acetylcholine.  Acetyl-CoA is synthesized in the mitochondria as a by-product of the pyruvate dehydrogenase complex and used in Kreb's cycle for respiration.
  • Question 9
    1 / -0
    The cell organelle that has electron transport system is
    Solution
    Electron transport system is present in the cristae (inner membrane infoldings of mitochondria). It is made up of cytochromes and coenzymes which act as carrier molecules and transfer molecules. These molecules accept high energy electrons and pass them to next molecule in the system to pump protons for the formation of energy in the form of ATP.
  • Question 10
    1 / -0
    Besides nucleus, DNA is also present in
    Solution

    Mitochondria possess their own genetic material and ribosomes. The mitochondrial DNA possess genes which produce the proteins necessary for the functioning of mictochondria. They are also known as semi-autonomous organelle.

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