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CDS - Science Test 1434
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CDS - Science Test 1434
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  • Question 1/5
    1 / -0.33
    Which of the following statement is not correct regarding covalent bond?
    Solutions

    The bond formed by atoms by mutually sharing their electron pairs is known as covalent bond. Compounds with covalent bonds are poor conductor of electricity. The covalently bonded molecules have strong bond within the molecules,but their inter-molecular forces are weak. This makes the boiling and melting point of these compounds low.

  • Question 2/5
    1 / -0.33
    When an electron breaks a covalent bond, and moves away
    Solutions

    When electron breaks a covalent bond then at the place of electron a hole is created and thus due to this vacant place occupied by holes a valency is created in broken covalent bond.

  • Question 3/5
    1 / -0.33
    Ionic bond can be formed between two atoms when
    Solutions
    A low ionization energy helps in formation of cations and high electron affinity helps in the formation of anions. Thus, cation having a low ionization energy and an anion with a high electron affinity combine together to form an ionic compound having strong bonds. 
  • Question 4/5
    1 / -0.33
    Which of the following plant tissues is a living tissue?
    Solutions

    • Parenchyma plant tissues are living tissue.

    • Parenchyma tissue is present in roots, stems, and leaves.

    • It takes part in photosynthesis. Parenchyma contains thin-walled cells with very large central vacuoles.

    • Parenchyma tissues are wounded then it goes back to meristematic plant tissue to grow back the damaged part.

    • Sclerenchyma is structural tissue where the cell wall and structure remain after it dies.

  • Question 5/5
    1 / -0.33
    What tissue is known as water conducting tissue?
    Solutions

    • Xylem tissue is known as water conducting tissue . Xylem is for transporting water and minerals absorbed by the roots .

    • Phloem is responsible for transporting food from leaves (photosynthesis site) to non -photosynthesizing parts of a plant such as root and stems.

    • Simple tissue are homogeneous -Composed of structurally and functionally similar cells.

    • Example- Parenchyma ,Collenchyma and Sclerenchyma .

    • Permanent tissues are made of meristematic cells, that has definite form and shape and have lost the power to divide and differentiate and are three types- simple, complex and special.

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