D. Answer these questions.
1. Why does our body need new cells?
2. Why is the cell called the basic unit of structure
and function of living organisms?
3. Give salient features of the cell theory.
4. What is cell sap? What does it contain?
5. What are plastids? Name different types of
plastids and their functions.
6. Why are chloroplasts found only in plant cells?
Explain.
7. Why is the nucleus called the control centre
of the cell?
8. Give functions of vacuole in plant cell.
9. Why is cell division essential?
ucleoplasm
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energy for
Answers
Answer:
In order for our bodies to grow and develop, they must produce new cells—and allow for the death of old cells. Cell division is also an essential component of injury repair. If our cells couldn't divide and create new cells, our bodies could never produce new skin cells to heal road rash, or grow a fingernail back.
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Answer:
1. In order for our bodies to grow and develop, they must produce new cells—and allow for the death of old cells. Cell division is also an essential component of injury repair. If our cells couldn't divide and create new cells, our bodies could never produce new skin cells to heal road rash, or grow a fingernail back.
2.The cell is called the structural and functional unit of life as all living organisms are made up of cells. ... Furthermore, cells provide form and structure, process nutrients and convert it into useable energy. Multicellular organisms have specialized cells that perform specific functions.
3. The generally accepted parts of modern cell theory include:
All known living things are made up of one or more cells.
All living cells arise from pre-existing cells by division.
The cell is the fundamental unit of structure and function in all living organisms.
4. Cell sap is a fluid found in the vacuoles (small cavities) of the living cell; it contains variable amounts of food and waste materials, inorganic salts, and nitrogenous compounds. ... Phloem, or sieve-tube, sap is the fluid carrying sugar from leaves to other parts of the plant in the summer.
5. Plastid is a membrane-bound organelle found in the cell of plants, algae and few eukaryotic cells.
It the site of production and storage of important chemical compounds which are used by the cells of autotrophic organisms.
They contain pigments which are used in photosynthesis and the types of pigments determine the cell's colour.
The types of plastids are-
1) Chloroplasts:- are the green plastids which contain chlorophyll pigments for photosynthesis.
2) Chromoplasts:- are the coloured plastids for pigment synthesis and storage.
The pigment present in them is carotene which gives a different colour to fruits and flowers.
3) Gerontoplasts:- are the chloroplasts that are going through the ageing process.
These are present in the leaves in which no more photosynthesis occurs (such as in the fall months).
4) Leucoplasts: are the colourless plastids for monoterpene synthesis found in non- photosynthetic parts of the plants.
They are of three types:-
a) Amyloplasts- stores starch.
b) Proteinoplasts- stores proteins.
c) Elaioplasts- stores fats and oils.
6. Chloroplast is specific to plant cell because plants are the autotrophs which can prepare their food by conversion of light energy to chemical energy. It is the vital photosynthetic pigment in leaves as it involves the conversion of light energy into chemical energy.
7. The nucleus is generally considered the control center of the cell because it stores all of the genetic instructions for manufacturing proteins.
8. The vacuole plays an important role in the homeostasis of the plant cell. It is involved in the control of cell volume and cell turgor; the regulation of cytoplasmic ions and pH; the storage of amino acids, sugars, and CO2; and the sequestration of toxic ions and xenobiotics.
9. Cell division plays an important role in all living organisms, as it is essential for growth, repair and reproduction. This process helps in: Renewing of damaged cells.
Explanation:
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