ICSE 2009 Solved Important Papers of Biology By Mr. M. P. Keshari

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Biology - Absorption by Roots (Solved)

Question .1. Name the following :

(i) The tissue that transports manufactured starch from the leaves to all parts of plants.  

(ii) The tissue responsible for the ascent of sap in plants.

(iii) The pressure responsible for the movement of water molecules across the cortical cells of the root.

(iv) Condition of a cell placed in hypotonic solution.

(v) The process by which water enters the root hair cell.

(vi) The pressure exerted by cell contents on a plant cell wall.

(vii) Tissue concerned with upward conduction of water in plants.

(viii) Condition of cell in which the cell contents are shrunken.

(ix) The inward movement of solvent molecules through the plasma membrane of a cell.

(x) The process by which raisin swell up when placed in a beaker of water.

(xi) Marine fish when thrown under tap water bursts because of :

(a) Endosmosis

(b) Exosmosis

(c) Diffusion

(d) Plasmolysis.

(xii) Name the structure which transports manufactured food from leaves to other parts of the plant.

(xiii) Name the kind of cells that constitute the cortex of a root.

(xiv) Name the process by which intact plants lose water in the form of droplets.

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Question .2. State true or false :

(i) Cells that have lost their water content are said to be deplasmolysed.

(ii) Xylem is the water conducting tissue in plants.

(iii) Spreading of particles by mixing is called diffusion.

(iv) Root hairs are extension of epidermal cells.

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Question . 3. Arrange the following in correct order so as to be in a logical sequence:

(i) Endodermis, root hair, xylem, soil water, cells of cortex.

(ii) Cortical cell, root hair, xylem, water, veins.

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Question .4. Define the following :

(i) Hypotonic solution.

(ii) Active transport.

(iii) Diffusion.

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Question .5. Explain the term plasmolysis. Give one application of this phenomenon in our daily life.

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Question .6. Differentiate between : -

(i) Cobalt chloride paper and goats bladder.

(ii) Osmosis and diffusion.

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Question .7. Choose the correct alternative :

(i) Marine fish when thrown under tap water bursts because of (endosmosis, exosmosis, diffusion, plasmolysis).

(ii) The space between the cell wall and plasma membrane in plasmolysed cell is filled with (isotonic solution, hypotonic solution, hypertonic solution, water).

(iii) Osmosis involves diffusion of (suspended particles from lower to higher concentration, suspended particles from higher to lower concentration, water from the more concentrated solution to the less concentrated solution, water from the less concentrated solution to the more concentrated solution).

(iv) The process by which molecules distribute themselves evenly with in the space they occupy is termed as (osmosis, diffusion, active transport, imbibition).

(v) Synthesized food in green leaves is transported through (phloem, xylem, pith).

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Question .8. Give biological reasons for :

(i) Salt and sugar are used in preserving food.

(ii) Some plants show wilting of their leaves during mid day even when the soil is well watered.

(iii) On sprinkling common salt on grass growing in a lawn, the grass is killed.

(iv) Wilted lettuce leaves if kept in cold water become crisp.

(v) Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered.

(vi) Grapes shrink when immersed in a very strong sugar solution.

(vii) Root hairs become flaccid, when fertilizers are added to the moist soil around it.

(viii) Transplanting of seedling to a flower bed in the evening is better than doing so in the evening.

(ix) Strips of potato placed in 50% sucrose solution appear soft and shriveled.

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Question .9. Potato cubes 1 cm in size were placed in two containers, one containing water, the other containing concentrated sugar solution. After about 24 hours when the cubes were examined, then those placed in water were found to be firm and had increased in size by a few millimeters. Those placed in concentrated sugar solution were found to be soft and had decreased in size. Use the above information to answer the questions that follow :

(i) Account for the firmness and increase in size of the potato cubes which were placed in water.

(ii) Account for the softness and decrease in size of the potato cubes which were placed in the sugar solution.

(iii) Name and define the physical process being investigated in this experiment.

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Question .10. The diagram below represents an experimental set up to demonstrate a vital process. Study the same and then answer the questions that follow :

Fig.  

(i) Name the above process.

(ii) Define the above named process.

(iii) Mention two advantages of this process to the plant.

(iv) Name two liquids that could be used in this experiment.

(v) Why did the level of the liquid in the vertical tube rise ?

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Question .11. The figure given below is a diagrammatic representation of a part of cross section of the root in the root hair zone. Study the same and then answer the question that follow:

(i) Name the parts indicated by guidelines ‘1’ to ‘5’.

(ii) Is the root hair cell unicellular or multi-cellular ?

(iii) Draw a labelled diagram of the root hair cell as it would appear if some fertilizer is added to the soil close to it.

(iv) Name the process responsible for the entry of water molecules from the soil into A1 and then A2.

(v) What pressure is responsible for the movement of water in the direction indicated by arrows ?

(vi) How is this pressure set up ?

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Question .12. Given below is the diagrammatic representation of the transverse section of a part of a plant. Study the same and answer the questions that follow :

 Fig.  

(i) Name the part of the plant that is shown.

(ii) Label the parts 1 to 6, indicated in the diagram.

(iii) Write the functions of parts 3 and 5.

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Question .13. Given below are the diagrams of a certain structure in plants in two conditions :

Fig.

(i) Name the structure shown.

(ii) Name the parts numbered 1 – 5.

(iii) What is the most apparent difference between A and B in the structure shown ?

(iv) Describe the mechanism which brings about the change in the structures depicted in A and B.

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