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Transportation Life Processes MCQS Class 10 Science

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1 Transportation MCQS With Solution
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Transportation MCQS With Solution

1.  The hypotonic solution is that which :

(A) Has less concentration than that of cell sap

(B) Has more concentration than that of cell sap

(C) Has same concentration as that of cell sap

(D) Has same concentration as that of cell sap but its pH value is above 7.

Solution

Ans.     (A)

Sol.      If the osmotic pressure of the outer solution is less than that of the cell sap then the outer solution is called hypotonic solution.

2.  Of the processes which occur in leaf the one which may lower their temperature (cooling effect) is :

(A) Respiration                                                

(B) Photosynthesis                                          

(C) Transpiration                                              

(D) Hydrolysis

Solution

Ans.     (C)

Sol.      Leaves transpire large quantity of water and that water has a high heat of vapourization. It would appear that the temperature of leaf would be greatly lowered by transpiration.

3.  Absorption of water by root is increased with the :

(A) Increase in transpiration                              

(B) Increase in rate of photosynthesis

(C) Decrease in transpiration                            

(D) Decrease in salt uptake

Solution

Ans.     (A)

Sol.      The entry of water into the roots is brought about by conditions which originate at the top of the plant (Transpiration) and root cells play only a subsidiary role.

4.  The most important factor for absorption of water is :

(A) Living cell                                                  

(B) Force of capillarity

(C) Imbibition                                                  

(D) Cohesive power of water

Solution

Ans.     (A)

Sol.      Water is absorbed by root hairs and these are living single celled structures.

5.  In submerged hydrophytes, the absorption of water takes place through :

(A) Root                                                         

(B) Stem                                                         

(C) Leaf                                                          

(D) General surface of plant

Solution

Ans.     (D)

Sol.      In submerged hydrophytes root system is not developed so water is absorbed by general body surface.

6.  Ascent of sap means

(A) Diffusion of water                                      

(B) Building up of carbohydrates

(C) Loss of water from leaves

(D) The vertical rise of water in the stem against the force of gravity

Solution

Ans.     (D)

Sol.      The upward movement of water from the root towards the top of the plant is known as ascent of sap.

7.  Difference between the term “Adhesion” and “Cohesion” is :

(A) Adhesion is union of similar parts.              

(B) Cohesion is the adhesion of dissimilar parts

(C) Both are wrong                                          

(D) Both are right

Solution

Ans.     (C)

Sol.      Cohesion is the force between the water molecules (same molecules) and adhesion is force between the walls of xylem vessels and water (different molecules).

8.  In a branch cut from a rapidly transpiring plant, water snaps away from the cut end. It shows that :

(A) It is under tension                                      

(B) It is in excess in vessels

(C) It has been absorbed by capillary force

(D) It has been absorbed by imbibition force

Solution

Ans.     (A)

Sol.      Xylem vessels attract the water molecules by adhesion and water molecules attract other water molecules by cohesion. Both the forces together, help to form a thin, unbroken column of water in the capillaries of xylem vessels. The transpiration pull lifts the column up by creating tension.

9.  Xylem conducts sap from :

(A) Leaves to roots                                         

(B) Roots to leaves

(C) Root to root                                              

(D) Stems to roots

Solution

Ans.     (B)

Sol.      Xylem is water conducting tissue which transfers water from root to aerial parts of plant.

10.  Cohesion transpiration pull theory operates only in :

(A) Passive water absorption                           

(B) Active water absorption

(C) Conditions favouring transpiration              

(D) Conditions restricting transpiration

Solution

Ans.     (A)

Sol.      The entry of water into the roots is brought about by conditions which originate in the top of the plant (Transpiration) and root cells play only a subsidiary role. The cohesion theory is based on the force of cohesion between the water molecules and the transpiration pull created at the leaves. In addition there is also a force of adhesion between the walls of xylem vessels and water.

11.  Transpiration is mainly helpful in :

(A) Cooling                                                     

(B) Loss of water

(C) Ascent of sap                                            

(D) Both A and C

Solution

Ans.     (D)

Sol.      Transpiration is the phenomenon of evaporation of water from the plant surface. It brings about absorption and ascent of sap and cools the plant at high temperatures.

12.  The stomata open and close due to :

(A) turgor pressure of guard cells                     

(B) gaseous pressure

(C) their genetic constitution                            

(D) both (A) and (B)

Solution

Ans.     (A)

Sol.      When guard cells are turgid, the stoma opens and when guard cells lose water, stoma closes.

13.  Transport of water through xylem in tall plants is best explained by :

(A) Root pressure theory                                 

(B) Pulsation theory                                         

(C) Capillary theory                                          

(D) Cohesion theory

Solution

Ans.     (D)

Sol.      The cohesion theory is based on the force of cohesion between the water molecules and the transpiration pull created at the leaves. It explains how water moves up in the xylem vessels in a plant.

14.  Transpiration occurs through :

(A) Only leaves                                               

(B) Stem                                                         

(C) Roots                                                        

(D) Aerial part of plants

Solution

Ans.     (D)

Sol.      Transpiration is the loss of water in the form of water vapour from the aerial parts of the plant.

15.  Ascent of sap occurs by means of :

(A) Cortex                                                       

(B) Pith

(C) Phloem                                                     

(D) Xylem

Solution

Ans.     (D)

Sol.      Xylem is water conducting tissue. Upward movement of water is known as ascent of sap. Xylem helps in ascent of sap.

16.  Which type of transpiration plays major role :

(A) Cuticular transpiration                                 

(B) Stomatal transpiration

(C) Lenticular transpiration                               

(D) Bark transpiration

Solution

Ans.     (B)

Sol.      Stomata present on leaves plays important role in transpiration. It amounts to about 90% of transpiration in plants.

17.  Which of the following is a dead cell :

(A) Sieve tube                                                 

(B) Companion cell                                          

(C) Parenchyma                                              

(D) Tracheid

Solution

Ans.     (D)

Sol.      Tracheids are components of xylem. These are dead due to deposition of lignin.

18.  Theory of ‘Ascent of Sap’ was given by Dixon and Jolly. Which of them is against the theory :

(A) Cohesive and Adhesive properties of H2O  

(B) Requirement of ATP

(C) Presence of pores in tracheary elements     

(D) All of these

Solution

Ans.     (B)

Sol.      The cohesion theory is based on the force of cohesion between the water molecules and the transpiration pull created at the leaves. It explains how water moves up in the xylem vessels in a plant. From soil to roots water moves due to the difference in water potential. Since water potential of root cells is lower than the water potential in soil, movement of water occurs from soil to the roots. It is passive process.

19.  Water in plants is transported by (ascent of sap takes place through) :

(A) Cambium                                                   

(B) Phloem

(C) Xylem or xylem vessel elements                 

(D) epidermis

Solution

Ans.     (C)

Sol.      Xylem is water conducting tissue. Upward movement of water is known as ascent of sap. Xylem helps in ascent of sap.

20.  The process of transpiration in plants help in :

(A) Opening of stomata                                    

(B) Absorption of CO2 from atmosphere

(C) Upward conduction of water and minerals   

(D) Absorption of O2 from atmosphere

Solution

Ans.     (C)

Sol.      Transpiration is the phenomenon of evaporation of water from the plant surface. It brings about absorption and ascent of sap.

21.  Eosinophil, basophil and neutrophil are types of :

(A) RBCs                                                        

(B) Proteins                                                    

(C) Platelets                                                    

(D) WBCs

Solution

Ans.     (D)

Sol.      Leucocytes (WBC’s) are divided into two main types, Agranulocytes and granulocytes, depending on the absence and presence of granules in the cytoplasm granulocytes are further divided into Eosinophil, basophil and neutrophill.

22.  Phagocytosis is carried out by :

(A) RBCs                                                        

(B) WBCs                                                       

(C) Platelets                                                    

(D) all the three

Solution

Ans.     (B)

Sol.      The main function of Leucocytes (WBC) is to destroy harmful bacteria, germs or some other foreign material from the tissues and blood by ingesting them (Phagocytosis).

23.  The liquid part of blood is called :

(A) matrix                                                        

(B) lymph                                                        

(C) plasma                                                      

(D) stroma

Solution

Ans.     (C)

Sol.      Blood consists of a straw coloured aqueous fluid called plasma in which float the formed elements of blood called blood corpuscles.

24.  The blood cells responsible for clotting of blood are :

(A) erythrocytes                                              

(B) blood platelets

(C) white blood cropuscles                              

(D) red blood cells

Solution

Ans.     (B)

Sol.      When a blood vessel is damaged, the blood platelets aggregate at the site, stopping the flow of blood. They release certain chemicals called platelet factors which initiate the mechanism of blood clotting.

25.  The particles in the blood that protect the body from different diseases are called :

(A) Erythrocytes                                              

(B) Haemoglobin                                             

(C) Leucocytes                                                

(D) Gamma globulin

Solution

Ans.     (C)

Sol.      The main function of Leucocytes (WBC) is to destroy harmful bacteria, germs or some other foreign material from the tissues and blood by ingesting them (Phagocytosis).

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