Absorption by Roots ICSE Class-10 Concise Selina Biology Solutions

Absorption by Roots ICSE Class-10 Concise Selina Biology Solutions Chapter-4.  We Provide Step by Step Answer of Progress Check 1, 2, 3, 4 , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type Questions and Structured / Applications / Skill Type Questions of Exercise-4 Absorption by Roots. Visit official Website CISCE  for detail information about ICSE Board Class-10.

Board ICSE
Publications Selina Publishers PVT LTD
Subject Concise Biology
Class 10th
writer HS Vishnoi
Chapter-4 Absorption by roots
Topics Solutions of  MCQs, Very Short ,Descriptive and Structural/Skill Questions and Progress Check 1, 2, 3, 4,
Edition 2021-2022

Absorption by Roots ICSE Class-10 Concise Selina Biology Solutions Chapter-4


-: Select Topics :-

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A-MULTIPLE CHOICE TYPE

B. VERY SHORT ANSWER TYPE

C. SHORT ANSWER TYPE

D. DESCRIPTIVE ANSWER TYPE

E. STRUCTURED/APPLICATION/SKILL TYPE

Progress Check 1, 2, 3, 4,


A. MULTIPLE CHOICE TYPE 

Absorption by Roots ICSE Class-10 Concise Selina Biology Solutions

Page 51

Question 1

Absorption of water by the plant cells by surface attraction is called:

a) Diffusion

b) Osmosis

c) Imbibition

d) Endosmosis

Answer 1

(c) Imbibition

Question 2

A plant cell placed in a certain solution got plasmolysed. What was the kind of solution?

a) Isotonic sugar solution

b) Hypotonic salt solution

c) Hypertonic salt solution

d) Isotonic salt solution

Answer 2

c) Hypertonic salt solution

Question 3

The state of a cell in which the cell wall is rigid and stretched by the increase in volume due to the absorption of water is called

a) Flaccidity

b) Turgidity

c) Capillarity

d) Tonicity

Answer 3

b) Turgidity

Question 4

Which one of the following is a characteristic NOT related with the suitability of the roots for absorbing water?

a) Tremendous surface area

b) Contain cell sap at higher concentration than the surrounding water

c) Root hairs have thin cell walls

d) Grow downward into the soil

Answer 4

d) Grow downward into the soil

Question 5

Movement of molecules of a substance from the region of their higher concentration to the region of their lower concentration without the involvement of a separating membrane, is called:

a) Osmosis

b) Diffusion

c) Active transport

d) Capillarity

Answer 5

b) Diffusion

Question 6

Osmosis and diffusion are the same except that in osmosis there is

a) a freely permeable membrane

b) a cell wall in between

c) a selectively permeable membrane in between

d) an endless inflow of water into a cell

Answer 6

c) a selectively permeable membrane in between

Question 7

The highest water potential (capacity to move out to higher concentrated solution) is that of

a) Pure water

b) 10% salt solution

c) Honey

d) 50% sugar solution

Answer 7

a) Pure water

Question 8

The space between the cell wall and plasma membrane in a plasmolysed cell is filled with

a) isotonic solution

b) hypotonic solution

c) hypertonic solution

d) water

Answer 8

d) water

Question 9

What is responsible for guttation?

a) Osmotic pressure

b) Root pressure

c) Suction pressure

d) Capillarity

Answer 9

b) Root pressure

Question 10

The most appropriate characteristic of semi-permeable membrane is that

a) it has minute pores

b) it has no pores

c) it allows the solute to pass through but not the solvent

d) it allows a solvent to pass through freely but prevents the passage of the solute

Answer 10

d) it allows a solvent to pass through freely but prevents the passage of the solute

.


B. VERY SHORT ANSWER TYPE 

Absorption by Roots ICSE Class-10 Concise Selina Biology Solutions

Page 51-52

Question 1

Name the following:

(a) The condition of a cell placed in a hypotonic solution.

(b) Process by which intact plants lose water in the form of droplets from leaf margins.

(c) Process by which water enters root hairs.

(d) The tissue concerned with upward conduction of water in plants.

(e) The term for the inward movement of solvent molecules through the plasma membrane of a cell.

(f) The process by which molecules distribute themselves evenly within the space they occupy.

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

Answer 1

(a) Turgidity

(b) Guttation

(c) Osmosis

(d) Xylem

(e) Endosmosis

(f) Diffusion

(g) Root pressure

Question 2

Give the equivalent terms for the following:

(a) Pressure exerted by the cell contents on the cell wall.

(b) The condition in which the cell contents are shrunken.

(c) Loss of water through a cut stem.

Answer 2

(a) Turgor pressure

(b) Flaccidity

(c) Bleeding

Question 3

Complete the following statements:

(a) Hypotonic solution is one in which the solution kept outside the cell has lower solute concentration than __________ the cell.

(b) Active transport is one in which the ions outside the roots move in with expenditure of energy __________.

(c) The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of _____.

Answer 3

(a) the fluids inside

(b) from the region of their lower concentration outside to the region of their higher concentration inside

(c) turgor movements

Question 4

Fill in the blanks by choosing the correct alternative from those given in brackets:

(a) When placed in a more concentrated solution, the cell contents will ……….. (shrink/swell up)

(b) The pressure by which the …………. molecules tend to cross the semi-permeable membrane is called osmotic pressure. (salt/water)

(c) Active transport is in a direction ………….. to that of diffusion. (opposite/same)

Answer 4

(a) shrink

(b) water

(c) opposite

Question 5

Match the terms in column I those  in column II

Column I Column II
a Xylem (i) semi-permeable
b Phloem (ii) permeable
c Cell membrane (iii) downward flow of sap
d Root pressure (iv) upward flow of water
e Cell wall (v) guttation

Answer 5

Column I Column II
a Xylem (iv) upward flow of water
b Phloem (iii) downward flow of sap
c Cell membrane (i) semi-permeable
d Root pressure (v) guttation
e Cell wall (ii) permeable

C. SHORT ANSWER TYPE 

Absorption by Roots ICSE Class-10 Concise Selina Biology Solutions

Page 52

Question 1

Differentiate between the following :

(a) Plasmolysis and deplasmolysis

(b) Turgor pressure and wall pressure

(c) Hypotonic and hypertonic Solution

(d) Turgidity and flaccidity

Answer 1

(a)

Plasmolysis Deplasmolysis
1. It refers to the shrinkage of the cytoplasm and withdrawal of the plasma membrane from the cell wall caused due to the withdrawal of water when placed in a hypertonic solution.

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