4. Absorption By Roots

Question 1

Define Guttation

Answer 1

Guttation is the process by which drops of water appear along the leaf margins due to excessive roots pressure

Question 2

Define bleeding

Answer 2

Bleeding is the loss of cell sap through a cut stem

Question 3

State the sentence whether it is true of false
1. Guttation takes place maximum at early mornings.
2. Raisins submerge in water swells up due to Exosmosis

Answer 3

1. True
2. False

Question 4

Give two examples of turgor moments of plants

Answer 4

1. Shame Plant/ Mimosa pudica/ Touch me not Plant.
2. Insectivorous Plants

Question 5

Define Imbibition

Answer 5

Imbibition is a phenomenon by which living or death cell absorb water by surface attraction.

Question 6

Define diffusion

Answer 6

Diffusion is a free movement of molecules from Higher concentration to lower concentration in a direct contact

Question 7

Define osmosis

Answer 7

Osmosis is a movement of water molecules from higher concentration to lower concentration through a semipermeable membrane.

Question 8

Define active transport

Answer 8

Active transport is the passage of substance from its lower to higher concentration through a living cell membrane using cell energy.

Question 9

Root hair is an extension of

Answer 9

Epidermal cells

Question 10

Mention any three characters of roots

Answer 10

1. Surface area of root is enormous.
2. Root Hairs has contain Cell sap of higher concentration than the surrounding water.
3. Root has have thin Walls.

Question 11

Primary functions of root

Answer 11

1.Photosynthesis
2.Transpiration
3.Mechanical stiffness

Question 12

State any four logical reasons for which plants need roots

Answer 12

1. Root draws water from the surrounding
2. Ability to provide mechanical stiffness
3. Conducts photosynthesis
4. Excess of water dissipated in during transpiration

Question 13

If you uproot a plant from the soil it wilt soon? Why?

Answer 13

That leaves continue losing water by Transpiration, therefore no more water left that is absorbed by roots. So leaves wilt.

Question 14

If you Sprinkle some common salt on growing grass, it is killed at that spot? why?

Answer 14

Due to Exosmosis takes place himself it becomes flaccid, as a result of plasmolysis the grass a killed.

Question 15

Soaked seeds burst their seed coats. State your view

Answer 15

The soaked seeds swell up when soaked in water due to imbibition and the endosmosis. Due imbibitional pressures seed code ruptures in the beginning of germinating seeds.

Question 16

Define between hypotonic and hypertonic solution

Answer 16

Hypotonic solution - In this condition, The solution outside the cell has lower concentration than the fluid inside the cell. Turgid Condition. Endosmosis

Hypertonic solution - In this condition, the solution outside the cell has higher concentration than the fluids inside the cell. Flaccid Condition. Exosmosis

Question 17

Remember the views about turgidity and flaccidity

Answer 17

Turgidity - In this state of cell with cell with rigid cell wall and stretched by increase of volume of vaculoes due to absorption of water. Hypotonic Solution

Flaccidity - In this condition the cell content is not rigid and the cell is not tight. Hypertonic solutic Solution

Question 18

What is mean by transpiration pull

Answer 18

As water is lost from the leaf surface by transpiration, more water molecules are pulled up due to tendency of water molecules to remind conjoined. this produces continuous column of water throughout the stem which is known as Transpiration pull.

Question 19

Name any one feature of this plant cell which is not present in animals cell

Answer 19

Cell wall

Question 20

Name for selectively membrane which is used for experimental purpose

Answer 20

Parchment paper, animal bladder, egg membrane, Visking bag.