Transport In Plants

Question 1

Transport of water through xylem is unidirectional or multidirectional?

Answer 1

Unidirectional

Question 2

Transport through Phloem is unidirectional or multidirectional

Answer 2

Multidirectional

Question 3

Transport through vascular system is called

Answer 3

Translocation

Question 4

State the features of simple diffusion

Answer 4

Simple diffusion is random , Slow, passive and not dependent on system in which it is occurring

Question 5

Highest concentration of oxygen in a leaf is present in

Answer 5

Lumen of thylakoids

Question 6

Why is diffusion very important for plants

Answer 6

Because it is the only means for gaseous movement within plant body

Question 7

State the features of facilitated diffusion

Answer 7

Facilitated diffusion is passive, downhill transport, helped by channel and allows movement of hydrophilic substances

Question 8

State three features of channel

Answer 8

Selective, saturation and inhibition

Question 9

What are inhibitors

Answer 9

Inhibitors are chemicals that can bind with protein side chain and can change the shape of channel

Question 10

Porins are located on

Answer 10

Mitochondria, plastids and some bacteria (gram -ve)

Question 11

Water channels are made up of

Answer 11

8 different types of Aqua Porins

Question 12

The process in which molecule moves across the membrane independent of other molecules is

Answer 12

Uniport

Question 13

State the features of active transport

Answer 13

Uphill transport, active and occur with the help of pump made up of protein

Question 14

Cytoplasmic streaming is active or passive?

Answer 14

Active process

Question 15

State the direction of movement of water with respect to water potential

Answer 15

High water potential to lower water potential

Question 16

On adding Solute, solute potential ??

Answer 16

Decreases

Question 17

State the direction of movement of water with respect to solute potential

Answer 17

High solute potential to lower solute potential

Question 18

Water potential is a concept fundamental to understanding

Answer 18

Water movement

Question 19

Water potential of pure water at standard temperature which is not under any pressure is taken to be

Answer 19

Zero

Question 20

What is tonoplast

Answer 20

Tonoplast is lipid bilayer of vacuole

Question 21

State the movement of water with respect to Osmotic pressure

Answer 21

Low osmotic pressure to high osmotic pressure

Question 22

Vacuole is …………… as compared to cytoplasm

Answer 22

Hypertonic

Question 23

What is protoplast

Answer 23

Cytoplasm + plasma membrane

Question 24

State the value of turgor pressure in flaccid, turgid and plasmolysed cell

Answer 24

Turgor pressure is zero in flaccid cell, positive in turgid cell and negative in plasmolysed cell

Question 25

During plasmolysis water is first lost from ………… and then from …………

Answer 25

Cytoplasm, vacuole

Question 26

Order of occurrence of imbibition

Answer 26

Agar agar > pectin > protein > starch > cellulose

Question 27

On adding solute, diffusion pressure(DP)…………

Answer 27

Decreases

Question 28

On adding solute, diffusion pressure deficit (DPD)……………

Answer 28

Increases

Question 29

Formula for DPD is ??

Answer 29

DPD=OP-TP

Question 30

State one dissimilarity between mass flow and diffusion

Answer 30

In mass flow substances whether in solution or in suspension are swept along at the same pace while in diffusion substances move independently depending on their concentration gradient

Question 31

Water in roots is always absorbed

Answer 31

Passively

Question 32

Mineral absorption is

Answer 32

Both active and passive (mostly active)

Question 33

Mineral is always absorbed in …… form

Answer 33

Ionic

Question 34

Water potential is affected by: (a) Solute concentration (b) Pressure (c) Temperature (d) All of these

Answer 34

(d)

Question 35

Pressure can build up in a plant system when water enters a plant cell due to diffusion causing a pressure built up against the cell wall, it makes the cell turgid this increases the: (a) Solute potential (b) Pressure potential (c) Water potential (d) Both (a) and (b)

Answer 35

(b)

Question 36

The translocation of organic solutes in sieve tube members is supported by

Answer 36

Mass flow involving a carrier and ATP

Question 37

Glycolate induces opening of stomata in

Answer 37

Low CO2 concentration

Question 38

Example of a plant in which sunken stomata are found

Answer 38

Nerium

Question 39

The direction and rate of water movement from Cell to cell is based on

Answer 39

Diffusion pressure deficit

Question 40

In guard cells when sugar is converted into starch the stomatal pore

Answer 40

Close completely

Question 41

Girdling experiment cannot be performed within sugarcane because

Answer 41

Vascular bundles are not present in a ring

Question 42

Spraying of phenyl mercuric Acetate in leaves _____________ transpiration

Answer 42

Reduces

Question 43

Root pressure develops due to

Answer 43

Active absorption