plant physiology

Question 1

water is absorbed along with mineral solutes by the roots purely by

Answer 1

diffusion

Question 2

mass flow of water occurs due to

Answer 2

adhesive or cohesive properties of water

Question 3

the symplastic system is the system of

Answer 3

interconnected protoplast

Question 3

the fungus provides water and minerals to the root i turn root provides

Answer 3

sugars and nitrogen containing compounds

Question 4

———-% of water reaching the leaves is used in photosyenthesis and plant growth

Answer 4

less than 1 %

Question 5

the upward flow of water through xylemin planrs can achieve fairly high rates up to ———

Answer 5

15m/hr

Question 6

when will stoma close

Answer 6

when the guard cells become flaccid

Question 7

————-are oriented radially than longitudinally making it ieasier for the stoma to open

Answer 7

cellulose microfibril

Question 8

in ————-and ——— the lateral meristem vascular cambium coerk cambium appear later in the life

Answer 8

dicoteledonous plants and gymnosperms

Question 9

single maize root apical meristem can give rise to more than ————new cells per hour

Answer 9

17500 cells per hour

Question 10

cells in a watermelon may increase in size upto

Answer 10

3lakh 50 thousand times

Question 11

meristamatic phase characteristics

Answer 11

rich in protoplasm
large conspicious nuclei
cells walls primary in nature
thin cellulosic abundant plasmodesmatal connections

Question 12

elongation phase characteristics

Answer 12

increased vacuolation
cell enlargement
new cell wall deposition

Question 12

maturation phase characteristics

Answer 12

attain max size (cell wall)

protoplasmic modification

Question 13

—– is partly responsible for the water potentisl gradient in roots,and therefore for the uptake of water by osmosis

Answer 13

active uptale of ions

Question 14

root endodermis because of the layer of —–has the ability to actively transport ions in one direction only

Answer 14

suberin

Question 15

transport proteins of endodermal cells are —- where a plants adjust the quantity and types of solute that reach the xylem

Answer 15

control points

Question 16

forces generated by transpiration can create pressure sufficient to lift a xylem sized coloum of water over —–m high

Answer 16

130 m

Question 17

diffusion across small distamces ,substances move by —————and ————-supplimented by active transport

Answer 17

diffusion and by cystoplasmic streaming

Question 18

azotobacter and beijerinchia are

Answer 18

free living nitrogen fixing aerobic microbes

Question 19

rodospirillum is

Answer 19

anaerobic freeliving

Question 20

cysnobacteria is

Answer 20

freeliving nitrogen fixers

Question 21

frankia produce nitrogwn fixing nodules on the rooot of non leguminous plants eg

Answer 21

alnus

Question 22

rod shaped rhizobium has such relationship with the roots of several legumes such as

Answer 22

alfafa sweet pea sweet clover lentils garden pea broad bean clover beans

Question 23

-----and -----are freeliving in soil but as symboints cam fix atm nitrogen

Answer 23

rhizobium and frankia

Question 24

a watermelon has over--- % water

Answer 24

92%

Question 25

most hebaceous plants have only about ----% fresh weight as dry matter

Answer 25

10-15%

Question 26

a mature corn absorbs almost --of water in a day

Answer 26

3L

Question 27

mustard plant absorbs water equal to its own weight in

Answer 27

5 hours

Question 28

mass flow occurs as a result of

Answer 28

pressure diff bet two points

Question 29

movement of a molecule across a typical plant cell (about 15 micrometer ) takes approximately

Answer 29

2.5 sec

Question 30

deficiency of actively mobilising element appears first in

Answer 30

older tissues

Question 31

chlorosis defieciency

Answer 31

n,k,mg,s,Mo,fe,zn,mn

Question 32

necrosis due to def of

Answer 32

ca,mg,cu,k

Question 33

inhibition of cell division

Answer 33

Mo,N,K,S

Question 34

DELAY FLOWERING

Answer 34

Mo,N,S

Question 35

weathering enrich the soil with

Answer 35

dissolved ions and inorganic salts

Question 36

methods like hydroponics require

Answer 36

purified water and mineral nutrients

Question 37

hydroponics success in commercial prod of vegetable such as

Answer 37

tomato seedless cucumber lettuce

Question 38

in facr more than ----------elements of 105 discovered so far are found in different plants

Answer 38

60

Question 39

there are technics that are able to detect the minerals even at a very low concentration of

Answer 39

10^-8g/ml

Question 40

macronutrients are generally present in plant tissues in large amounts like

Answer 40

in excess of 10mmole kg^-1