plant nutrients 2

Question 1

Fe in plants us taken up as

Answer 1

ferrous Ions Fe2+

Question 2

concentration of Fe ions

Answer 2

100-500Mg/kg

Question 3

iron is what metal and exhibits?

Answer 3

Transition, exhibits 2 oxidation states Fe(2) Fe(3) which forms a complex with organic ligands

Question 4

functions of Fe

Answer 4

1. constituent of two groups of proteins viz. a) heme proteins containing Fe porphyrin complex as a prosthetic group b) FeS protein in which S is coordinated to the thiol group of cysteine or to inorganic S: Ferrodoxin

Question 5

function of Fe

Answer 5

synthesis and maintenance of Chlorophyll

Question 6

Fe deficiency and symptoms

Answer 6

50 ppm. interveinal chlorosis appearing first on the younger leaves with leaf margins and veins remaining green

Question 7

Fe deficiency and symptoms

Answer 7

50 ppm. interveinal chlorosis appearing first on the younger leaves with leaf margins and veins remaining green

Question 8

Mn in plants in absorbed as

Answer 8

mn2+

Question 9

Mn concentration

Answer 9

20-300ppm

Question 10

Mn plays an important role in

Answer 10

Photosynthesis and detoxification of superoxide free radicals

Question 11

what is the reason Mn is associated with adverse effects on photosynthesis and O2 evolution

Answer 11

it is an integral component of water splitting enzyme associated with PS-2

Question 12

Mn is a constituent of

Answer 12

Mn-SOD( superoxide dismustase) which protects cells against deleterious effects of superoxide free radicals

Question 13

Mn deficient plants contains mn

Answer 13

less than 25ppm

Question 14

mn deficiency symptoms are more severe on

Answer 14

the middle leaf

Question 15

mn deficiency in dicots

Answer 15

interveinal chlorosis with chlorotic and necrotic spots in the interveinal areas

Question 16

deficiency symptoms of mn in monocots

Answer 16

greenish grey spots, flecks and stripes on the more basal leaves

Question 17

symptoms of mN deficiency are popularly known as

Answer 17

grey specks of oats, speckled yellow of sugarbeet, harsh spot of peas, pahala bligh of sugarcane and frenching of tung trees.

Question 18

which enzyme is used as an indicator for zn deficiency

Answer 18

Carbonic anhydrase

Question 19

zn conc. in plants

Answer 19

27-150ppm

Question 20

Zn plays an important role in the stabilization and structural orientation

Answer 20

of the membrane proteins

Question 21

under Zn deficiency excessive translocation of which element occurs

Answer 21

P, which leads to P toxicity

Question 22

names of Sn deficiency

Answer 22

Khaira disease in India (Hadda-Pakistan, Akagara type2- Japan, Taya-Taya and Apaya pula in Philippines) white bud of maize, mottle leaf, frenching of citrus, little leaf of cotton

Question 23

Zn deficiency first occurs in

Answer 23

3-4weeks old seedlings when the young leaves develop reddish brown pigmentation

Question 24

Cu conc. in plants

Answer 24

5-30ppm

Question 25

Cu toxicity occurs when conc. is

Answer 25

between 20 and 100 ppm

Question 26

Cu helps

Answer 26

reduce male sterility and affects the nodulations of legumes

Question 27

most imp effects of Cu deficiency

Answer 27

male sterility, delayed flowering and senescence

Question 28

Cu deficiency symptoms

Answer 28

chlorosis of younger shoot tissues, white shoots, reclamation disease, die back

Question 29

molybdenum is taken up by plants as

Answer 29

molybdate ions (MoO42-)

Question 30

mo conc.

Answer 30

0.1-2ppm

Question 31

BNF is catalyzed by Mo containing enzyme

Answer 31

nitrogenase which directly transfers electron to N2

Question 32

what has been used as an indicator for Mo status in plant

Answer 32

Nitrate reductase

Question 33

Mo affects the formation and viability of________ and development of

Answer 33

pollens, anthers

Question 34

Mo deficiency appear as

Answer 34

chlorotic mottlings between the veins on old or middle leaves, all over the surface

Question 35

Mo deficient cauliflower plants exhibit

Answer 35

chlorotic mottling and cupping of leaves