(1)The deficiency of any element can cause multiple symptoms.(2)Same symptoms may be caused by the deficiency of one or several different elements.(3)The concentration of the essential element below which plant growth is retarded is termed as critical concentration.(4)Chlorosis is the loss of chlorophyll due to deficiency of N, K, Mg, Fe, S, Mn, Zn, Mo(5)Different plants respond differently to the deficiency of the same element.

(1), (2), (3), (4) and(5)
(1) and (4)
(1) and (3)
(3) and (4)

Hydroponics
(1)is useful in areas having thin; infertile and dry soils.
(2)can regulate pH optimum for a particular crop.
(3)increases labour cost.
(4)increases problem of weeding.

(1), (2) and (3) are correct.
(1) and (2) are correct.
(2) and(4) are correct.
(1) and (3) are correct.

The deficiency symptoms of nitrogen in plants are
(1)Inhibition of protein synthesis.
(2)delaying of flowering.
(3)inhibition of chloroplast formation.
(4)dormancy of lateral buds.

(1), (2) and (3) are correct.
(1) and (2) are correct.
(2) and(4) are correct.
(1) and (3) are correct

Which of the following statements are correct ?
(1)Solution culture/Hydroponics contains all essential minerals except one,the usefulness of which is to be deter-mined.
(2)Na, Si, Co and Selenium are beneficial element required by higher plants.
(3)Zn is the activator of nitrogenases while Mo is the activator of alcohol dehydrogenase.
(4)Zn is needed for auxin synthesis.

All of these
(1), (2) and (3)
(1), (2) and (4)
None of these

Match Column I with Column II and Column IIII

Column-I (Element)	Column-II (Function)	Column-III (Deficiency Symptom)
A.Calcium	1. Required for ionic balance.	(i)Grey blot on leaves.
B.Boron	2.Essential for constitution of nucleic acid	(ii)Fruit-yield decreases.
C.Phosphorus	3.Required for absorption of calcium.	(iii)Red blots.on leaves.
D.Chlorine	4.Required to activate respiratory enzyme.	(iv)Fruit-size diminishes
E.Manganese	5.Required for synthesis of bipolar spindle.	(v)Young root tip begin to die.

(a→1-iv); (b→2-v); (c→3-iii); (d→4-i); (e→5-ii)
(a→5-v); (b→4-iv); (c→3-i); (d→2-iii); (e→1-ii)
(a→4-iii); (b→1-iv); (c→5-v); (d→3-ii); (e→2-i)
(a→5-v); (b→3-iv); (c→2-iii); (d→1-ii); (e→4-i)

Match Column I with Column II

Column-I	Column-II
A.Mg	1.Found in some amino acids
B.S	2.Structural component ofchlorophyll
C.I	3.Not important for plants
D.Mn	4.Required for photolysis of water

A→(2); B→(1); C→(3); D→(4)
A→(1); B→(2); C→(3); D→(4)
A→(1); B→(3); C→(4); D→(2)
A→(2); B→(3); C→(1); D→(4)

The diagram shows the development of root nodule in soyabean.

Identify A, B, C & D.

A-Rhizobial bacteria; B-Cortex cell; C-Outer cortex; D-Infection thread
A-Rhizobial bacteria; B-Cortex cell; C-Inner cortex andpericycle cells; D-Infection thread
A-Rhizobial bacteria; B-Endodermal cell; C-Inner endodermis; D-Infection thread
A-Nitrosomonas bacteria; B-Cortex cell; C-Inner cortex and pericyle cells; D-Infection thread.

The given diagram shows hydroponic/soilless plant production. Plants are grown in a tubor trough placed on a slight incline. The arrows indicate the direction of flow of nutrient solution.

Nutrient solution is sent to the elevated end of the tube from the reservoir by ___________ and it flows back to the reservoir due to ________________.

pump, pump
gravity, Gravity
pump, gravity
gravity,Pump

Refer the figure given below and select the option which give correct words for A, B, C and D.

A B C D

K Ammonification Animal biomass Plant biomass
A B C D

NH₃ Ammonification Plant biomass Animal biomass
A B C D

CO₂ Denitrification Animal biomass Plant biomass
A B C D

CHO Nitrification Plant biomass Animal biomass

A	B	C	D
K	Ammonification	Animal biomass	Plant biomass

A	B	C	D
NH₃	Ammonification	Plant biomass	Animal biomass

A	B	C	D
CO₂	Denitrification	Animal biomass	Plant biomass

A	B	C	D
CHO	Nitrification	Plant biomass	Animal biomass

Which of the following elements is a constituent of biotin?

Sulphur
Magnesium
Calcium
Phosphorus

Solution

Biotin, also known as vitamin H, is a water-soluble B-vitamin. It is a coenzyme for carboxylase enzymes, involved in the synthesis of fatty acids, isoleucine, valine and in gluconeogenesis. Sulphur is a constituent of biotin.

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