Total amount of living substances present in different levels of a chain is showed as:
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20%
Standing state
60%
Standing crop
6%
Standing state or crop
14%
All of the above
The lanthanide contraction is responsible for the fact that
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9%
Zr and Y have about the same radius
6%
Zr and Nb have similar oxidation state
83%
Zr and Hf have about the same radius
2%
Zr and Zn have the same oxidation state
Which of the following is not an actinide
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21%
Curium
22%
Californium
21%
Uranium
36%
Terbium
All the following statements about the transitional elements are true except that
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8%
All of the transitional elements are predominantly metallic
9%
In aqueous solution many of their simple ions are coloured
14%
Most of the transitional elements show pronounced catalytic activity
69%
Most of the transitional elements show only one valence state
Transitional elements exhibit variable valencies because they release electrons from the
following orbits
following orbits
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5%
ns orbit
6%
ns and np orbits
75%
(n-1)d and ns orbits
14%
(n-1) d orbit
Which of the following responsible for death of large numbers of marine animals such as fishes?
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4%
Most of the chrysophytes
2%
Slime moulds
3%
Protozoans
91%
Red dinoflagellates (Gonyaulax)
Which of the following mainly living in stagnant freshwater and instead of a cell wall, they have pellicle ?
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7%
Chrysophytes
11%
Slime moulds
5%
All Protozoans
76%
Euglenoids
Reproduce only by asexual spores known as conidia, mycelium is septate and branched, some members are saprophytes or parasites while a large number of them are decomposers of litter and help in mineral cycling :
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12%
Ascomycetes
11%
Basidiomycetes
71%
Deuteromycetes
6%
Phycomycetes
Which of the following are heterotrophs, live as predators or parasites and believed to be primitive relatives of animals?
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2%
Chrysophytes
77%
Protozoans
17%
Euglenoids
4%
Dinoflagellates
Protonema stage develops from:
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25%
Lateral bud
47%
Directly from a spore
22%
Secondary protonema
6%
Sporophytes
Which one of the following dissolve in hot concentrated NaOH solution
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22%
Fe
40%
Zn
24%
Cu
14%
Ag
According to Werner's theory
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64%
Primary valency can be ionized
15%
Secondary valency can be ionized
15%
Primary and secondary valencies both cannot be ionized
6%
Only primary valency cannot be ionized
Ziegler-Natta catalyst is an organometallic compound of which metal
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9%
Iron
21%
Zirconium
23%
Rhodium
47%
Titanium
Sodium thiosulphate is used in photography because of its
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24%
Reducing behaviour
29%
Oxidising behaviour
32%
Complex forming behaviour
15%
Reaction with light
What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic
number 25, in it's aqueous solution
number 25, in it's aqueous solution
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68%
5.92
11%
5.0
11%
Zero
10%
5.26
Which one of the following is NOT associated with blood coagulation?
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2%
Thrombin
5%
Fibrinogen
6%
Calcium
87%
Bilirubin
Semilunar valves that guard the
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62%
pulmonary artery and aorta
13%
vena cava and aorta
9%
hepatic vein and pulmonary artery
16%
pulmonary artery and vena cava
Which of the following hormone should a farmer use to spray on sugarcane crops to increase the length of sugarcane stem?
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87%
Gibberellins
6%
Auxins
5%
Cytokinin
1%
Abscisic acid
In plants synthesis of auxins occurs in
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6%
conducting tissues
89%
root and shoot tips
2%
only phloem cells
4%
only xylem cells