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Which of the following helps in maintenance of the pressure gradient in sieve tubes?
Which of the following ecological pyramids is generally inverted?
The rate of decomposition is faster in the ecosystem due to the following factors, except:
Which of the following statements is incorrect?
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
Which of the following statements is not correct?
In the equation GPP – R = NPP, R represents:
The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called:
Dalton's law of partial pressure is applicable to which of the following gaseous mixture?
Identify the incorrect statement from the following
Kjeldahl method is used to estimate the amount of nitrogen in which one of the following compounds?
At 298 K, the standard electrode potentials of $Cu^{2+}/Cu$, $Zn^{2+}/Zn$, $Fe^{2+}/Fe$ and $Ag^{+}/Ag$ are 0.34 V, -0.76 V, -0.44 V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reaction cannot occur?
Given below are two statements: Statement I: The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group. Statement II: o-nitrophenol, m-nitrophenol and p-nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring. In the light of the above statements, choose the most appropriate answer from the options given below:
Which statement regarding polymers is not correct?
Match List -I with List -II List -I (a) Li (b) Na (c) KOH (d) Cs List -II (i) absorbent for carbon dioxide (ii) electrochemical cells (iii) coolant in fast breeder reactors (iv) photoelectric cell Choose the correct answer from the options given below:
Given below are two statements Statement I: Primary aliphatic amines react with $HNO_2$ to give unstable diazonium salts. Statement II: Primary aromatic amines react with $HNO_2$ to form diazonium salts which are stable even above 300 K. In the light of the above statements, choose the most appropriate answer from the options given below
Given below are two statements Statement I: In the coagulation of a negative sol, the flocculating power of the three given ions is in the order $Al^{3+} > Ba^{2+} > Na^+$ Statement II: In the coagulation of a positive sol, the flocculating power of the three given salts is in the order $NaCl
What mass of 95% pure $CaCO_3$ will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction? $CaCO_{3(s)} + 2HCl_{(aq)} \rightarrow CaCl_{2(aq)} + CO_{2(g)} + 2H_2O_{(l)}$ [Calculate upto second place of decimal point]
Frugivorous birds are found in large numbers in tropical forests mainly because of :
Given below are two statements: Statement I: Pyramid of energy is always upright and is the most efficient. Statement II: Pyramid of biomass in sea is generally inverted. In the light of the above statements, choose the most appropriate answer from the options given below: