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If the respiratory quotient (RQ) for a substrate is 0.9, what type of respiratory substrate is most likely being utilized?
The NCERT mentions, 'When proteins are respiratory substrates the ratio would be about 0.9.'
Why are there significant differences in the gas exchange mechanisms between plants and animals?
The text explains, 'Plants, unlike animals, have no specialised organs for gaseous exchange... There are several reasons why plants can get along without respiratory organs. First, each plant part takes care of its own gas-exchange needs... Second, plants do not present great demands for gas exchange. Roots, stems and leaves respire at rates far lower than animals do.'
Which of the following statements about anaerobic conditions mentioned in the context is true?
The text states, 'Even among present-day living organisms, we know of several that are adapted to anaerobic conditions.'
Carbohydrates are the most common respiratory substrates. What is their Respiratory Quotient (RQ) when completely oxidized?
The NCERT states, 'When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of $CO_2$ and $O_2$ are evolved and consumed, respectively, as shown in the equation below: $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + Energy$ . Thus, RQ = $6/6 = 1$.'
Which of the following physicists proposed the hypothesis that material particles also have a dual (wave-like) nature, providing an explanation for Bohr's second postulate?
The text states: 'The French physicist Louis de Broglie explained this puzzle in 1923, ten years after Bohr proposed his model.' and 'We studied, in Chapter 11, about the de Broglie’s hypothesis that material particles, such as electrons, also have a wave nature.'
Bohr's second postulate of quantization states that the angular momentum of an electron orbiting the nucleus is quantised. Which of the following expressions correctly represents this postulate?
The context explicitly states: '(that is, $L_n = nh/2\pi$; n = 1, 2, 3 …).'
In de Broglie's explanation of Bohr's quantization, the electron in its circular orbit is viewed as a:
The context says: 'Louis de Broglie argued that the electron in its circular orbit, as proposed by Bohr, must be seen as a particle wave.'
According to de Broglie's hypothesis, for an electron to reside in a stable orbit, the circumference of the orbit must be equal to what, in terms of its de Broglie wavelength ($\lambda$)?
The text states: 'De Broglie’s hypothesis...gave an explanation for Bohr’s quantised orbits by bringing in the wave-particle duality. The orbits correspond to circular standing waves in which the circumference of the orbit equals a whole number of wavelengths.' This is mathematically represented as $2\pi r_n = n\lambda$.
Which of the following scientists experimentally verified the wave nature of electrons?
The context mentions: 'C. J. Davisson and L. H. Germer later experimentally verified the wave nature of electrons in 1927.'
The de Broglie wavelength ($\lambda$) of a particle with momentum ($p$) is given by the relation:
The context explicitly states: 'From Chapter 11, we have $\lambda = h/p$, where $p$ is the magnitude of the electron’s momentum.' and also in the 'DUAL_NATURE_OF_RADIATION_AND_MATTER' chapter: 'The de Broglie wavelength ($\lambda$) associated with a moving particle is related to its momentum $p$ as: $\lambda = h/p$.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.