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What was the primary reason Bohr's model could not be generalized to complex atoms?
The text states: 'The reason for this was soon discovered. In Bohr model, an electron is regarded as a charged particle moving in a well defined circular orbit about the nucleus. The wave character of the electron is ignored in Bohr’s theory.'
In the modern quantum mechanical model, replacing Bohr's orbits, where are electrons most likely to be found?
The text says: 'The orbital picture in Bohr’s model of the hydrogen atom was inconsistent with the uncertainty principle. It was replaced by modern quantum mechanics in which Bohr’s orbits are regions where the electron may be found with large probability.'
Which of the following levels of organization is first observed in Phylum Platyhelminthes?
According to NCERT, 'A still higher level of organisation, i.e., organ level is exhibited by members of Platyhelminthes and other higher phyla where tissues are grouped together to form organs, each specialised for a particular function.'
Identify the type of body symmetry present in Platyhelminthes.
The summary states, 'The platyhelminths have flat body and exhibit bilateral symmetry.' Also, Table 4.2 lists 'Bilateral' under Symmetry for Platyhelminthes.
What is the nature of the coelom in Platyhelminthes?
While not explicitly stated as 'acoelomate' in the provided text, the NCERT Table 4.2 lists 'Absent' under Coelom for Platyhelminthes, implying they are acoelomates.
Which of the following distinctive features is characteristic of parasitic Platyhelminthes?
The summary explicitly mentions, 'The parasitic forms show distinct suckers and hooks.' Additionally, Table 4.2 lists 'Flat body, suckers.' as distinctive features for Platyhelminthes.
What kind of digestive system is typically found in Platyhelminthes?
Table 4.2 in the NCERT text specifies 'Incomplete' under 'Digestive System' for Platyhelminthes.
Which of the following organ systems is absent in Platyhelminthes, according to the provided table?
Table 4.2 clearly states 'Absent' under 'Circulatory System' for Platyhelminthes. Reproductive and Nervous systems are implied to be present as they exhibit 'organ level' organization, and digestion is incomplete, not absent.
Platyhelminthes are described as having a 'flat body'. What is the biological term for this characteristic?
The summary mentions 'The platyhelminths have flat body'. In biology, a 'flat body' specifically refers to being dorsoventrally flattened.
Based on the organization level, Platyhelminthes are considered 'higher' than which of the following phyla?
The text states, 'In coelenterates, the arrangement of cells is more complex. Here the cells performing the same function are arranged into tissues, hence is called tissue level of organisation. A still higher level of organisation, i.e., organ level is exhibited by members of Platyhelminthes.' This indicates Platyhelminthes have a higher organization level than Coelenterates.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.