Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What type of mutation results from a change in a single base pair of DNA?
According to the NCERT text: 'mutation also arise due to change in a single base pair of DNA. This is known as point mutation.'
Sickle cell anemia is a classical example of which type of mutation?
The NCERT text explicitly states: 'A classical example of such a mutation is sickle cell anemia', referring to point mutation from the previous sentence.
Deletions and insertions of base pairs of DNA are responsible for causing which type of mutation?
The NCERT text mentions: 'Deletions and insertions of base pairs of DNA, causes frame-shift mutations'.
What are chemical and physical factors that induce mutations collectively referred to as?
The NCERT text states: 'However, there are many chemical and physical factors that induce mutations. These are referred to as mutagens.'
Which of the following is an example of a physical mutagen mentioned in the context?
The context provides: 'UV radiations can cause mutations in organisms – it is a mutagen.' This identifies UV radiation as a physical mutagen.
Mutation leads to changes in which of the following aspects of an organism?
The NCERT text defines mutation as: 'a phenomenon which results in alteration of DNA sequences and consequently results in changes in the genotype and the phenotype of an organism.'
The loss or gain of a segment of DNA leads to an alteration in chromosomes. These chromosomal alterations are also known as:
The text states: 'Therefore loss (deletions) or gain (insertion/duplication) of a segment of DNA, result in alteration in chromosomes. Since genes are known to be located on chromosomes, alteration in chromosomes results in abnormalities or aberrations. Chromosomal aberrations are commonly observed in cancer cells.'
Which of the following equations accurately represents exponential population growth?
The context states: 'If in a population of size N, the birth rates (not total number but per capita births) are represented as b and death rates (again, per capita death rates) as d, then the increase or decrease in N during a unit time period t (dN/dt) will be dN/dt = (b – d) × N. Let (b–d) = r, then dN/dt = rN.' This is the equation for exponential growth.
The 'intrinsic rate of natural increase' (r) is a crucial parameter in population growth. What does 'r' specifically represent in the context of the exponential growth model?
The context defines 'r' as: 'Let (b–d) = r'. Here, 'b' represents per capita birth rates and 'd' represents per capita death rates. Therefore, 'r' is the per capita birth rates minus the per capita death rates.
Which of the following conditions is essential for a population to exhibit exponential growth?
The context states: 'Ideally, when resources in the habitat are unlimited, each species has the ability to realise fully its innate potential to grow in number... Then the population grows in an exponential or geometric fashion.' This clearly indicates that unlimited resources are essential for exponential growth.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.