Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Why do viruses with an RNA genome and shorter lifespan tend to mutate and evolve faster?
The text explains: 'Both DNA and RNA are able to mutate. In fact, RNA being unstable, mutate at a faster rate. Consequently, viruses having RNA genome and having shorter life span mutate and evolve faster.'
Which of the following statement is true regarding the relationship between DNA and RNA in protein synthesis (translation)?
The text states: 'RNA can directly code for the synthesis of proteins, hence can easily express the characters. DNA, however, is dependent on RNA for synthesis of proteins. The protein synthesising machinery has evolved around RNA.'
What is the structural difference between DNA and RNA mentioned in the context, besides the sugar and base composition?
The text states: 'The structure of DNA is a double strand whereas RNA is a single strand molecule.' This is a key structural difference.
Considering the 'RNA World' hypothesis, which essential life processes are suggested to have evolved around RNA?
The 'RNA World' section mentions: 'There is now enough evidence to suggest that essential life processes (such as metabolism, translation, splicing, etc.), evolved around RNA.'
Why is DNA considered chemically less reactive and structurally more stable compared to RNA?
The text clearly states: 'Further, 2'-OH group present at every nucleotide in RNA is a reactive group and makes RNA labile and easily degradable. ... Therefore, DNA chemically is less reactive and structurally more stable when compared to RNA.'
Nucleic acids are polymers of nucleotides. A nucleotide is composed of:
The chemistry context states: 'Nucleic acids are the polymers of nucleotides which in turn consist of a base, a pentose sugar and phosphate moiety.'
Which of the following statements about apomixis is INCORRECT?
The NCERT text states: 'Although seeds, in general are the products of fertilisation, a few flowering plants such as some species of Asteraceae and grasses, have evolved a special mechanism, to produce seeds without fertilisation, called apomixis.' Therefore, apomictic seeds are not generally a result of fertilization, but rather formed without it.
Polyembryony, the occurrence of more than one embryo in a seed, is observed in which of the following plants according to the provided text?
The text mentions: 'More often, as in many Citrus and Mango varieties some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into the embryos. In such species each ovule contains many embryos. Occurrence of more than one embryo in a seed is referred to as polyembryony.'
In apomixis, what is the fate of the reduction division (meiosis) in the formation of the egg cell?
The NCERT text states: 'In some species, the diploid egg cell is formed without reduction division and develops into the embryo without fertilisation.' This indicates that reduction division is sometimes absent.
Which of the following events is bypassed in the formation of an apomictic seed?
Apomixis is defined as a 'special mechanism, to produce seeds without fertilisation'. All other options are generally outcomes or parts of seed development that can occur even in apomixis.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.