In the taxonomic categories which hierarchical arrangement in ascending order is correct in case of
animals?
Explanation:
The correct ascending order in taxonomy is: Kingdom, Phylum, Class, Order, Family, Genus, Species. This sequence is the standard hierarchical arrangement described in NCERT biology for animals. Each level becomes more specific from broad grouping (Kingdom) to the most specific (Species).
π§ Did You Know?
Each level shares common characteristics; for example, organisms in the same phylum share fundamental body plans, while those in the same species can usually interbreed.
π‘ NCERT Memory Line:
King Philip Came Over For Good Soup (Kingdom, Phylum, Class, Order, Family, Genus, Species).
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): All vertebrates are chordates but all chordates are not vertebrates. Reason (R): Notochord is replaced by vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the option given below :
Explanation:
Statement A is true: every vertebrate is a chordate, but not every chordate is a vertebrate. Statement R is true: in vertebrates, the notochord is replaced by the vertebral column during development. However, R does not explain why vertebrates are chordates; it explains a developmental change within vertebrates. Therefore, both are correct, but R is not the direct explanation of A. The correct option is 2.
π§ Did You Know?
In many vertebrates, the notochord is replaced by the vertebral column, but remnants may persist as intervertebral discs.
π‘ NCERT Memory Line:
βAll vertebrates are chordates, but all chordates are not vertebrates. In vertebrates, the notochord is replaced by the vertebral column.β
Given below are two statements: Statement I: Mycoplasma can pass through less than 1 micron filter size. Statement II: Mycoplasma are bacteria with cell wall.
In the light of the above statements, choose the most appropriate answer from the options given below
Explanation:
Statement I is correct: Mycoplasma are very small bacteria that can pass through filters with pore sizes less than 1 micron (e.g., 0.45 ΞΌm). Their lack of a cell wall contributes to their flexible shape and small size. Statement II is incorrect: Mycoplasma do not have a cell wall; NCERT states they are the smallest bacteria that lack a cell wall. Therefore, the correct choice is: Statement I is correct but Statement II is incorrect.
π§ Did You Know?
Because they lack cell walls, Mycoplasma are resistant to many antibiotics that target cell wall synthesis (like penicillin), and they have variable shapes due to their membrane-rich structure.
π‘ NCERT Memory Line:
Mycoplasma are the smallest bacteria that lack cell walls.
