In the taxonomic categories which hierarchical arrangement in ascending order is correct in case of
animals?
AI-generated explanation. Check against your textbook.
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).
🧠 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.
💡 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 :
AI-generated explanation. Check against your textbook.
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.
🧠 Did You Know?
In many vertebrates, the notochord is replaced by the vertebral column, but remnants may persist as intervertebral discs.
💡 NCERT Memory Line:
“All vertebrates are chordates, but all chordates are not vertebrates. In vertebrates, the notochord is replaced by the vertebral column.”
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
AI-generated explanation. Check against your textbook.
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 μm). 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.
🧠 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.
💡 NCERT Memory Line:
Mycoplasma are the smallest bacteria that lack cell walls.