STD 11 - 2. Biology classification — NEET STD 11 Science — Question

Which of the following is the source of respiration

Which factor determines the direction of movement of main root and stem?

Which of the following statements are correct for replication ?
(i) Watson and Crick proposed the semi- conservative scheme of DNA replication.
(ii) M. S. Meselson and F. W. Stahl proved semi- conservative scheme with E. coli growing in isotopic 14C.
(iii) Taylor and colleagues in 1958 proved semi- conservative replication of chromosomes by use of radioactive Thymidine in Vicia faba (faba beans).
(iv) In living cells, such as E.coli, the process of replication requires DNA-dependent DNA polymerase.
(v) Replication does not initiate randomly at any place in DNA.
(vi) The DNA-dependent DNA polymerases catalyse polymerisation only in one direction.
(vii) Any mistake during replication would result into mutations.

Degree of biodiversity increases from

Where oxidative phosphorylation is occur ?

A fibre derived from a tracheid is

Identify pteridophyte

Select an incorrect statement w.r.t. cell cycle

It is example of recently extinction animal.