STD 11 - 12. Respiration in plants — NEET STD 11 Science — Question

Choose correct statement for ethylene and mark correct option :
(i) It have specific effects on cytokinesis.
(ii) It is a modified form of adenine.
(iii) It does not occur naturally in plants.
(iv) Isolated from coconut milk.
(v) It is highly effective in fruit ripening.
(vi) It enhances the respiration rate during ripening of the fruits.
(vii) It breaks seed and bud dormancy, initiates germination in peanut seeds, sprouting of potato tubers.

What is the fate of the male gametes discharged in the synergid?

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.

Statement I: Development is a term that includes all changes that an organism goes through during its life cycle from germination of the seed to senescence.
Statement II: Plants follow different pathways in response to environment or phases of life to form different kinds of structures, this ability is called plasticity.

Select the correct statements

Photorespiration takes place is

In geometrical growth, lag phase is represented by

Which one process is only concerned with the transcription