Page 1 : 20., , 23,, , Alignment of bivalents on equatorial plate, occurs during [NCERT Pg. 168], , (1) Metaphase of mitosis, (2) Metaphase II, , (3) Prophase |, , (4) Metaphase |, , _ The cells that do not divide further, , [NCERT Pg.164], a. Exit Gi phase, b. Enter an active phase, c. Become metabolically inactive, , (1) a only (2) a and b only, (3) a and c only (4) Alla, b andc, A- A __ is marked by the initiation of, , condensation of chromosomal material., B- B, of spindle fibres., , serve as the site of attachment, [NCERT Pg. 164], (1) A- Metaphase, B — Kinetochore, , (2) A—Prophase, B — Centromere, , , , (3) A— Telophase, B — Centromere, (4) A- Prophase, B — Kinetochore, , Arrange these events in their correct, sequence of occurrence in meiosis of a, plant cell [NCERT Pg. 166, 168], a. Formation of X-shaped structure., , b. Attachment of, kinetochore of, chromosomes., , ¢. Recombinase activity, d. Cell plate formation, , microtubules to, homologous, , 24., , 25., , 26., , (1) c, a, d and b, (2) d, a, b andc, (3) c, a, b andd, (4) b,c, aandd, All of the following characteristics mark the, completion of prophase, except, [NCERT Pg. 164], (1) Condensation of chromosomal material, , (2) Movement of centrosome towards, , opposite poles, (3) Disappearance of golgi and ER, , (4) Attachment of, kinetochores, , spindle fibres to, , Choose the incorrect one for cytokinesis, [NCERT Pg. 166], , (1) In animals it is achieved by furrow, formation, , (2) Involves distribution of plastids and, mitochondria, , (3) In both plants and animals cytokinesis, begins at centre and progresses to, periphery, , (4) It is the final stage of cell division, , Mitosis does not help to/in, , [NCERT Pg. 167], , (1) Restore nucleocytoplasmic ratio, , (2) Cell repair, , (3) Growth of plant, , (4) Increase the genetic variability, , 27., , 28., , 29., , A- Synaptonemal complex forms in, pachytene and dissolve in diplotene, stage., , B - The final stage of meiosis | is diakinesis, [NCERT Pg.168], , (1) Only A is incorrect, , (2) Only B is incorrect, , (3) Both A and B are incorrect, , (4) Both A and B are correct, , The mitotic metaphase is different from, metaphase | as former, , [NCERT Pg. 165, 169], , (1) Involves alignment of chromosomes pair, at equator, , (2) Involves attachment of spindle fibres to, kinetochore, , (3) Involves formation of single metaphasic, plate, , (4) Always occur in diploid cells, , Read below given flow chart and choose the, correct option for it [NCERT Pg. 166], , A-—B- Pre mitotic gap phase, — C > Metaphase > D>E, (1) A — Initiation of DNA replication, , (2) C — Chromosome movement to spindle, equator, , (3) B — Chromosome number gets double, , (4) E — Nucleolus reappear