Page 51 - Biology - XII

Q17. Which cell division in plants helps in formation of microspores?
Ans. Meiosis

Q18. Name the subdivisions of prophase I of meiosis I.
Ans. Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis

Q19. What is leptotene stage?
Ans. It is the fi rst stage of prophase I of meiosis cell division.
Q20. Name the type of microsporogenesis that occurs in tetrahedral tetrad formation.
Ans. Simultaneous type

Q21. Which part of meiosis retains the same chromosome number as that of the parent-II?
Ans. Meiosis-II
Q22. How many sets of chromosomes does metaphase I have?
Ans. One

Q23. Mention the number of daughter nuclei at telophase.
Ans. Two
Q24. What are the products of telophase/meiosis called?
Ans. Meiocytes, gametes, microspores/megaspores

Q25. How many types of meiosis are there in plants?
Ans. Three types

COMPETENCY BASED QUESTIONS

Multiple Choice Questions

Q1. Separation of paired chromosomes in meiosis I is called

(a) diplotene (b) diakinesis (c) metaphase I (d) anaphase I
Q2. Tetrad condition of chromosomes in meiosis in seen during
(a) meiosis I (b) meiosis II (c) pachytene (d) diakinesis

Q3. What will be the chromosome number of the cells after meiosis II, if the initial chromosome
number is 46?
(a) 46 (b) 16 (c) 26 (d) 23

Q4. The chromosome number of the parent cell in oogenesis will be
(a) 23 (b) 46 (c) 47 (d) 48
Q5. The parent cell after reduction division will have ______________ in second division.

(a) no chromosomes (b) half number of chromosomes
(c) one and half chromosome number (d) twice the chromosome number
Q6. The parent cell is of germinal epithelium of a gonad. The chromosome number will be

(a) diploid (b) 2n (c) (a) and (b) (d) n
Q7. The division of nucleus during a cell division is called
(a) prophase (b) telophase (c) cytokinesis (d) karyokinesis

50