71. In the plant cell, cytokinesis occurs by
A. Separation of the cytoplasm from the periphery to central region.
B. Separation of the cytoplasm throughout the equatorial plane simultaneously
C. Separation of the cytoplasm from cell centre to its periphery
D. Following of cytoplasm from two side at right angles to the plane of spindle pole
Answer : Option C
72. Cytokinesis is generally, but not always, seen in mitosis. If cells undergo mitosis and do not follow cytokinesis then it would result in :
A. Cells with abnormal small nuclei
B. Ensuring genetic homogeneity of cell
C. A cell with a single large nucleus
D. A cell with two or more nuclei
Answer : Option D
73. How many time is the genetic material replicated during meiosis ?
74. How does the pairs of homologous chromosomes appear during zygotene phase ?
75. In which of the following stages chromosomes are not seen clearly ?
76. During prophase – I of meiosis homologous chromosomes pair with each other to form bivalent.A bivalent is an association of :
A. Two chromatids and two centromeres
B. Four chromatids and four centromeres
C. Four chromatids and two centromeres
D. Two chromatids and one centromere
Answer : Option C
77. Crossing over involves.......
A. Duplication of chromosomes
B. Deletion of chromosomes
C. Exchange of genetic matetial
D. Addition of chromosome
Answer : Option C
78. Crossing over occurs between.......
A. Non – homologous chromatids of non homologous chromosomes
B. Non – sister chromatids of homologous chromosomes
C. Sister chromatids of homologous chromosomes
D. Sister chromatids of non homologous chromosome
Answer : Option B
79. During meiosis centromere divides :
A. Only one at anaphase - II
B. (b) Only once at anaphase – I
C. Twice in meiosis – I & II
D. Twice in each cell at the end of anaphase – I & II
Answer : Option A
80. Which of the following occurs only during meiosis ?
A. Pairing of homologous chromosomes
B. Separation of duplicated stands
C. Cytokinesis
D. Disappearance of nucleolus
Answer : Option A