Which of the following statements is false?
1. | Mitosis or the equational division is usually restricted to the 2N cells only |
2. | In onion 2N = 16 |
3. | Growth and reproduction are characteristics of cells indeed of all living organism |
4. | In plants meristematic tissues show meiosis |
At metaphase of mitosis, each chromosome consists of _______ chromatid(s) _______ centromere(s) ________ kinetochore(s) and _______ molecules of DNA:
(1) 2, 1, 2, 2
(2) 2, 2, 2, 2
(3) 2, 1, 1, 1
(4) 2, 1, 2, 1
In human cells chromosomes are:
1. | Always condensed during the entire cell cycle |
2. | Different in different tissues |
3. | Of the same size and shape |
4. | Visible only during mitosis and meiosis |
In prophase mitosis, which one of the following events occurs in animal cells but not in plant cells?
1. | Centrioles migrate to opposite sides of the nucleus |
2. | Homologous chromosomes do not associate |
3. | The nuclear envelope (membrane) breaks down |
4. | Nucleoli disappear |
Synaptonemal complex is more conspicious at:
(1) Zygotene
(2) Pachytene
(3) Diplotene
(4) Leptotene
Centrosomes are:
1. | Constricted regions of chromosomes |
2. | Regions where microtubules polymerise |
3. | Part of Cilia |
4. | The central part of the same cell |
Cellular structures which disappear during late prophase and reappear during telophase are:
(1) Mitochondria and spindle fibres
(2) Plasma membrane
(3) Nuclear membrane and nucleolus
(4) Plastid
Given:
1. Chromatid
2. Monad
3. Dyad
4. Daughter chromosome
The correct sequence in cell division is:
1. 1, 2, 3, 4
2. 2, 3, 1, 4
3. 3, 2, 1, 4
4. 4, 3, 2, 1
Cytokinesis in animal cell takes place by _______; in _______ direction while in plant cell by _______; in _______ direction:
(1) Furrowing, centrifugal, cell plate, centripetal
(2) Furrowing, centripetal, cell plate, Centrifugal
(3) Cell plate, centrifugal, furrowing, centripetal
(4) Cell plate, centripetal, furrowing, centrifugal
Liquid endosperm in coconut is resulted due to:
(1) Karyokinesis followed by cytokinesis
(2) Failure of karyokinesis followed by cytokinesis
(3) Karyokinesis twice followed by single cytokinesis
(4) Karyokinesis is not followed by cytokinesis