Question

'A student observed a plant cell under microscope
containing more than two complete sets of
chromosomes'. What would be the possible reason
of above phenomenon?
(1) Non disjunction of chromosomes
(2) Failure of cytokinesis after karyokinesis
(3) Absence of cell plate formation
(4) Both (2) and (3)​

Answer 1

Answer:

(4) The right answer is the 4th one 2nd and 3rd both

Explanation:

if the cytokineses does not occur after the karyokinesis, both of the sets of the chromosomes will be there in the cell.

if there is no cell plate present in the divided cells then again both of the sets of the cells will be seen in the microscope.

Answer 2

The possible reason behind the cell containing more than two complete sets of chromosomes is either the failure of cytokinesis after karyokinesis or the absence of cell plate formation.

Option D

Explanation:

• If the cytokinesis does not occur after karyokinesis, the nucleus will be divided but the cell division would not take place.

• Otherwise, if there is no presence of cell plate present in the divide cells, then the presence of both the cells will be clearly observed in the microscope.