PART - 1 - Unit III : CH - 10 Cell Cycle and Cell Division BIOLOGY - PART - 1 - Unit III : CH - 10 Cell Cycle and Cell Division

The cells and blood cells of the inner surface of the alimentary canal are continuously replaced, whose contribution is in this?

The growth of multicellular organisms occurs due to which of the following?

Cell plate is called:

Spindle fibres are made of:

Which sequence of phases is correct in relation to the cell cycle?

Which of the words given for the following statements are the related words (i) Prophase,(ii) Metaphase,(iii) Anaphase,(iv) Telophase.
(a) Nuclear membrane reappears.
(b) Chromosomes are the thickest and smallest.
(c) Chromosomes start coiling.
(d) The chromosome divides into two at the centromere.
(e) Pre-stage of cytokinesis.
(f) Each chromosome is made up of two chromatids/ half chromosomes.

Name the phase of nuclear division which is described by each of the following sentences:
(i) Disappearance of nuclear membrane.
(ii) Reappearance of nuclear membrane and nucleus.
(iii) Due to division of centromere and shortening of spindle fibres, chromatids reach towards opposite poles.
(iv) Chromosomes establish themselves on the equatorial plate of spindle and spindle fibres get attached to the centromere.

Give a specific scientific term for the following statements:
(a) The point at which two daughter half- chromosomes/daughter chromatids are joined together.
(b) Nuclear division.
(c) The time interval between two successive mitotic divisions.
(d) A process of cell division in which the number of chromosomes is reduced to half, which is followed by cytoplasmic division.
(e) That stage of the cell cycle in which mainly synthesis of proteins and RNA takes place.

The cell found in the apical cell keeps dividing throughout its life? So, what are they called?

Write the names of any two phases of interphase.

Write any four importance of mitosis.

Define meiosis. Describe the leptotene phase.

Define cytoplasmic division or cytokinesis and write any two differences between cytoplasmic division of animal and plant cells.

What effect does crossing over have on inheritance? Explain briefly.

Write any four differences between mitosis of animal and plant cells.

Write the difference between first meiosis and second meiosis.

Explain the difference between the initial stages of mitosis and meiosis.

What is mitosis? Explain cytoplasmic division.

Draw a picture and describe Meiosis-1 and Meiosis-II

Compare mitosis with meiosis.

Describe the process of meiosis with the help of pictures.

Define mitosis. Describe its different phases by drawing them.

Onion root cells contain ___________ chromosomes.

During ___________ the four chromatids of each bivalent chromosomes becomes distinct and clearly appears as tetrads.

___________ occurs by recombination of genetic material in two chromosomes.

There is a combination of two ___________ in the formation of offspring through sexual reproduction.

In some social insects haploid cells also divide by ___________.

In the diakinesis phase, chiasmata begin to end.

The state between two meiotic divisions is not called inter-kinesis.

Interphase is the most active stage in cell division.

Spindle fibres are made of cellulose.

In meiosis, crossing over is found in the pachytene stage.