VERY SHORT ANSWER QUESTION
1. Name the following
A -shaped point formed due to crossing of two non-sister chromatids of homologouis
chromosomes.
(i) The astral rays with a centriole.
A specific region where two chromatids remain joined along their length and where
(ii
genes are not found.
(iv) Division of cytoplasm.
A thread-like strand formed from a chromatin during the early stages of cell division.
(v)
(vi) The agents that stimulate cell division.
(vii) A complete set of chromosomes.
(vi The phase when DNA replication takes place.
(ix) An active phase of growth and synthetic activity in the cell.
(x) Division of nucleus during cell division.
(xi) Pairing of homologous chromosomes during meiosis.
Who proposed that new cells are formed by the division of pre-existing cells?
(xii)
(xii) A cell division in which nuclear membrane does not disappea
(xiv Cells which divide by meiosis.
(xv) Histone protein and DNA together form this structure.
Ans.
) Chiasmata (ii) Aster (ii) Centromere (iv) Cytokinesis
(v) Chromosome (vi) Mitogen (vii) Genome (vii) S phase
(ix) Interphase (x) Karyokinesis (xi) Synapsis (xii) Rudolph Virchow
(xiii) Amitosis xiv) Reproductive cells (xv) Nucleosome.
2. Complete the following statements by choosing the correct alternative out of
these given in brackets
(1) Meiosis takes place in the cells. (somatic/reproductive)
(i) Division of cytoplasm is, (Karyokinesis/ cytokinesis)
ii) In phase, no change occurs in DNA contents.(S/G1)
is essentially reserve of prophase. (Anaphase/Telophase)
(iv
(v) Movement of chromosomes occurs in (Prophase /anaphase)
(vi) V shaped chromosomes having the centromere at the centre is called
(Acrocentric/ metacentric)
(vii) Disc shaped structure found in the centromere is (Kinetochore /Chiasmata.)
(viil) DNA is a . helix structure. (Double / single)
(ix) is the longest phase of mitosis. (Prophase / Diakinesis)
x) Crossing over takes place in (Diplotene /pachytene)
, 3. Mention whether the following statements are true or talse:
() Mitosis is also known as reductional cell division.
(i) Plastids and endoplasmic reticulum disappear during prophase of mitosis and meiosis.
(11) Karyokinesis refers to the division of the nucleus.
(iv) Before undergoing cell division, the amount of DNA in the cell is reduced to half.
(v Crossing over occurs in mitosis.
(vi) In mitosis prophase is of short duration.
(vii Histone is a particular type of fatty acid.
(vii) RNA contains thymine.
(ix) Mitosis requires lesser time than meiosis.
Terminal meiosis is also known as gametic meiosis.
4. Name the type of cell division that oceurs during:
i) Growth of shoot
(i) Formation of pollen grains
(ii) Repair of worn out tissues.
Ans.
( Mitosis (i) Meiosis (ii) Mitosis.
5. Which of the following statement is associated with: prophase, metaphase,
anaphase, telophase, and interphase of mitosis?
) The nuclear membrane reappears.
(i) Chromosomes are thickest and shortest.
(ii) Chromosomes begin to coil.
(iv) Centromere divides into two.
(v Nucleus is active but chromosomes are not distinct.
(vi) Followed by cytokinesis.
(vi Each chromosome consists of two chromatids.
Ans.
() At Telophase (ii) At metaphase (ii) At prophase (v) At anaphase
(v) At interphase (vi) At telophase (vi) At anaphase.
6. Differentiate between the following:
(i) Mitosis and Meiosis (i Centrosome and Centromere
(i) Cytokinesis and Karyokinesis iv) Chiasmata and Crossing Over
(v G Phase and G2 Phase.
ANSWERS.
Mitosis Meiosis
division (a) I t is a reduction division.
|(a)| It is a n equational
(b) Two diploid daughter cell are formed (b)| Four haploid daughter cells are
formed.
(c) Only one division occurs. (c) Two divisions occur.
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