Cytokinesis

Q. Discuss how the property of plant cell totipotency has been utilised for plant propagation and improvement.

Q.

Liquid endosperm in coconut is formed as a result of

1. cytokinesis
2. absence of karyokinesis
3. cytokinesis not followed by karyokinesis
4. karyokinesis not followed by cytokinesis

Q.

Fill in the gaps:
Reabsorption of water from distal parts of the tubules is facilitated by
hormone ___

Q. Exchange of segments between non sister chromatids of homologous chromosomes is called

1. synapsis
2. terminalization
3. crossing over
4. none of these

Q. What is cell cycle and what are its phases?

Q. Name an organism where cell division in itself is mode of reproduction.

Q. Do plants grow throughout their life?

Q. Can animals show mitotic divisions​ in haploid cells?

Q.

Cytoplasmic inheritance is due to

(1) Mitochondria

(2) Cilia

(3) Cytoplasmic particles

(4) Cell wall

1. 1, 2 and 3 are correct.

2. 1 and 2 are correct.

3. 2 and 4 are correct.

4. 1 and 3 are correct.

Q. Which of the following cellular structures always disappears during mitosis and meiosis?

1. Plastid and nuclear membrane
2. Nucleolus and nuclear membrane
3. Endoplasmic reticulum and plasma membrane
4. Endoplasmic reticulum and mitochondria

Q. Recombination occurs during _______ stage of meiosis-I.

1. leptotene
2. pachytene
3. zygotene
4. diplotene

Q.

Which of the following organelles will be distributed between daughter cells during cytokinesis?

1. Plastids and ER

2. ER and Golgi complex

3. Mitochondria and plastids
   

4. Plastids and vacuoles

Q.

A form of asexual reproduction used by a single-celled organism to produce two identical daughter cells.

1. multiple fission

2. binary fission

3. fragmentation

4. regeneration

Q. Which of the following is a copper containing protein acting as a mobile electron carrier in thylakoid membrane?

1. Pheophytin
2. Plastocyanin
3. Plastoquinone
4. Cytochrome ${\text{b}}_6$

Q.

Question 37
How does cytokinesis in plant cells differ from that in animal cells?

Q. Cells that enter an inactive stage called quiescent stage (G${}_0$) of the cell cycle:

1. Are metabolically inactive
2. Do not proliferate
3. Do not respire
4. Cannot divide ever in future

Q. Linked genes can get segregated during the _______ stage of meiosis-I.

1. Diakinesis
2. pachytene
3. zygotene
4. diplotene

Q.

Write about changes in the chromosome number during cell division.

Q. At which phase of division, organelles like mitochondria and plastids get distributed between two daughter cells?

1. Telophase
2. Interphase
3. Cytokinesis
4. Anaphase

Q.

What are the benefits of euglena?

Q.

Distinguish cytokinesis from karyokinesis.

Q. Which of the following occurs post karyokinesis during mitosis in plant cells?

1. Disappearance of nuclear envelope
2. Cell plate formation
3. Replication of DNA
4. Condensation of chromatin

Q.

There is no DNA in

1. Hair root

2. An enucleated ovum

3. A mature spermatozoan

4. A mature RBC

Q. Plane at which the new cell wall is formed during cell division is determined by

1. microfilaments
2. microtubules
3. Golgi apparatus
4. nucleus

Q.

At which stage do the chromosome get aligned at the equator ?

Q. Two chormosomes that are held together are called sister chromatids do they have same genes also ?

Q.

How does cytokinesis in plant cells differ from that in animal cells?

Q. The diagram represents a eukaryotic cell cycle divided into 5 phases (A-E).


Match phases A-E of the diagram with the processes 1-5 given below.
1. Involves cytokinesis
2. Main growth period of the cell
3. Duplication of DNA
4. Quiescent cells
5. Last stage of interphase

1. A-2, B-3, C-5, D-1, E-4
2. A-3, B-2, C-1, D-4, E-5
3. A-1, B-2, C-3, D-4, E-5
4. A-4, B-5, C-3, D-1, E-2

Q. Complete linkage phenomena can be observed in which of the following?

I. Male Drosophila
II. Female Drosophila
III. Heterogametic organisms
IV. Homogametic organisms

1. II only
2. II and IV only
3. I only
4. I and III only

Q. Match the columns and select the correct option.

$\begin{array}{cccc}& \text{Column-I}& & \text{Column-II}\\ \text{(a)}& \text{Zygotene}& \text{(i)}& \text{Recombination between homologous chromosomes}\\ \text{(b)}& \text{Diplotene}& \text{(ii)}& \text{Formation of synaptonemal complex}\\ \text{(c)}& \text{Pachytene}& \text{(iii)}& \text{Terminalisation of chiasmata}\\ \text{(d)}& \text{Diakinesis}& \text{(iv)}& \text{Chiasmata formation}\end{array}$

1. (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)
2. (a) - (iii), (b) - (i), (c) - (ii), (d) - (iv)
3. (a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)
4. (a) - (i), (b) - (iv), (c) - (ii), (d) - (iii)