Class 11 Biology MCQ Questions of Cell Cycle and Cell Division with Answers examine the significant insights concerning the cycles in all living creatures canvassed in cell division. These NCERT arrangements are comprehended relating to specific rules which are to be trailed by understudies as recommended by the CBSE board. This guarantees that understudies are improved with the approach that upgrades their theoretical information.
Students can go through the Important MCQ Questions for Class 11 Biology. By practicing these questions, understudies will get knowledgeable with this chapter and set it up altogether. After this, they can have the option to respond to even the troublesome Questions in the test. Along these lines, they should go through the Important Objective Questions Class 11 Cell Cycle and Cell Division.
Students can solve these MCQ Questions of Cell Cycle and Cell Division Class 11with answers and Check their preparation level. These Class 11 MCQ Questions with answers clear for a speedy correction of the Chapter.
1. Cell plate grows from
(a) walls to the centre
(b) centre to the walls
(c) in patches
2. During which stage the chromosomes first become visible.
3. How many chromosomes are there in the onion root tip cells?
4. The stage in which daughter chromosomes move toward the poles of the spindle is
5. If you are provided with root-tips of onion in your class and are asked to count the chromosomes which of the following stages can you most conveniently look into:
6. In mitosis, the nuclear envelope and nucleolus disappear during
7. Chromosome duplication without nuclear division refers to
8. Recombination of genes occur at
(a) prophase I in meiosis
(b) prophase II in meiosis
(c) metaphase II in meiosis
(d) prophase in mitosis
9. The stage between two meiotic divisions is called interkinesis and
(a) Is generally short-lived and followed by prophase II
(b) Involves duplication of genes and centrioles
(c) Is followed by prophase I
(d) Is long-lived
10. Lampbrush chromosomes are seen in which typical stage?
(a) Meiotic prophase
(b) Mitotic prophase
(c) Mitotic anaphase
(d) Mitotic metaphase
11. Nucleoproteins are synthesized in
(b) nuclear envelope
12. Segregation of Mendelian factor (Aa) occurs during
13. Experiments on Acetabularia by Hammerling proved the role of
(a) cytoplasm in controlling differentiation
(b) nucleus in heredity
(c) chromosomes in heredity
(d) nucleo-cytoplasmic ratio
14. The point, at which polytene chromosomes appear to be attached togethe
r, is called
15. Chromatids coiling in the meiotic and mitotic division is…………
(a) Plectonemic in both
(b) Paranemic in both
(c) Paranemic in mitosis and plectonemic in meiosis
(d) Plectonemic in mitosis and paranemic in meiosis
16. Chromosome structure can be observed best during……….
(d) None of the above
17. The exchange of segments of two non-homologous pair of chromosomes is termed as
(a) Crossing over
18. The exchange of segments of non-sister chromatids between chromosomes of a homologous pair termed as
(c) crossing over
(d) chromosomal aberration
19. Calcium-dependent Kinases can control
(a) cell cycle activities
(b) DNA replication
(c) Cell surface receptors
(d) membrane structure
20. Many cells function properly and divide mitotically even though they do not have
(a) Plasma membrane
21. The stage which serves as a connecting link between meiosis 1 and meiosis 2
(a) Interphase 2
(b) Interphase 1
(d) None of the above
22. If an individual wants to view diakinesis, which of these would be
(c) Onion root
(d) Flower bud
23. Best material for the study of mitosis in a laboratory is
(b) root tip
(c) leaf tip
24. During which phase of meiosis do Tetrads form?
(a) Metaphase I
(b) Telophase I
(c) Anaphase I
(d) Prophase I
25. What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?
1. Answer: (b) centre to the walls
Explanation: The cell plate grows from the center toward the cell walls. New cell walls are made from the vesicle contents.
2. Answer: (c) Prophase
Explanation: Prophase is the first stage of mitosis. In prophase, chromosomes condense and become visible.
3. Answer: (b) 16
Explanation: Onion root tip cells have 16 chromosomes in each cell.
4. Answer: (a) Anaphase
Explanation: The stage in which daughter chromosomes move toward the poles of the spindle is Anaphase.
5. Answer: (d) Metaphase
Explanation: Metaphase is the best time to count and study the number and morphology of chromosomes.
6. Answer: (c) Prophase
Explanation: During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down.
7. Answer: (b) endomitosis
Explanation: Endomitosis is the process of chromosome divides or doubles without nuclear division which leads to the formation of a polyploidy nucleus where one nucleus will have multiple sets of chromosomes. So, the correct answer is ‘Endomitosis’.
8. Answer: (a) prophase I in meiosis
Explanation: Recombination occurs when two molecules of DNA exchange pieces of their genetic material with each other. One of the most notable examples of recombination takes place during meiosis (specifically, during prophase I), when homologous chromosomes line up in pairs and swap segments of DNA.
9. Answer: (a) Is generally short-lived and followed by prophase II
Explanation: The stage between two meiotic divisions is called interkinesis and is generally short-lived. Here the cell undergoes a period of rest. No DNA replication and no gene duplication occur during this stage. It is important for bringing true haploidy in daughter cells.
10. Answer: (a) Meiotic prophase
Explanation: Chromosomes transform into the lampbrush form during the diplotene stage of meiotic prophase I due to the active transcription of many genes. They are highly extended meiotic half-bivalents, each consisting of 2 sister chromatids.
11. Answer: (d) cytoplasm
Explanation: Nucleoproteins are synthesized in the cytoplasm. Nucleoproteins are proteins that are linked structurally with nucleic acids, either RNA or DNA.
12. Answer: (b) anaphase-I
Explanation: Segregation of Mendelian factor (Aa) occurs during Anaphase-I. The paired homologous chromosomes separate in meiosis-I so that each gamete receives one chromosome of each homologous pair.
13. Answer: (b) nucleus in heredity
Explanation: Hammerling’s experiment of Acetabularia involved exchanging rhizoid and stalk. Presence of hereditary information in the nucleous was proved by the work of Hammerling on single-celled alga Acetabularia.
14. Answer: (d) chromocentre
Explanation: Chromocenter is the point at which polytene chromosomes appear to be attached together.
15. Answer: (d) Plectonemic in mitosis and paranemic in meiosis
Explanation: Plectonemic coiling occurs in mitosis and Paranemic coiling occurs in meiosis. DNA is coiled and shortened about sevenfold of its length which means that the DNA of 1 m long becomes 14 cm in its strings of beads.
16. Answer: (b) Metaphase
Explanation: The best time to study chromosome size and shape is metaphase/late prophase.
17. Answer: (d) translocation
Explanation: The exchange of segments of non-homologous chromosomes is called Translocation.
18. Answer: (c) crossing over
Explanation: An exchange of chromosome segments between non-sister homologous chromatids occurs and is called crossing over. The crossover events are the first source of genetic variation produced by meiosis.
19. Answer: (a) cell cycle activities
Explanation: Calcium Dependent Kinases (CDKs) have the ability to control cell cycle activities during cell division.
20. Answer: (d) Plastids
Explanation: The presence of plastid is a feature of plant cells but animal cells are devoid of them. Even then they function properly and divide mitotically similar to plant cells.
21. Answer: (c) Interkineses
Explanation: The connecting link between Meiosis-I and Meiosis-II is interkinesis.
22. Answer: (d) Flower bud
Explanation: Diakinesis is the stage of meiosis. For the study of meiosis young flower bud is the best material.
23. Answer: (b) root tip
Explanation: Root tips are the best to study mitosis. It is characteristic of meristematic cells present at the tip of the roots that provide the most suitable and sufficient raw material to study the different mitosis stages. Onion is a monocot plant and is the most commonly used root tip to study mitosis.
24. Answer: (d) prophase I
Explanation: In prophase I of meiosis, the homologous chromosomes form the tetrads.
25. Answer: (b) 63
Explanation: Since the cells of the aleurone layer are triploid, the number of chromosomes would be = 63, as root tip cells (2n) have 42 chromosomes.
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