Practice free Cell cycle and Cell Divisions (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Cellular structures which disappear during late prophase and reappear during telophase are:
Nuclear membrane, nucleolus disappear during late prophase and then reappear during telophase.
(page-165)
Cytokinesis in animal cell takes place by _______; in _______ direction while in plant cell by _______; in _______ direction:
In an animal cell, cytokinesis is achieved by the appearance of a furrow in the plasma membrane in centripetal direction while in plant cell, it is achieved by the cell plate formation in the centre of the cell and grows outward to meet the existing lateral walls (centrifugal).
(page-166)
One difference between mitosis and meiosis I is that:
In prophase I of meiosis I, synapse formation i.e. crossing over takes place whereas no such event occurs in prophase of mitosis.
Which of the following is false?
G1 phase corresponds to the interval between mitosis and initiation of DNA replication. During G1 phase the cell is metabolically active and continuously grows but does not replicate its DNA.
A reduction step during meiosis is important because:
Meiosis ensures the production of haploid phase in the life cycle of sexually reproducing organisms whereas fertilisation restores the diploid phase. We come across meiosis during gametogenesis in plants and animals. This leads to the formation of haploid gametes.
(page-167)
Let a cell's generation time is 1 minute. In 20 minutes a culture tube (culture medium) is 1/8th filled with cells. When the tube will be fullfilled?
Generation time = 1 minute
Cells divide in 1 minute = 2^1 = 2
2 minutes = 2^2 = 4
20 minutes = 2^20 = 1/8 of tube filled with cells
Total volume tube can hold = 2^20 X 8
= 2^20 X 2^3
= 2^23
= 23 minutes
Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres:
In anaphase I, the homologous chromosomes separate, while sister chromatids remain associated at their centromeres.
(page-169)
What is the cause of variation?
Variation arises due to meiosis, where genetic recombination and random segregation of chromosomes occur. Meiosis produces haploid gametes with unique genetic combinations, leading to variation in the offspring. Asexual reproduction, amitosis, and mitosis do not contribute to genetic variation.
The number of chromosomes in a meiocyte of the fruit fly is:
Read page 13, Table 1.1, XII, NCERT
Which of the following processes is a significant contribution of mitosis in multicellular organisms?
According to the NCERT text, 'A very significant contribution of mitosis is cell repair. The cells of the upper layer of the epidermis, cells of the lining of the gut, and blood cells are being constantly replaced.' Options 1, 2, and 4 are associated with meiosis.
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