Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Select the wrong statement:
Correction: DNA synthesis occurs only during one specific stage in the cell cycle whereas increase in cytoplasmic content is a continuous process.
Which one is correct for Go stage?
I. It is a quiescent stage
II. In this phase cell cycle is stopped
III. G0 cells in this stage do not grow or proliferate but metabolically active
IV. G0 cells can divide in response to some stimulus
All of the above statements with respect to G0 phase are correct.
(page-164)
Which of the following statements is false?
Meiosis occurs in plants in anthers and ovary to form haploid gametes.
At metaphase of mitosis, each chromosome consists of _______ chromatid(s) _______ centromere(s) ________ kinetochore(s) and _______ molecules of DNA:
Metaphase chromosomes are made up of 2 sister chromatids, held together by 1 centromere. Small disc-shaped structures at the surface of the centromeres are called kinetochores which are 2 in number. These structures serve as the sites of attachment of spindle fibres to the chromosomes.
(page-165)
Centrosomes are:
Centrosomes are made of two centrioles. It is an organelle that serves as the main microtubule organizing center (MTOC) of the animal cell.
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)
Liquid endosperm in coconut is resulted due to:
In some organisms karyokinesis is not followed by cytokinesis as a result of which multinucleate condition arises leading to the formation of syncytium (e.g., liquid endosperm in coconut).
(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.
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