Cell Division
ICSE · Class 10 · Biology
Flashcards for Cell Division — ICSE Class 10 Biology. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allWhat is cell division and why is it necessary for living organisms?
Answer
Cell division is the process by which a single cell divides to form two or more daughter cells. It is necessary because: 1) As cells grow, the ratio between nucleus and cytoplasm gets disturbed, 2) Su…
Define cell cycle and state its duration in eukaryotes.
Answer
Cell cycle is the period from the end of one division of a cell to the end of the next division. In eukaryotes, the entire cell cycle lasts 10-30 hours, while the actual division takes only 30 minutes…
What are the two main phases of cell cycle? Describe briefly.
Answer
The two main phases are: 1) Interphase - The growth period between two successive divisions, includes G1, S, and G2 phases, 2) Division phase (M-phase) - The actual division period including karyokine…
Compare G1 phase and G2 phase of interphase.
Answer
G1 Phase: Comes before S-phase, synthesis of RNA and proteins occurs, chromosomes are uncoiled and thin, constitutes 30-40% of cell cycle. G2 Phase: Comes after S-phase, synthesis of proteins and dupl…
What happens during S-phase of interphase?
Answer
During S-phase: 1) DNA is replicated (duplicated), 2) Histone proteins are synthesized, 3) Each chromosome becomes made of two chromatids, 4) This phase constitutes 30-50% of the entire cell cycle.
Name the three types of karyokinesis and define each briefly.
Answer
1) Amitosis - Simple division without spindle formation, nuclear membrane doesn't dissolve, genetic material may not be equally divided, 2) Mitosis - Somatic cell division/equational division with equ…
Who discovered mitosis and where does it commonly occur?
Answer
Mitosis was discovered by W. Flemming. It commonly occurs in somatic or body cells like meristem, cambium, epithelium (stratum malpighi of skin), and cells of bone marrow.
List any five functions/significance of mitosis.
Answer
1) Reproduction in unicellular organisms like Amoeba, 2) Development of multicellular body from zygote, 3) Growth from embryo to adult, 4) Repair of wounds and damaged tissues, 5) Regeneration of lost…
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