FBISE Class 9th (SSC-l)
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Total MCQs
FBISE Class 9th (SSC-l)
Answer: In animal cells, a cleavage furrow forms at the equator and deepens until the cell divides into two.
Answer: Plant cells divide by forming a cell plate at the equator, which grows outward and becomes the new cell wall.
Answer: Vesicles from the Golgi apparatus fuse at the equator to form the cell plate in plant cells.
Answer: A ring of actin microfilaments contracts beneath the cell membrane, pinching the cell into two.
Answer: The rigid cell wall of plant cells prevents pinching, so they divide by forming a cell plate from the centre outward.
Answer: Karyokinesis (nuclear division) occurs first, followed by cytokinesis (cytoplasmic division).
Answer: Centrioles are found in animal cells, where they help organize spindle fibers during division.
Answer: Plant cells lack centrioles; their spindle fibers are formed without them.
Answer: Plant cells lack centrioles, which are present in animal cells and take part in spindle formation.
Answer: Without centrioles, plant cells use other microtubule organizing centers to form the spindle during division.
Answer: Growth occurs by the mitotic division of somatic cells, which increases the number of cells in the body.
Answer: Damaged tissues are repaired as surrounding cells divide by mitosis and replace the lost cells.
Answer: In Hydra, new individuals are produced by budding, which involves mitotic divisions of cells.
Answer: Mitosis produces two genetically identical daughter cells, also called clones.
Answer: Mature nerve cells (neurons) enter the G0 phase and generally do not divide.
Answer: Mitosis occurs in somatic cells, while meiosis occurs in reproductive cells.
Answer: Skin cells near the wound divide rapidly by mitosis, producing new cells that replace the damaged ones.
Answer: When cell division is not properly controlled, cells divide excessively, forming tumors and leading to cancer.
Answer: Since mitosis produces two diploid daughter cells, the chromosome number remains constant generation after generation.
Answer: Checkpoints (such as G1/S and G2/M) monitor the cell cycle and ensure the cell divides only under proper conditions.