FBISE Class 9th (SSC-l)
Explore subjects and practice MCQs
3
Chapters
1,610
Total MCQs
FBISE Class 9th (SSC-l)
1001
Answer: Benign tumors are non-cancerous and remain localized at their site of origin.
Answer: Malignant tumors are cancerous and can spread (metastasize) to other parts of the body.
Answer: Unlike benign tumors, malignant tumors invade surrounding tissues and spread through the body.
Answer: Cancer results when cells divide without the normal control of the cell cycle.
Answer: Apoptosis is an orderly, programmed process, whereas necrosis is unplanned cell death caused by injury.
Answer: Apoptosis is the genetically controlled process of cell suicide.
Answer: Apoptosis removes unneeded cells, for example the webbing between the fingers is removed by programmed cell death.
Answer: Metastasis is the movement and growth of cancer cells at new sites away from the primary tumor.
Answer: Apoptosis eliminates cells whose DNA is damaged beyond repair, preventing them from becoming cancerous.
Answer: Cancer cells have lost normal cell cycle control, so they divide continuously and form tumors.
1011
Answer: A tissue is a group of similar cells that work together to carry out a specific function.
Answer: Cells group to form tissues, tissues form organs, organs form organ systems, which together form an organism.
Answer: Meristematic tissue contains actively dividing cells that bring about growth in plants.
Answer: Meristematic cells have thin cell walls, dense cytoplasm and prominent nuclei because they divide actively.
Answer: Lateral meristem (vascular cambium and cork cambium) adds new layers, increasing the thickness of stems and roots.
Answer: Apical meristem is present at the growing tips of roots and shoots and increases their length.
Answer: Intercalary meristem is present at the bases of internodes, mainly in grasses and monocots, and helps in their regrowth.
Answer: Parenchyma is a simple tissue made of only one type of cell, while xylem, phloem and epidermis are complex or special tissues.
Answer: Collenchyma has thickenings of cellulose and pectin at the corners, providing flexible mechanical support to young stems.
Answer: Sclerenchyma cells have thick, lignified walls and are usually dead at maturity, giving mechanical support.