The correct answer is:(a) Virchow Rudolf Virchow (1855) proposed the famous statement “Omnis cellula e cellula,” meaning “cells arise from pre-existing cells.” This idea contributed to the Cell Theory, emphasizing that cell division is the basis of life. Class 9th ...

The correct answer is:(d) Both (b) and (c). The contractile vacuole in unicellular organisms like Amoeba and Paramecium helps in osmoregulation by expelling excess water and also aids in excretion by removing metabolic wastes, maintaining the cell’s internal environment. Class ...

The correct answer is (a) 10⁻⁶ m. 1 micrometer (µm) = 10⁻⁶ meters, which means it is one-millionth of a meter. It is commonly used to measure cell sizes, bacteria and microscopic structures in biology and microbiology. Class 9th Science ...

The correct answer is:(d) Golgi apparatus The Golgi apparatus forms lysosomes by packaging digestive enzymes into membrane-bound vesicles. These lysosomes help in breaking down waste materials, cellular debris, and foreign substances through enzymatic action. Class 9th Science NCERT MCQ Questions

The correct answer is:(c) nucleoid. In prokaryotes, the nuclear region is called the nucleoid, which is an irregularly shaped area containing the cell’s genetic material (DNA). Unlike eukaryotic nuclei, it is not membrane-bound and floats freely in the cytoplasm.