The correct answer is:(d) contraction of skeletal muscles which pulls the tendon to move the bones. When you run or walk, skeletal muscles contract and their tendons pull on the bones, causing movement. Tendons connect muscles to bones, facilitating voluntary ...

The correct answer is:(d) (iii) and (iv) Cardiac muscles and smooth muscles act involuntarily. Cardiac muscles are found in the heart and contract automatically, while smooth muscles are found in internal organs like the stomach and intestines, controlling movement without ...

The correct answer is:(c) Mitosis Mitosis is the type of cell division responsible for growth, development and repair in multicellular organisms. It produces genetically identical diploid cells, ensuring the body’s tissues grow and regenerate without altering genetic information. Class 9th ...

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.

The correct answer is (c) endocytosis. Amoeba captures food using phagocytosis, a type of endocytosis, where it extends its pseudopodia around the food particle, engulfing it into a food vacuole for digestion. Exocytosis is the process of expelling waste, not ...

The correct answer is:(b) vacuole. The tonoplast is a differentially permeable membrane that surrounds the vacuole in plant cells. It regulates the movement of ions, nutrients, and waste materials between the vacuole and the cytoplasm, helping maintain cellular homeostasis.