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.

The false statement is: (d) Cytoplasm is also called protoplasm. Mitochondria and plastids have their own DNA and can replicate independently. Lysosomes are formed from the Golgi apparatus. ATP (energy currency of the cell) is produced in mitochondria. Class ...

The false statement is: (d) Cytoplasm is also called protoplasm. Mitochondria and plastids have their own DNA and can replicate independently.Lysosomes are formed from the Golgi apparatus. ATP (energy currency of the cell) is produced in mitochondria. Class 9th ...

The correct answer is (c) A virus. Viruses can be crystallized because they are non-living outside a host and have a well-organized structure made of proteins and genetic material. Unlike amoebas, sperms, and bacteria, which are living cells and cannot ...

The correct answer is (d) (i) and (ii). Ribosomes are responsible for protein synthesis and help in the manufacture of enzymes (which are proteins). However, they do not manufacture starch grains (carbohydrates) or hormones (some of which are proteins but ...

The correct answer is (d)(i), (ii) and (iv). Dalton’s atomic theory successfully explained: Law of Conservation of Mass(i) – Atoms are neither created nor destroyed in a chemical reaction. Law of Constant Composition(ii) – A compound always contains the same ...

The correct answer is (b) 2,8,2. Magnesium (Mg) has an atomic number of 12, meaning it has 12 electrons. The electronic distribution follows the 2,8,2 pattern according to the Bohr model, where the first shell holds 2 electrons, the second ...