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 ...
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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 correct answer is (d) glycolipids and glycoproteins. Carbohydrates in the plasma membrane are attached to lipids (glycolipids) or proteins (glycoproteins). They play a crucial role in cell recognition, signaling, and adhesion but are not present as cellulose, starch, or ...
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 ...