Chapter 12 Mineral Nutrition
Chapter 12 Mineral Nutrition Question 1. “All elements that are present in a plant need not be essential to its survival”. Comment. Solution: Plants obtain their inorganic nutrients from the air, water, and soil. Plants absorb a wide variety of mineral elements. Not all the mineral elements that they absorb are required by plants. Out […]
Chapter 11 Transport in Plants
Chapter 11 Transport in Plants Question 1. What are the factors affecting the rate of diffusion? Solution: Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature, and pressure. Question 2. What are porins? What role do they play in diffusion? Solution: Porins are proteins that form huge […]
Chapter 10 Cell Cycle and Cell Division
Chapter 10 Cell Cycle and Cell Division Question 1. What is the average cell cycle span for a mammalian cell? Solution: It is significant to note that in the 24-hour average duration of the cell cycle of a human cell or mammalian cells, cell division proper lasts for only about an hour. Question 2. Distinguish […]
Chapter 9 Biomolecules
Chapter 9 Biomolecules Question 1. What are macromolecules? Give examples. Solution: Biomolecules i.e. chemical compounds found in living organisms are of two types. One, those which have molecular weights less than one thousand and are usually referred to as macromolecules or simply as biomolecules while those which are found in the acid-insoluble fraction are called […]
Chapter 8 Cell: The Unit of Life
Chapter 8 Cell: The Unit of Life Question 1. Which of the following is not correct? (a) Robert brown discovered the cell. (b) Schleiden and Schwann formulated the cell theory. (c) Virchow explained that cells are from pre¬existing cells. (d) A unicellular organism carries out its life activities within single cell. Solution: (a) Robert brown discovered […]
Chapter 7 Structural Organization in Animals
Chapter 7 Structural Organization in Animals Question 1. Answer in one word or one line. (i) Give the common name of Periplaneta americana. (ii) How many spermathecae are found in earthworms? (iii) What is the position of ovaries in cockroach? (iv) How many segments are present in the abdomen of the cockroach? (v) Where do […]
Chapter 6 Anatomy of Flowering Plants
Chapter 6 Anatomy of Flowering Plants Question 1. State the location and function of different types ofmeristems. Solution: Question 2. Cork cambium forms tissues that form the cork. Do you agree with this statement? Explain. Solution: Sooner or later, another meristematic tissue called cork cambium or phellogen develops, usually in the cortex region. Cork cambium […]
Chapter 5 Morphology of Flowering Plants
Chapter 5 Morphology of Flowering Plants Question 1. What is meant by modification of root? What type of modification of root is found in the: (a) Banyan tree (b) Turnip (c) Mangrove trees. Solution: Root in some plants change their shape and structure and become modified to perform functions other than absorption and conduction of […]
Chapter 4 Animal Kingdom
Chapter 4 Animal Kingdom Question 1. What are the difficulties that you would face in the classification of animals if common fundamental features are not taken into account? Solution: There are millions of living organisms with a vast variety of shapes, sizes,s, and forms. They occur in a variety of habitats. It is difficult to […]
Chapter 3 Plant Kingdom
Chapter 3 Plant Kingdom Question 1. What is the basis of the classification of algae? Solution: Classification of Algae: The algae are divided into three main classes: Chlorophyceae, Phaeophyceae, and Rhodophyceae. Chlorophyceae: The members of Chlorophyceae are commonly called green algae. Phaeophyceae: The members of Phaeophyceae or brown algae, are found primarily in marine habitats. […]