How do Organisms Reproduce – Previous Years Questions The thread like structure that develop on a moist slice of bread in Rhizopus are : a. Sporangia b. Filaments c. Rhizoids d. Hyphe [CBSE 2023] [1 Mark] Choose the correct order of the stages of binary fission in Leishmania. a. I, II, III, IV, Vb. I, […]
How do Organisms Reproduce – Important Questions Name the hormones responsible for the changes in boys and girls at the time of puberty. . Describe the various steps involved in the process of binary fission with the help of a diagram. Why do multicellular organisms use complex way of reproduction? . Describe the role of […]
How do Organisms Reproduce? – Notes Reproduction:- The process by which the organisms produce young ones of their own kind is called reproduction. Types of reproduction:- Asexual reproduction Sexual reproduction Asexual reproduction:- The type of reproduction in which a single parent is involved is called asexual reproduction. Types of asexual reproduction:- Fission:- The type of […]
Periodic Classification Of Elements – Previous Years Questions Write the atomic numbers of two elements ‘X’ and ‘Y’ having electronic configurations 2, 8, 2 and 2, 8, 6 respectively. [CBSE 2014] [1 Marks] State the common characteristics of the following elements:Boron, Silicon, Germanium and Arsenic [CBSE 2020] [1 Marks] An element X with atomic number […]
Quadratic Equations – Previous Years Questions The quadratic equation x2 – 4x + k = 0 has distinct real roots if k = 4 k > 4 k = 16 k < 4 [CBSE 2020] [1 Mark] Write the discriminant of the quadratic equation (x + 5)2 = 2(5x – 3). [CBSE 2019] [1 Mark] […]
Pair of Linear Equations in Two Variables – Previous Years Questions The pair of linear equations y = 0 and y = -6 has a unique solution no solution infinitely many solution only solution (0,0) [CBSE 2020] [1 Mark] Solve the following pair of linear equations:3x – 5y = 42y + 7 = 9x [CBSE […]
Control and Coordination Notes Stimulus:- The change in the environment to which an organism respond and react is called stimulus. Receptors:- The group of cells present in sense organs which are sensitive to change in environment are called receptors. There are five types of receptors:- Gustatory receptor Olfactory receptor Photo receptor Phono receptor Thermo receptor […]
Periodic Classification of Elements Important Questions “Atomic number of an element is considered to be a more appropriate parameter than its atomic mass for a chemist.” Take the example of element X (atomic number 13) to justify this statement. How many triads did Dobereiner identify from the existing elements during his time ? Give an […]
Periodic Classification of Elements Notes Döbereiner’s triads:- Dobereiner arranged elements with similar properties into groups having three elements each and called those groups triads.When the three elements in a triad were written in the order of increasing atomic masses, the atomic mass of middle element was roughly equal to the average atomic masses of other […]
Carbon and its Compounds Previous Years Questions Assertion (A) : Melting point and boiling point of ethanol are lower than that of sodium chloride. Reason (R) : The force of attraction between the molecules of ionic compounds are very strong. Answer the question selecting appropriate options given below : a. Both Assertion (A) and Reason […]