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ICSE Class X Sample / Model Paper 2025 : Biology : Assignment

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ASSIGNMENT 2 CLASS X ICSE 2025 1. 2. Define the following terms: a. Homologous chromosome b. Phenotype c. Law of Segregation d. Hormone e. Geotropism Give reasons for the following a. Our mouth dries up before delivering a maiden speech. b. X-linked recessive diseases are more common among males than females. c. Insulin is injected into the body of a highly diabetic patient and not given orally. d. ABA is known as stress hormone. 3. Complete the table given below by filling in the blanks numbered 1 to 8. Gland Hormone Secreted Effect on Body 1 2 Regulates basal metabolism Pancreas ((3-cells) 3 4 5 6 Increases heart beat 7 Thyroid stimulating hormone 8 4. (i) State Mendel s Law of Dominance. (ii) A tall plant bearing purple flowers is crossed with a dwarf plant bearing white flowers.Draw Punnett squares to show (1) F1 generation (2) F2 generation. (iii) Give the Phenotype of the F2 generation. (iv) Give the phenotypic ratio of the F2 generation. (v) Name any one X-linked disease found in humans. Choose the correct option for questions 5 and 6. 5. Which part of the DNA provides information for a protein? (a)Chromosome (b)Mitochondria (c)RNA (d)Gene 6. A lab teacher wants to demonstrate thigmonastic behaviour of a plant. Which of these experiments is the best choice? a. b. c. d. Observe flowering of a plant after a brief red light irradiation in the middle of a dark period. Observe whether seedlings bend towards blue light. Observe whether a tree grows bent in the direction of the prevailing wind. Touch the plant Mimosa pudica and observe the closing of the leaflets. Study the following assertion reason statements and select the correct option 7. Assertion (A): Gibberellins are involved in seed germination. Reason (R): Gibberellins break seed dormancy and promote the synthesis of amylase. (a) Both A and R are True (b) Both A and R are False (c) A is True and R is False (d) A is False and R is True 8. Assertion (A): Old age is not an illness. It is a continuation of life with decreased capacity for adaptation. Reason (R): Cessation of mitosis is normal genetically programmed event. (a) Both A and R are True and R is the correct explanation of A (b) Both A and R are True but R is not the correct explanation of A (c) A is True and R is False (d) A and R are false 9. Assertion (A): The G2 phase of the cell cycle is a checkpoint for DNA damage and completeness of replication. Reason (R): Cells that pass the G2 checkpoint proceed to mitosis. (a) Both A and R are True (b) Both A and R are False (c) A is True and R is False (d) A is False and R is True 10. Given below is a diagram representing a stage during mitotic cell division. Study it carefully and answer the questions that follow: (i) Is it a plant cell or an animal cell? Give a reason to support your answer. (ii) Identify the stage shown. (iii) Name the stage that follows the one shown here. How is that stage identified? (iv) How will you differentiate between mitosis and meiosis on the basis of the chromosome number in the daughter cells?

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