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ICSE Class X Mid-term 2026 : Biology : AMNS

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LEAD A. M. NAIK SCHOOL, POWAI ICSE and ISC AM.NAIK BCHOOL FIRST TERM EXAMINATION (2025 - 26) SUBJECT: BIOLOGY Name: ANAY SINGH Date: 16th September 2025 Grade: 10 Div.:C Roll No.: 26 Reading Time: 8:15 a.m.- 8:30 a.m. Maximum Marks: 80 Writing Time: 8:30 a.m. - 10:30 a.m. Answers to this Paper must be writen on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent reading the question paper. The time given at the head of this Paper is the time allowed for wriing the answers. Section Ais compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [). This paper consists of 8 Questions printed on 7 sides. ALL THE BEST! A M Naik School, Sak1 Vihar Road, Between L&T Gate No 1&2, Powai. Mumbai 400 072 Tol.: -I30|)99077 | Email: amnailkschool . gmad.com | Websitc: www.amnuilkachsol n SECTION -A [40 MARKS] (Attempt all questions from this section) Question 1. Select the correct answers to the aquestions from the given options. (Do not copy the questions, write the correct answer only) (15] 0) The sex chromosome in a human ovum is (a) Xchromosome (b)Ychromosome (c) Both X and Y chromosomes (d)Either Xor Ychromosome ()Deplasmolysis occurs when a plasmolysed cell is placed in (a) Concentrated salt solution (b) Tap water (c) Crated agar solution (d) Hypertonic salt solution (m) Assertion: Palisade cells of mesophyil are loosely aranged towards the lower epidermis of a dorsiventral leaf. Reason: Palisade cells contain the maimum amount of chlorophyll, trap solar energy and help in the process of photosynthesis. (a) Both Aand Rare true and Ris the corect explanation of A. (b)Both Aand Rare true but Ris not the correct explanation of A. (c) A is true but R is false. (d) A is false but Ris true. (iv) The site of light reaction in the cells of a green leaf is (a) Nucleus (b) Grana of chloroplast (c) Cytoplasm (d) Stroma of chloroplast (v) The paper used to demonstrate unequal transpiration in a dicot leaf is (a) Filter paper (c) Starch paper (b) LitmuS paper (d) Cobalt chloride paper (vi) Duringthe synthesis phase of the cell cycle, more of (a) RNA is synthesized (c) DNA is synthesized (b)RNA and proteins are synthesized (d) Glucose is synthesized (vii)The nuclear membrane and nucleolus reappear during (a) Prophase (c) Metaphase (b) Anaphase (d) Telophase 1 ) HoW many cells will be produced if a cell divides mitotically four times? (a) 24 (b) 32 (c) 16 (d) 64 (X) The process of conversion of ADP to ATP during photosynthesis is called (a) Polymerisation (b) Photophosphorylation (c) Photorespiration (d) Photolysis (X) The pressure developed in the roots due to continuous inward movement of water by cell to cell osmosis is called (a) Root Pressure (b) Wall Pressure (c) Turgor Pressure (d) Air Pressure xi) NADP is expanded as (a) Nicotinamide Adenosine Dinucleotide Phosphate (b) Nicotinamide Adenine Dinucleotide Phosphate (c) Nicotinamide Adenine Dinucleolus Phosphate (d) Nicotinamide Adenosine Dinucleolus Phosphate xii) A homozygouS pea plat having purple flowers is crossed with a homozygous pea plant bearing white flowers. The phenotypic ratio of the offspring obtained in F2 generation is (a) 2:1 (b) 1:1 (c) 1:2:1 (d) 3:1 Xii) Law of Dominance is stated as (a) Out of a pair of contrasting alleles present together, only the recessive allele is able to express itself while the dominant remains suppressed (b) Out of apair of contrasting alleles present together, only the dominant allele is able to express itself while the recessive remains suppressed (c) Out of a pair of contrasting alleles present together, both dominant and recessive cannot express themselves (d) Out of apair of contrasting alleles present together, both dominant and recessive can express themselves xiv) Assertion (A): Auxin is a growth-promoting plant hormone. Reason (R): Auxins are mainly synthesized in shoot apical meristems and young leaves. (a) Both Aand Rare true and Ris the correct explanation of A. (b) Both Aand Rare true but Ris not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. 2 xv) Mary sprinkled 5 kg of common salt on the grass arowing on her lawn. Aftera couple of days, she observed that the grass had wilted and died. This was due to which or tne following conditions? (a) Endosmosis (b) Turgidity (c) Deplasmolysis (d) Plasmolysis Question 2 (i) Name the following (a) The process during meiosis which is responsible for genetic recombination. (b)The result of uncontrolled cell division. (C) The pressure which is responsible for the movement of water molecules across the cortical cells of the root. (d) Agrowth-retarding hormone in plants. (e)The tuft of capillaries inside the Bowman's capsule. () Rewrite the correct form of the statement by changing the first or the last wordonly (5] (a) The inheritable feature of an organism is termed as heredity. (b)Terminal flower position is a dominant trait of pea fiower. (c) Alternative forms of a gene are called traits. (d) Photosynthesis results in loss of dry weight of the plants. (e) The glomerular filtrate is collected in Bowman's capsule afterthe process of reabsorption. (ii) Match the following and write the correct matches in the format (g)-(vii) ColumnA Column B (a) Auxin (0) apical dominance (b) Gibberellin (ii) cell-division (c) Cytokinin (ii) fruit ripening (d) Ethylene (iv) internodal elongation (e) Abscisic acid (v) Induces dormancy 3 (5] (iv) State the functions of the following [5] (a) Guardcells (b) Spindle fibers (c) Hydathodes (d) Thylakoids (e) Histone octamer (V) Find the odd one out and state the category of the other terms. [5] (a) Haemophilia, colour blindness, night blindness, albinism. (b) Hydathodes, stomata, cuticle, lenticles. (c) Glucose, water, oxygen, carbon dioxide. (d) Light intensity, temperature, Humidity, wind velocity. (e) Renal pelvis, renal cortex, renal medulla, ureter. SECTIONB[40 MARKS] (Attempt any four questions). Question 3 () An outline sketch of a tree is shown in the diagram below. Study the same and answer the (3] questions that follow: (a)Explain the phernomenon occurring in A. (b)What is the importance of this phenomenon in plants? (c) What do the direction of arrows in Band C indicate? (ii) Explain the role of the following external factors on the rate of the phenomenon mentioned in question () a. [2] (a) Wind velocity (b) Atmospheric pressure (c) Humidity (d) Temperature (i) Draw a neat and labelled diagram of a plant cell showing the direction of turgor pressure and wall pressure (3] (iv) What is photolysis? Explain with the help of a chemical reaction. 4 (2] Question 4 (9Teelwas given two specimens of cells to ghsenve underamicroscope during her biology project. Look carefully at the specimens and helo Preetisolve the questions given below: (3] (a) What is the technical term for the condition of Cell 1and cell 2. (b) From the solution given in the brackets, name the solution into which cell 1and cell 2 were placed before being viewed under a microscope. (water, strong sugar solution, 1% salt solution) (C) Name the process responsible for the movement of water from the root hair cell to the xylem of the roots. (0) Draw a neat and labelled diagram of a root cell with its root hair when placed in a strong hypertonic solution. 31 (ii) Differentiate between endosmosis and exosmosis. Any two pontsj (2] (iv) Explain the process of Dialysis. (2] Question 5 () Ravi's teacher asked him to design an experiment to prove that a certain factor was (3] essential for photosynthesis. He was given a potted plant with variegated leaves. He kept it in the dark for 24 hours and then placed it in bright sunlight for a few hours. (a) What aspect of photosynthesis was Ravi testing? (b) Why was the plant kept in the dark before beginning the experiment? (c) What willbe the result of the starch test performed on leaf 'A' shown in the diagram? ( ) Draw aneat, labelled diagram of a chloroplast. (3] (ii) Represent the process of photosynthesis in the form of a balanced equation. (2] (iv) State two diferences between Afferent arteriole and efferent arteriole (21 5 Question 6 )1ne dlagramrepresents four stages of cell division which are not in sequence. Study the [3] diagram and then answer the questions carefully. (a) Re-draw the diagram in your answer sheet in the correct sequential order and name the stages. (b) Label any two parts which are visible in the A B C diagrams. (C) Is it plant cell or animal call? Give a logical reason for your answer. (0) Mention one point of difference between "mitosis" and "meiosis" with regard to: (a)The number of daughter cells formed. (b) The chromosome number in the daughter cells. (c) Type of cells in which the process OCCurs. (3] (1) Explain why generally only the male child suffers from colour blindness and not the female? [2] (iv) Explain the term mutation with the help of an example. [21 Question 7 ()The diagram given below is that of a structure present in a human kidney. Observe the diagram and answer the questions that follow: (3] (a) What is the fluid entering part '1' called? Name two substances present in this liquid that are reabsorbed in the tubule. (b) What is the fluid that comes to part '2 called? Name the main nitrogenous waste in it. (c) Menti n the three main steps involved in the formation of the fluid mentioned in question () b. (i) Kartik and his friends were playing cricket when accidently the ball hit a potted plant in the garden. None of them noticed that the pot had been kndcked off and continued with their game. The pot remained in that position for many days and the following changes were (3] observed. 6 (a) What happened to the shoot and root of the plant? (b) Name the scientific phenomenon that resulted in the change seen in part A and part B A (c) Explain the term tropism. (i ) Abscisic acid is also called stress hormone. Explain. 121 (iv) Drawaneat and labelled diagram of two nucleotides showing complementing nirOgenous bases. (2] Question 8 () Make a Punnettsquare and find out the genotypic and phenotypic ratios of F1and F2 generations in the progeny of a genetic cross between a pure tal pea plant with a pure dwarf pea plant. [3] (W) Findout the progeny of a marriage between a colour blind man and a carrier woman. (2] (ii) Give reasons for the following statements: [21 (a) We urinate fewer times in summer than in winter and the urine passed is generally thicker. (b)Patients suffering from cholera may die due to uremia. (iv) Draw a neat and labelled diagram of the Malpighian capsule. 7 (3]

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