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ICSE Class 8 Mid-term 2025 : Biology

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Rekha More
Wisdom World School, Hadapsar, Pune

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WISDOM WORLD SCHOOL Kumar Picasso, Hadapsar Half Yearly Assessment 2025-26 Date:15.10.2025 Max. Marks: 80 Reading Time: 10 min Writing Time: 2hrs Std: VII SUBJECT: Biology (Answer Key) General Instructions: Answers to this Paper must be written on the answer sheet provided by the school. You will not be allowed to write in the first 10 minutes. This time is to be spent in reading the Question Paper. SECTION A (Attempt all questions from this Section.) Question 1- Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answer only) (i) In which form is sugar transported in solution through the veins of a leaf? a. Starch b. Glucose c. Sucrose d. Fructose (ii) Assertion (A): A plant growing near a busy road shows slower photosynthesis. Reason (R): The plant grows faster because pollution provides extra nutrients for photosynthesis. 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, but R is false. d. A is false, but R is true. (iii) Head and thorax are fused in ______________ and ____________________. a. crustacea and myriapoda b. crustacea and insecta c. crustacea and arachnida d. myriapoda and insecta (iv) The figures given alongside are supporting tissues in plants. Identify A and B. a. A- parenchyma B- collenchyma b. A- collenchyma B- sclerenchyma c. A- collenchyma B- parenchyma d. A- sclerenchyma B- collenchyma (v) [15] A B A patient s heart beats irregularly, causing poor blood circulation. Which type of muscle tissue is primarily responsible for the heart s rhythmic contractions? a. Striated muscle b. Smooth muscle c. Cardiac muscle d. Skeletal muscle Page 1 of 6 (vi) Ribbon-like thin and flattened body is found in ______________. a. platyhelminthes b. nematoda c. annelida d. porifera (vii) In the starch test experiment, _____________ is used to decolourise the leaf. a. water b. enzymes c. chlorophyll d. methylated alcohol (viii) In the practical exam, students were shown a mammal with external ears and hair on its body. Identify the organism and class. a. Fish, Pisces b. Pigeon, Aves c. Crocodile, Reptilia d. Rabbit, Mammalia (ix) If oxygen is supplied to yeast during bread-making, which process will occur instead of fermentation? a. Aerobic respiration, producing carbon dioxide and water b. Anaerobic respiration, producing lactic acid c. Photosynthesis, producing glucose d. Diffusion of gases (x) Scorpions and spiders are __________________. a. crustaceans b. myriapods c. arachnids d. insects (xi) The walls of the stomach and the blood vessels are made up of _________________ muscle cells. a. cardiac b. striated c. voluntary d. non-striated (xii) The organ of locomotion in molluscs. a. Legs b. Tentacles c. Tube feet d. Muscular foot (xiii) Organisms with jaws provided with a horny beak but no teeth belong to which class? a. Mammalia b. Reptilia c. Aves d. Pisces (xiv) Assertion (A): Epidermis in plants protects the internal tissues from injury and infection. Reason (R): Epidermis forms a continuous layer of tightly packed cells, similar to the epithelium in animals. 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, but R is false. d. A is false, but R is true. Page 2 of 6 (xv) How can you confirm the presence of oxygen in a test tube? a. By inserting a burning matchstick inside, which immediately goes out in the gas. b. By inserting a glowing matchstick inside, which burns brightly in the gas. c. By carefully smelling the gas inside, which gives an identifiable odour. d. By adding clear limewater to the gas, which turns milky oxygen is present. Question 2 (i) Match the animals given under column A with column B. [5] Column A Column B 1. Veins in leaves a. Lacks WBCs 2. Snail b. Echinodermata 3. Ligament c. Transport 4. Lymph d. Connects a bone to another bone at joints 5. Tendon e. Mollusca f. Connects a muscle to bones at joints g. Lacks RBCs Ans 1-c, 2-e, 3-d, 4-g, 5-f (ii) Answer the following in one word / phrase. [5] (a) The transport system of plants. Vascular system/ Xylem and Phloem (b) I am a hungry plant locked in a dark room for two days. I lost all starch from my leaves, and now I am waiting for sunlight to make food again. Who am I? A de-starched plant (c) Phylum in which animals with radial symmetry are found. Coelenterates / Echinodermata (d) Tissue located in the brain and spinal cord. Nervous tissue (e) Tissue that is composed of dead cells, that provides strength to the plant parts. Sclerenchyma (iii) Correct the following statements by changing the underlined word only. (a) Arachnida have three pairs of jointed legs. Insecta have three pairs of jointed legs. (b) Leaves have broad, wide and flat surfaces to absorb maximum water. Leaves have broad, wide and flat surfaces to absorb maximum light. (c) Amphibians breathe through lungs and gills. Amphibians breathe through lungs and skin. (d) Body of arthropoda is covered by a tough covering of cellulose. Body of arthropoda is covered by a tough covering of chitin. (e) Areolar tissue cushions and insulates the body. Adipose tissue cushions and insulates the body. (iv) Choose the odd one out and write the category of the remaining term. [5] (a) Turtle, Tortoises, Crocodiles, Frog Frog, rest belong to class Reptilia. (b) Cuboidal tissue, Connective tissue, Columnar tissue, Ciliated tissue Connective tissue, rest are the type of epithelial tissue. (c) Lymph, White fibrous tissue, Yellow fibrous tissue, Adipose tissue Lymph, rest all are fibrous connective tissue. (d) Meristematic tissue, phloem, parenchyma, collenchyma Meristematic tissue, rest are non-dividing permanent tissues. (e) Alcohol, Lactic Acid, Carbon dioxide, Chlorophyll Chlorophyll; Others: By-products of anaerobic respiration/respiration Page 3 of 6 [5] (v) Note the relationship between the first two words and suggest a suitable word/words for the fourth place. [5] (a) Photosynthesis: daytime:: Respiration: Day and Night/ Always (b) Columnar epithelium: Secretion ::Cuboidal epithelium: Absorption (c) Roots : Water absorption :: Stomata: Carbon dioxide intake / diffusion (d) Bird : Feathers :: Fish : Scales (e) Photosynthesis: Chloroplast :: Respiration: Mitochondria SECTION B (Attempt all questions from this Section.) Question 3: Answer the following: [1+2+2+2+3] (i) If the roots of a plant are not growing in length, which tissue is not active? Meristematic tissues (ii) In a school picnic, students saw a cow feeding its calf with milk. One curious child asked, Why don t birds or reptiles do the same? Mention the class to which cow belongs and explain the special characteristic of this class shown here. Mammals have mammary glands present in females that produce milk to nourish their young ones. (iii) In the experiment shown, a portion of the leaf is covered with black paper. After testing with iodine solution, only the uncovered part of the leaf turns blue-black while the covered part remains brown. Explain why this difference occurs. (iv) (v) The uncovered part of the leaf received sunlight and carried out photosynthesis, producing starch. When treated with iodine, starch turned blue-black. The covered part did not get sunlight, so no photosynthesis took place and no starch was formed, hence remains brown. Differentiate between cartilage and bone on the basis of their function. Cartilage Bone Cartilage covers the ends of bones, and Bone is the main supportive structure of supports organs such as tip of the nose, vertebrates. external ear. Draw a neat and labelled diagram of the basic structural and functional unit of Nervous tissue . Label any two parts. [3] Page 4 of 6 Question 4 Answer the following. (i) Which phylum refers to the spiny-skinned animals? Echinodermata (ii) Mention the breathing and locomotory structures in the organism shown in the figure given alongside. Breathing: Gills Locomotory: Fins (iii) (iv) (v) [1+2+2+2+3] How does extremely low temperature affect the rate of photosynthesis in a plant? Explain the reason. The rate of photosynthesis would slow down in extremely low temperature because the enzymes required for the process become less active at low temperatures. As a result, the plant produces less glucose, which affects its growth. Why is blood called a connective tissue? Blood is considered as a connective tissue as it connects all systems of the body and transports oxygen, nutrients, and wastes. Samay used a plant with variegated leaves for an experiment on photosynthesis. He tested a leaf with iodine after keeping the plant in sunlight for a few hours. a. Which parts of the leaf will turn blue black after the iodine test? Green parts b. Write the word equation of photosynthesis. Sunlight Carbon dioxide + Water Glucose + Oxygen Chlorophyll c. What is the significance of photosynthesis? Write any one point. - Photosynthesis provides food (glucose) for plants and all living organisms. - It releases oxygen into the atmosphere, which is essential for respiration. Question 5: Answer the following. [1+2+2+2+3] (i) What is the function of pores in poriferans? Pores draw water into the body cavity. (ii) Classify the following as a cell, tissue or organ. a. Skin- organ b. Skeletal muscles- tissue (iii) Rubeena observed that the money plant in her house needs sunlight to prepare food, while her pet rabbit eats grass. How are their modes of nutrition different with respect to food production? The money plant shows autotrophic nutrition as it makes its own food using sunlight through photosynthesis. The rabbit shows heterotrophic nutrition as it cannot make food and depends on plants for nutrition. Page 5 of 6 (iv) The experimental set-up shown alongside represents a process in plants. Study the same and answer the following questions. a. What is the aim of the experiment? Aim: To show that oxygen is given out during photosynthesis. b. Why is water used in this experiment? Water is used because, hydrilla being an aquatic plant releases oxygen as visible bubbles in water, which makes it easy to observe during the experiment. (v) Observe the given image and answer the questions that follow: a. Identify the given organism. Earthworm b. Name the special organ of excretion present in this organism. Nephridia c. Write one special characteristic feature of this organism with respect to its body structure. Its body is divided into ring-like segments, making it a segmented organism. Question 6: Answer the following. [1+2+2+2+3] (i) In the biology lab, a specimen was shown with dry scaly skin. The teacher also mentioned that this animal lays soft shelled eggs on land. Mention the class to which it belongs. [1] It belongs to the class Reptilia. (ii) Write one important function of the following structures a. Tube feet- Locomotion in echinoderms b. Tentacles- Catching food / Swimming in coelenterates (iii) A setup containing germinating seeds is arranged with a tube containing lime water. After some time, the lime water turns milky. a. What causes the lime water to turn milky? The lime water turns milky because of the release of carbon dioxide gas. b. What is the role of germinating seeds in this setup? The germinating seeds carry out respiration, releasing carbon dioxide as a byproduct, which makes the lime water turn milky. (iv) Shriya accidentally inhales a small insect. She starts coughing to remove it. Which type of epithelial tissue lines her respiratory tract, and how does it help expel foreign particles? The ciliated epithelium lines the respiratory tract. It cilia keeps lashing and move the substance in its contact. (v) A boy runs a 400-meter race and complains of pain in his leg muscles. The doctor explains that his muscles temporarily underwent anaerobic respiration. a. Name the by-product formed in his muscles due to this process. The by-product formed in his muscles is lactic acid. b. How is anaerobic respiration different from aerobic respiration in terms of energy release? Anaerobic respiration releases very little energy (2 ATP). Aerobic respiration releases a large amount of energy (38 ATP) ********************************************************************************** Page 6 of 6

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