Life Science (জীবনবিজ্ঞান)
5 chapters · 60 practice questions with full solutions — all free.
🎯 Full Life Science (জীবনবিজ্ঞান) section test
40 questions across the whole section · 40 min · one timed test
Control and Coordination in Living Organisms (জীবজগতে নিয়ন্ত্রণ ও সমন্বয়)
Control and coordination means responding to stimuli and keeping all body activities in harmony. Plants do this through movements and plant hormones (phytohormones), while animals use hormones from endocrine glands together with the nervous system and sense organs such as the eye. The chapter ends with movement and locomotion in Paramecium, Euglena, fish, birds and humans.
Exam tip: This chapter carries about 19 marks: 3 MCQs, 5 very short answers, 3 two-mark and 1 five-mark question. Very short items usually ask 'which hormone or gland', column matching of hormones with glands or deficiency disorders, and eye defects with their corrective lens, so learn these pairs and the path of the reflex arc thoroughly.
12 questionsPractice testContinuity of Life (জীবনের প্রবহমানতা)
Life continues from generation to generation through cell division and reproduction. This chapter covers the cell cycle, mitosis and meiosis, asexual and vegetative reproduction, sexual reproduction in flowering plants (pollination and double fertilisation), and growth and development in humans.
Exam tip: This chapter carries about 17 marks. MCQs and very short answers mostly come from the phases of the cell cycle, mitosis versus meiosis, examples of vegetative propagation and agents of pollination; long answers often ask the stages of mitosis or double fertilisation, so learn one example for every type of reproduction.
12 questionsPractice testHeredity and Some Common Genetic Diseases (বংশগতি এবং কয়েকটি সাধারণ জিনগত রোগ)
Heredity is the passing of characters from parents to offspring through genes. Mendel's experiments on the garden pea gave the laws of segregation and independent assortment, explained with monohybrid and dihybrid crosses. The chapter also covers incomplete dominance, sex determination in humans and the genetic diseases thalassaemia, haemophilia and colour blindness.
Exam tip: This chapter carries about 15 marks. MCQs and very short answers usually test Mendel's ratios (3 : 1, 1 : 2 : 1, 9 : 3 : 3 : 1, 1 : 1), terms such as allele, homozygous and phenotype, and which disease is X-linked; the 5-mark question is often a monohybrid or dihybrid cross with a checkerboard, so practise drawing it neatly.
12 questionsPractice testEvolution and Adaptation (অভিব্যক্তি ও অভিযোজন)
Evolution is the slow, continuous change by which complex living forms arose from simpler ancestors. This chapter covers the chemical origin of life (Oparin-Haldane theory and the Miller-Urey experiment), evidences of evolution, the theories of Lamarck and Darwin, adaptations of plants and animals to their surroundings, and animal behaviour such as the dance of honeybees.
Exam tip: This chapter carries about 15 marks. MCQs and very short answers often ask who proposed what (Oparin-Haldane, Miller-Urey, Lamarck, Darwin, Spencer, Karl von Frisch), examples of homologous, analogous and vestigial organs, and one adaptive feature of Opuntia, Sundari, fish or pigeon; long questions often compare Lamarckism with Darwinism.
12 questionsPractice testEnvironment, its Resources and their Conservation (পরিবেশ, তার সম্পদ এবং তাদের সংরক্ষণ)
This chapter, the highest-scoring one in Madhyamik Life Science (24 marks), studies how human beings interact with the environment. It covers the nitrogen cycle, the effects of air, water and noise pollution on human health and biodiversity, the management of natural resources such as soil, water and forests, and biodiversity itself - its hotspots, the threats to it and its in-situ and ex-situ conservation, including people's efforts such as Chipko, the Bishnois and Joint Forest Management (JFM).
Exam tip: With 24 marks this is the heaviest chapter of the Life Science paper: 3 MCQs, 5 very short answers (fill in the blanks, true/false, column matching, one word), three 2-mark and two 5-mark questions. Long answers commonly ask the steps of the nitrogen cycle with the bacteria named, the effects of pollution on health or biodiversity, the difference between in-situ and ex-situ conservation, and the role of JFM, Chipko or the Bishnois - learn the bacteria names and the West Bengal examples exactly.
12 questionsPractice test