Jkbose class 11th Biology Guess paper 2025 💯

Cell The Unit Of Life

Q.1: Define Cell Theory? What are the postulates of cell theory?
Q.2: Mitochondria & Chloroplast its ultrastructure & diagram?
Q.3: Difference Between SER & RER?
Q.4: Define the following?

• Nucleus.

• Golgi bodies.

• Lysosome.

Q.5: What are the Characteristics of prokaryotic cells?

Cell-Cycle & Cell Division

Q.1: Distinguish between cytokinesis from karyokinesis?
Q.2: What is Go (quiescent phase) of cell cycle?
Q.3: Why is Mitosis called equational division?
Q.4: Difference B/w Mitosis & Meiosis?
Q.5: Draw a well labelled diagram of cell cycle?
Q.6: How does cytokinesis in plant cells differ from that Animal cells?
Q.7: Define the following?

• Homologous chromosomes.

• Crossing Over.

• Synapsis.

• Chiasmata.

Q.8: Describe all the stages of Mitosis?

BIOMOLECULES

Q.1: illustrate a Glycosidic; Peptide & a Phosphodiester bond?
Q.2: What is meant by Tertiary structure of protein?
Q.3: Explain the composition of Triglyceride?
Q.4: Explain the Watson & Crick model of DNA?
Q.5: Define the following:

• Holoenzyme.

• Apoenzyme.

• Conjugated enzyme.

Q.6: What are the factors that affect enzyme activity?

BREATHING & EXCHANGE OF GASES

Q.1: Define vital capacity? What is its significance?
Q.2: Transport mechanism for CO2 & O2?
Q.3: Mechanism of Breathing?
Q.4: Define O2 dissociation curve?
Q.5: Define the following:

• Tidal volume.

• IRV.

• ERV.

• Vital capacity.

• Total lung capacity.

Q.6: Respiratory disorders:

• Bronchitis.

• Emphysema.

• Pneumonia.

BODY FLUIDS & CIRCULATION

Q.1: What is meant by double circulation? What is its significance.
Q.2: Sinoatrial node is called the Pacemaker of our heart? Why?
Q.3: Briefly describe the Cardiac cycle?
Q.4: Why do we call our heart myogenic?
Q.5: Difference between:

• Blood & Lymph.

• Open & closed circulatory system.

• Systole & Diastole.

Q.6: Explain Heart Sounds?
Q.7: Electro Cardiogram?

EXCRETORY PRODUCTS AND THEIR ELIMINATION

Q.1: Give a brief account of the counter current mechanism?
Q.2: Define the GFR?
Q.3: Osmoregulation?
Q.4: Structure of Nephron?
Q.5: Mechanism of urine formation?
Q.6: What is the significance of juxtaglomerular apparatus (JGA) in kidney function?
Q.7: Define The following:

• Glucosuria.

• Rena Calculi.

• Micturition.

Q.8: Haemodialysis?

LOCOMOTION & MOVEMENT

Q.1: Briefly describe the sliding filament theory of muscle contraction?
Q.2: Difference between:

• Actin & Myosin.

• Pelvic & Pectoral girdle.

• Skeletal muscle & cardiac muscle?

Q.3: Discuss all the types of joints?
Q.4: Define Amoeboid Movement & ciliary Movement?
NEURAL CONTROL & COORDINATION
Q.1: Briefly describe the structure of brain?
Q.2: Write a short note on CNS?
Q.3: What do you mean by Resting Potential & Action potential?
Q.4: Draw a well labelled diagram od Neuron?
Q.5: Explain:

• Polarization of the membrane of a nerve fibre.

• Depolarization of the membrane of a nerve fibre.

• Conduction of nerve impulse along a nerve firbe.

• Transmission of a nerve impulse across a chemical synapse.

CHEMICAL COORDINATION AND INTEGRATION

Q.1: What are Hormones? Explain:

• Hypothalamus.

• Pituitary gland.

• Adrenal gland.

• Thyroid.

• Pancreas.

• FSH

Q.2: Mechanism of Hormone Action?
Q.3: Explain:

• Diabetes Mellitus.

• Cretinism.

• Goiter.

ANIMAL KINGDOM

Q.1: All vertebrates are chordates but all chordates are not vertebrates? Justify the treatment?
Q.2: Importance of air bladder in Pisces?
Q.3: General characters of phylum:

• Annelida.

• Porifera.

Q.4: Difference between Chondrichthyes & Osteichthyes?
Q.5: Difference B/w Polyp & Medusa?
Q,6: What are the modification that are observed in birds that help than fly?
Q.7: Define the following:

• Indirect development.

• Coelom.

• Coral reef.

• Water vascular system.

STRUCTURAL ORGANISATION IN AMINALS

Q.1: How can a male frog be distinguished from a female frog?
Q.2: Give an account of the alimentary canal of frogs?