Subjectwise MCQ
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335 Biology GK MCQ question & Answer in English हिन्दी
Biology is the science that studies life and its physicochemical processes. The research is separated into numerous branches for convenience, including botany, zoology, morphology, etc. Let's do a fun quiz about life science that will help us better our knowledge and prepare for competitive exams.
Which hormone regulates blood glucose levels?
Insulin — lowers blood sugar.
Oxygen is carried in blood by:
Hemoglobin — in red blood cells.
The pacemaker of the heart is the:
SA node — initiates heartbeat.
Conjugation in bacteria involves:
Direct transfer — via pili.
Antibiotics are ineffective against:
Viruses — they target cellular machinery.
Which virus type carries reverse transcriptase?
Retrovirus — uses reverse transcription (e.g., HIV).
Bacteria that require oxygen are called:
Aerobes — need O₂ for metabolism.
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Phototropism is a plant response to:
Light — mediated by auxin distribution.
Which part of a flower becomes fruit?
Ovary — after fertilization, it develops into fruit.
Guard cells regulate stomatal:
Opening — controlling gas exchange/water loss.
Xylem transports:
Water and minerals — root-to-shoot movement.
Primary photosynthetic pigment in plants is:
Chlorophyll a — absorbs light in photosystems.
Proteins are made of:
Amino acids form polypeptides.
Which system defends against pathogens?
The immune system protects the body.
What is homeostasis?
It’s the balance of internal condition.
Where does gas exchange occur in lungs?
Alveoli have thin walls for diffusion.
The human heart's pacemaker is:
SA node initiates heartbeat.
The human heart's pacemaker is:
Hemoglobin binds O₂ in RBCs.
What molecule carries oxygen in red blood cells?
Hemoglobin binds O₂ in RBCs.
Guard cells surround:
They control stomatal opening.
Which tissue transports water in plants?
Xylem moves water upward.
The first products of the Calvin cycle?
G3P is the direct product.
Photosynthesis occurs in:
Chloroplasts contain chlorophyll for light absorption.
Lysosomes contain enzymes that:
They break down waste and materials.
The fluid mosaic model describes
It describes membrane components in fluid bilayer.
What structure maintains cell shape and structure?
The cytoskeleton comprises microtubules and filaments.
Which organelle modifies and packages proteins?
Golgi processes and ships proteins.
Mitochondria are the site of:
They produce ATP via respiration.
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