🧬 Biology Class 11 MCQ Questions

Set – 4 | General Science Practice for NEET & Other Competitive Exams

Boost your preparation with exam-focused Biology MCQs and instant answer verification – useful for NEET, AIIMS, JIPMER, and state-level exams

Q31. Darwin’s concept of natural selection primarily involves:
  • (A) Competition for resources
  • (B) Variation and struggle for existence
  • (C) Mutation of species
  • (D) Inheritance of acquired traits
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Correct answer is Variation and struggle for existence. Darwin’s natural selection emphasizes that species with favorable variations survive and reproduce.
Q32. Who first formulated the modern theory of evolution?
  • (A) Lamarck
  • (B) Darwin
  • (C) Wallace
  • (D) Spencer
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Correct answer is Darwin. Charles Darwin formulated the modern theory of evolution based on natural selection.
Q33. Current scientific evidence suggests life on Earth began approximately:
  • (A) 2 billion years ago
  • (B) 200 million years ago
  • (C) 20 million years ago
  • (D) 2000 years ago
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Correct answer is 2 billion years ago. Life on Earth is believed to have started approximately 2 billion years ago based on fossil evidence.
Q34. The earliest known organisms on Earth are believed to be:
  • (A) Blue-green algae
  • (B) Fungi
  • (C) Amoeba
  • (D) Euglena
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Correct answer is Blue-green algae. They are considered the earliest photosynthetic organisms on Earth.
Q35. Who gave the first comprehensive explanation for the evolution of life?
  • (A) Newton
  • (B) Einstein
  • (C) Charles Darwin
  • (D) Huxley
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Correct answer is Charles Darwin. Darwin provided the first comprehensive explanation of evolution through natural selection.
Q36. The main role of haemoglobin in the human body is to:
  • (A) Fight infections
  • (B) Transport oxygen
  • (C) Digest proteins
  • (D) Produce hormones
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Correct answer is Transport oxygen. Haemoglobin binds to oxygen in the lungs and delivers it to tissues.
Q37. In which organism is haemoglobin present dissolved in protoplasm rather than in blood cells?
  • (A) Fish
  • (B) Earthworm
  • (C) Human
  • (D) Frog
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Correct answer is Earthworm. Earthworms have haemoglobin dissolved directly in their blood plasma (protoplasm) rather than in cells.
Q38. Blood is classified as which type of tissue?
  • (A) Connective tissue
  • (B) Muscular tissue
  • (C) Epithelial tissue
  • (D) Nervous tissue
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Correct answer is Connective tissue. Blood is a specialized connective tissue that transports nutrients and oxygen.
Q39. Haemoglobin is:
  • (A) A plant pigment
  • (B) Substance in bone marrow
  • (C) Protein in human blood
  • (D) Hormone secreted by pituitary
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Correct answer is Protein in human blood. Haemoglobin is an iron-containing protein responsible for transporting oxygen in red blood cells.
Q40. What gives blood its characteristic red color?
  • (A) Plasma
  • (B) Haemoglobin
  • (C) Platelets
  • (D) White blood cells
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Correct answer is Haemoglobin. The red color of blood is due to haemoglobin, which contains iron that binds oxygen.
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