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- Question
Radioactivity is a phenomenon of the spontaneous emission of
Options- A. protons (alpha particles)
- B. electrons (beta particles)
- C. gamma rays (short wave electromagnetic waves)
- D. All of the above
- Correct Answer
- All of the above
- 1. Photosynthesis is a process
Options- A. reductive and exergonic
- B. reductive and catabolic
- C. reductive, endergonic and catabolic
- D. reductive, endergonic and anabolic Discuss
- 2. Rain water helps to increase the ____ to some extent.
Options- A. phosphorous contents
- B. nitrogen contents
- C. calcium contents
- D. potash contents Discuss
- 3. Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by
Options- A. Robert Hooke
- B. Robert Brown
- C. Rudolf Virchow
- D. Theodore Schwann Discuss
- 4. Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called
Options- A. flavoxanthin
- B. melanin
- C. carotene
- D. Xanthophyll Discuss
- 5. Neurospora is used as genetic material because
Options- A. it has short life cycle of 10 days
- B. the product of single meiosis can be easily analysed
- C. meiotic products are linearly arranged in the form of ordered tetrads
- D. is a diploid fungus Discuss
- 6. Prothrombin which helps in clotting of blood is released by
Options- A. lymphocytes
- B. erythrocytes
- C. monocytes
- D. blood platelets Discuss
- 7. Poison glands of snakes are homologous to
Options- A. electric organs of fishes
- B. stings of rays
- C. sebaceous glands of mammals
- D. salivary glands of vertebrates Discuss
- 8. Plants that grow under average temperature and moisture are called
Options- A. halophytes
- B. hydrophytes
- C. mesophytes
- D. xerophytes Discuss
- 9. Potato is a modified form (outgrowth) of
Options- A. root
- B. stem
- C. fruit
- D. leaf Discuss
- 10. Oxygen in our blood is transported by a protein named
Options- A. haemoglobin
- B. keratin
- C. collagen
- D. myoglobin Discuss
Biology problems
Search Results
Correct Answer: reductive, endergonic and anabolic
Correct Answer: calcium contents
Correct Answer: Robert Brown
Correct Answer: melanin
Correct Answer: it has short life cycle of 10 days
Correct Answer: blood platelets
Correct Answer: salivary glands of vertebrates
Correct Answer: mesophytes
Correct Answer: stem
Correct Answer: haemoglobin
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