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ZOOLOGY

This category covers zoology questions on animal life, including classification, structure and anatomy, physiology and the processes that keep organisms alive. It suits students revising the animal biology portion of their syllabus who want to check recall and understanding topic by topic.

45 questions

Which of the following statements is correct?

Adaptive radiation results in species diversity as organisms adapt to different ecological niches from a common ancestor. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

Which phylum includes animals with an open circulatory system and hemocoel?

Arthropods have an open circulatory system where blood flows into a hemocoel instead of being confined to vessels. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Animal Kingdom, Topic: Basis of classification and salient features of phyla.

Which respiratory disorder is caused by chronic exposure to pollutants and results in inflammation of the bronchi?

Bronchitis is a respiratory disorder characterized by inflammation of the bronchi due to prolonged exposure to pollutants. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

Which of the following statements about ATP is correct?

ATP is the main energy carrier in lls. It is not an enzyme, does not contain peptide bonds, and can be regenerated. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

Which of the following statements about ATP is incorrect?

ATP provides energy through the hydrolysis of phosphate bonds, not peptide bonds. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

Which human ancestor had a brain capacity of around 900 cc and used fire?

Homo erectus had a brain capacity of around 900 cc and was the first to use fire. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

Which of the following statements about autoimmune diseases is incorrect?

Autoimmune diseases are not directly caused by viral infections; they result from immune system dysfunction. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Health and Disease, Topic: Immunity, diseases and health maintenance.

Which of the following contraceptive methods involves the use of chemicals to kill sperms?

Spermicidal creams contain chemicals that kill sperms, thereby preventing fertilization. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Reproduction and Reproductive Health, Topic: Gametogenesis, menstrual cycle and reproductive strategies.

Which condition is caused by the hyposecretion of thyroid hormones in adults?

Myxedema is caused by hypothyroidism in adults, leading to lethargy, weight gain, and slow metabolism. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Physiology - Digestion, Respiration, Circulation, Neural Control and Chemical Coordination, Topic: Organ system functions and hormonal regulation.

Which of the following statements about nucleic acids is correct?

RNA is usually single-stranded, while DNA is double-stranded and contains deoxyribose sugar. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Principles of Inheritance, Molecular Basis of Inheritance and Biotechnology, Topic: Genetics, DNA techniques and applications.