This category holds zoology questions on animal groups, body systems and the processes that keep organisms functioning. It is built for practice: read the question, commit to an answer, then check it against the solution. Useful whether you are working through a syllabus or brushing up on weaker areas.
Uracil replaces thymine in RNA, whereas thymine is present in DNA. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Molecular Basis of Inheritance, Topic: Nitrogenous bases, uracil in RNA, thymine in DNA.
Parathyroid hormone (PTH) increases blood calcium levels by stimulating osteoclast activity. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
The binding of sperm to specific glycoproteins in the zona pellucida triggers the acrosomal reaction, releasing enzymes necessary for penetration. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
Hugo de Vries suggested that mutations cause large, sudden evolutionary changes, a process he termed ‘saltation’. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Evolution, Topic: Hugo de Vries, saltation, mutations as primary cause of evolution.
Aldosterone, a mineralocorticoid secreted by the adrenal cortex, increases sodium reabsorption in the kidneys. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Chemical Coordination and Integration, Topic: Aldosterone, mineralocorticoid, sodium reabsorption in kidney.
DNA probes are used in molecular diagnostics to detect specific DNA sequences by hybridizing with complementary sequences. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biotechnology and its Applications, Topic: DNA probes, molecular diagnostics, hybridization for detection.
Electroporation uses an electric field to create pores in the ll membrane, allowing DNA to enter animal lls. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biotechnology Principles and Processes, Topic: Gene transfer into animal cells, electroporation method.
PCR (Polymerase Chain Reaction) is used to amplify and detect very low amounts of nucleic acids. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
The Biodiversity Act in India protects biodiversity and prevents biopiracy by regulating the use of biological resources. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
The sternum is part of the axial skeleton, whereas the femur, scapula, and humerus belong to the appendicular skeleton. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
Embryonic genome activation typically begins during the blastocyst stage when the embryo starts transcribing its own genes. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
Homo habilis, also known as the ‘handy man, ’ was the first hominid to use stone tools. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
