Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Chondrichthyes are primarily found in which habitat?
The NCERT line 'The Chondrichthyes are fishes with cartilaginous endoskeleton and are marine' clearly indicates their habitat.
The endoskeleton of Chondrichthyes is composed of:
The class name itself (Chondrichthyes) refers to cartilage, and the NCERT states, 'They are marine animals with streamlined body and have cartilaginous endoskeleton'.
Which of the following features contributes to the predatory nature of Chondrichthyes?
The NCERT text describes, 'Their jaws are very powerful. These animals are predaceous.' While a streamlined body helps in movement, powerful jaws are directly linked to their predatory lifestyle.
Chondrichthyes are grouped under 'Pisces' along with Osteichthyes because they both:
The NCERT states, 'Classes Chondrichthyes and Osteichthyes bear fins for locomotion and are grouped under Pisces.' This is the common feature for their grouping.
Which of the following statements correctly describes active immunity?
According to the NCERT text, 'Active immunity is slow and takes time to give its full effective response.' Options o1 and o2 describe passive immunity, and o4 is an example of passive immunity.
An individual is protected against snake venom by an injection of anti-venom. This is an example of:
The NCERT states, 'When ready-made antibodies are directly given to protect the body against foreign agents, it is called passive immunity.' Anti-venom contains pre-formed antibodies, so it's a classic example of passive immunity.
Which of these is NOT an example of passive immunity?
The NCERT states, 'infectious organisms gaining access into body during natural infection induce active immunity.' Options o1 and o2 are explicitly mentioned as examples of passive immunity in the text, and o4 describes the direct administration of antibodies, which is passive immunity.
What kind of immunity is developed when an individual receives a vaccine containing inactivated pathogens?
Vaccination involves introducing antigenic proteins or inactivated/weakened pathogens (foreign agents) into the body to stimulate antibody production by the host, which is active immunity. Since it's deliberately induced, it's artificially acquired. The text states, 'Injecting the microbes deliberately during immunisation... induce active immunity'.
Colostrum, the yellowish fluid secreted by the mother during the initial days of lactation, provides passive immunity primarily due to the abundance of which antibody?
The NCERT explicitly mentions, 'The yellowish fluid colostrum secreted by mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant.'
A key characteristic differentiating active immunity from passive immunity is that active immunity:
Active immunity is defined by the host producing its own antibodies when exposed to antigens. The text states, 'When a host is exposed to antigens... antibodies are produced in the host body. This type of immunity is called active immunity.' Passive immunity provides immediate protection and involves pre-formed antibodies (not memory).
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.