A zoology practice set covering animal structure, function, classification and behaviour. Work through the questions to revise the concepts you have studied, get familiar with how they are asked, and identify the topics worth another look.
The H-zone disappears during full contraction as actin filaments slide over myosin. 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: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.
The cortical reaction, which occurs immediately after the first sperm fuses with the oocyte, causes changes in the zona pellucida that prevent further sperm penetration.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
Octopus belongs to phylum Mollusca and is a member of class Cephalopoda. 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.
The somatic nervous system controls voluntary movements by transmitting impulses from the CNS to skeletal muscles. 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: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.
Balanoglossus is a hemichordate, characterized by a proboscis, collar, and trunk. 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.
Glycogen is the primary storage polysaccharide in animals and fungi. 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.
Chitin is a structural polysaccharide found in fungal ll walls and the exoskeleton of arthropods. 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.
The amnion is the membrane that forms the amniotic sac, which contains the amniotic fluid protecting the embryo. 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.
Homologous organs arise due to divergent evolution, not convergent evolution. 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: Evolution, Topic: Theories, Hardy-Weinberg principle and evidences.
Ribulose bisphosphate carboxylase-oxygenase (RuBisCO) is the most abundant protein in the biosphere. 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.
Adaptive radiation explains the formation of species from a common ancestor as they adapt to different geographical regions. 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: Evolution, Topic: Theories, Hardy-Weinberg principle and evidences.
The corpus luteum forms after ovulation and secretes progesterone, which prepares the endometrium for implantation. 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.
