BS Zoology Semester Exam MCQs

Diapause is a developmental arrest synchronized with seasonal stress such as cold or drought. Hormonal control helps insects survive until conditions improve.

A spermatheca allows females of many insects to store sperm after mating. Stored sperm may fertilize eggs later, improving reproductive flexibility.

Diapause is a developmental arrest synchronized with seasonal stress such as cold or drought. Hormonal control helps insects survive until conditions improve.

Ganglia act as local control centers. Insects can coordinate segmental movements through thoracic and abdominal ganglia, sometimes even with partial independence from the brain.

Tympanal organs detect airborne sound vibrations. They occur in different body regions depending on the insect group and are important in communication and predator detection.

Insect endocrine glands release hormones that coordinate growth, molting, metamorphosis, reproduction, and other physiological processes.

Complete metamorphosis includes egg, larva, pupa, and adult. Larvae and adults often use different foods and habitats, reducing competition within the species.

Photoreceptors detect light and begin visual processing. They occur in compound eyes and ocelli, helping insects respond to movement, day length, and orientation cues.

Johnston's organ is located in the pedicel of the antenna. It detects antennal movements and is important in hearing or flight-related sensory feedback in some insects.

Ecdysone is a major molting hormone. It activates events leading to apolysis, new cuticle formation, and eventual shedding of the old cuticle.

Incomplete metamorphosis lacks a pupal stage. Nymphs gradually develop adult structures through successive molts.

Photoreceptors detect light and begin visual processing. They occur in compound eyes and ocelli, helping insects respond to movement, day length, and orientation cues.