13 public questions tagged with this topic.
Malpighian tubules are the excretory structures in insects, helping in nitrogenous waste removal and osmoregulation. 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.
Hymenoptera including honeybees, ants and wasps lack heteromorphic sex chromosomes and determine sex via haplodiploid fertilization status conceptually distinct from X:A or ZZ/ZW. Diploid fertilized eggs heterozygous at complementary sex determiner locus csd produce females, either workers or queens, while haploid unfertilized eggs hemizygous become males drones. Molecular mechanism csd complementation regulates feminizer gene transformer ortholog splicing into female form producing DsxF, whereas hemizygous genotype yields male splicing and DsxM. Queen controls fertilization voluntarily releas
Ref: Gilbert, Developmental Biology, 12th ed., Chapter 6: Fertilization-dependent sex in Hymenoptera.
According to NCERT, insects constitute more than 70% of all described animal species, making them the largest group.
Ref: NCERT Class 12 Biology Chapter 13: Biodiversity and Conservation Patterns of Biodiversity - Latitudinal Gradients
Bt toxin is specific to certain insect pests and does not affect all organisms equally.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Bt Crops - Cotton Brinjal Corn
Cry protein produced by Bacillus thuringiensis is toxic to insect larvae and is used in pest-resistant_x000D_ crops.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Bt Crops - Cotton Brinjal Corn
Cry protein produced by Bacillus thuringiensis is toxic to insect larvae and is used in pest-resistant_x000D_ crops.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Agricultural Applications - Bt Crops - Cotton Brinjal Corn
Coleoptera meaning sheath-wing forms largest insect order beetles and weevils with about 400,000 described species. Defining feature is forewings hardened into elytra, convex shields meeting in straight mid-dorsal suture protecting hind membranous wings folded transversely beneath when at rest, plus protecting dorsal abdomen against desiccation, abrasion and predation. Hind wings provide flight; elytra lift during takeoff. Chewing mouthparts common. Diptera flies possess one pair wings, Lepidoptera butterflies have scaled wings, Hymenoptera bees have membranous wings linked by hamuli. Elytral
Ref: Campbell Biology, 12th ed., Chapter 33: Coleoptera; NCERT Class 11, Chapter 4, Insect Orders
Order Diptera, true flies, mosquitoes, gnats and midges, is distinguished by presence of single pair of functional membranous forewings responsible for powered flight, while hind wings reduced to halteres, small knobbed club-shaped balancing organs vibrating rapidly providing gyroscopic feedback to thoracic ganglia for flight stability. Name di meaning two and ptera wings signifies two wings. Mouthparts vary from sponging in housefly to piercing in mosquito. Two wing pairs typify most Pterygota, scaly wings depict Lepidoptera, winglessness occurs in parasitic lice. Haltere innovation enables e
Ref: Brusca & Brusca, Invertebrates, 3rd ed., Diptera; Campbell Biology, 12th ed., Chapter 33, Insect Orders
Complete metamorphosis or holometaboly characterizes Endopterygota superorder including Diptera flies, Lepidoptera butterflies moths, Coleoptera beetles, Hymenoptera bees wasps and Neuroptera lacewings. Life cycle comprises egg, actively feeding but morphologically distinct larva such as caterpillar or maggot, non-feeding pupa where larval tissues undergo histolysis and imaginal discs differentiate into adult organs, and reproductive adult imago. Larval and adult niches often diverge reducing intraspecific competition. Hemimetabolous insects show incomplete nymphal development, Apterygota amet
Ref: Campbell Biology, 12th ed., Chapter 33: Insect Metamorphosis Holometaboly; NCERT Class 11, Chap 4
Apterygota includes primitively wingless hexapods that never evolved wings throughout their lineage, comprising orders Archaeognatha jumping bristletails and Zygentoma silverfish and firebrats. Characteristics include ametabolous development without distinct nymphal change except size, monocondylic mandibles with single articulation, abdominal styli, continuous molting even after sexual maturity and lack of flight musculature. Pterygota comprise winged insects and secondarily wingless groups like fleas and lice that secondarily lost wings. Apterygote condition reflects ancestral hexapod state
Ref: Brusca & Brusca, Invertebrates, 3rd ed., Apterygota; NCERT Class 11, Chapter 4, Insect Classification
Insect thorax comprises three segments prothorax, mesothorax and metathorax, each originating one pair of jointed legs, thus hexapod condition totals six legs universally diagnostic for Insecta or Hexapoda. Leg segmentation includes coxa, trochanter, femur, tibia, tarsomeres with claws, variably modified for running, jumping as in saltatorial orthopterans, grasping or digging. Wing articulation occurs dorsally on meso- and metathorax in winged pterygotes. Sternal, pleural and tergal sclerites anchor powerful flight and leg muscles. Six-legged thoracic arrangement differentiates insects from ei
Ref: NCERT Class 11 Biology, Chapter 4: Insecta Morphology; Campbell Biology, 12th ed., Chapter 33
