Question

The secretes MIH, which inhibits the secretion of ecdysone X-organ CNS Y-organ Procuticle

Answer 1

1. Y organ

The steroid ecdysone secreted from the Y-organ stimulates moulting. After it is released into the blood, ecdysone is converted to a 20-hydroxyecdysone, which is the active moulting hormone.

2. indirect flight muscles are found in bees. Indirect flight muscles are connected to the upper (tergum) and lower (sternum) surfaces of the insect thorax.

3. All the choices are correct

Arthropods are very highly cephalized, often with intricate mouthparts and elaborate sensory organs, including statocysts, antennae, simple eyes and compound eyes.

Terrestrial arthropods possess tracheae and book lungs as respiratory organs which is quite efficient.

The exoskeleton completely covers the body of an arthropod. In a sense, an exoskeleton is like a suit of armour that protects the animal's soft body. For arthropods living on land, the exoskeleton keeps cells, tissues, and organs from drying out.

Metamorphosis reduces competition between adult and immature stages.

4. Onychophora

Onychophora is a phylum of elongate, soft-bodied, many-legged panarthropods. Unlike arthropods, velvet worms do not have an exoskeleton, hence their limbs have no need for joints to facilitate mobility.

Spiders (order Araneae) are air-breathing arthropods.

Crustaceans form a large, diverse arthropod taxon which includes such animals as crabs, lobsters, crayfish, shrimps, prawn etc

Myriapoda is a subphylum of arthropods containing millipedes, centipedes, and others.

5. Arthropods

Some cyclopoids, such as Mesocyclops, Metacyclops, and Thermocyclops, serve as intermediate hosts of the parasitic nematode.