STD 11 - 19. Chemical coordination and integration — NEET STD 11 Science — Question

Metameric segmentation is the characteristic of

Urea in human urine is derived from the break down of

.......... is absent or highly reduced in cortical nephrons

Which of the following statements is correct about the origin and evolution of men ?

Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain

What we find in the galaxies?

Mechanisms of breathing vary among different groups of animals depending mainly on their habitats and levels of organisation, which option contain all correct statements ?
(i) Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange O₂ with CO₂ by simple diffusion over their entire body surface.
(ii) Earthworms use their moist cuticle for exchange O₂ with CO₂.
(iii) Insects have tracheal tubes to transport atmospheric air within the body.
(iv) Special vascularised structures called gills are used by most of the aquatic arthropods and molluscs.
(v) Terrestrial forms use vascularised bags called lungs for the exchange of gases.
(vi) Among vertebrates, fishes use gills whereas reptiles, birds and mammals respire through lungs and also use skin for respiration.

Statement I: Macrophages, leucocytes and microfilaments show amoeboid movement.
Statement II: Locomotion requires a perfect co - ordinated activity of muscular & neural systems only.

Which range of wavelength (in nm) is called photosynthetically active radiation (PAR) ?