The reaction involved is- 
ClCH₂COOH + NH₃ → NH₂CH₂COOH + HCl 
The product obtained is α-amino acetic acid which is commonly known as glycine.

Xenon hexafluoride hydrolyzes stepwise- 

XeF₆ + H₂O → XeOF₄ + 2 HF 

XeOF₄ + H₂O → XeO₂F₂ + 2 HF 

XeO₂F₂ + H₂O → XeO₃ + 2 HF

Molecular wt. of H₃PO₄=98g. in moles= 66/98= 0.673 mole

The human respiratory system comprises of two parts. They are the respiratory tract and a pair of lungs.

Common cold is caused by rhinoviruses. They cause inflammation of upper respiratory tract and release of mucus. There is no specific treatment for this.

If the vasa efferentia in human reproductive system gets blocked, the gametes will not be transported from testes to epididymis as the sperms are produced in seminiferous tubule, then transported to rete testis. From rete testis they reach vasa efferentia and then finally from vasa effrentia they are transported to epididymis. So if vasa efferentia gets blocked, sperms will not be transported from rete testis to epididymis as vas efferentia connects rete testis with epididymis.

Citrus comes under hesperidium. Fruits develop from polycarpellary, superior ovary. Epicarp contains oil glands while mesocarp is white and fibrous. Endocarp grows inwards and form several chambers. Numerous juicy unicellular placenta hairs develop on endocarp which are edible.

Edible part of mango is mesocarp and it is a drupe fruit.

Pheretima (Earthworm) derives its nutrition from soil that consist of decayed leaves, organic matter and algae. The organic matter is digested in the gut while the waste matter is excreted in the form of castings.

Polyembryony is defined as occurrence of 2 or more embryo in one ovule (one seed). Nucellar polyembryony is reported in species of citrus wherein the cells of nucellus and integuments develop into embryos which then lie in embryo sac and get nourishment from endosperm.

A copper containing oxidase which is widely distributed in plants, animals called Tyrosinase; It oxidizes tyrosine to melanin in mammals and darkens the cut surfaces of many fruits and vegetables .