Water hycinth.Water hyacinth (Eichhornia crassipes) is used for purifying not only domestic wastewater but also industrial wastewater. Other studies have evaluated the potential of water hyacinth to absorb various organic chemicals like phenols & toxaphene. It can readily absorb, accumulate & concentrate heavy metals such as lead, cadmium, mercury & nickel. Water hyacinth can remove even radioactive metals from industrial effluents, which is very difficult otherwise.
transport of water.Xylem is one of the two types and categories of transport tissue in vascular plants, phloem being the other. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants. The basic function of xylem is to transport water from roots to shoot & leaves, but it also transports some dissolved nutrients.
When the fertilisation is external & development is internal.. In vitro fertilization (IVF) is a process by which an egg is fertilized by sperm outside the body: in vitro. Test tube baby is born from in vitro fertilization. When a woman's natural cycle is monitored to collect a naturally selected ovum (egg) for fertilization, it is known as natural cycle IVF. The fertilized egg (zygote) is then transferred to the patient's uterus with the intention of establishing a successful pregnancy.
Tube feet.Starfish carry out movements with the help of tube feet that are part of the water vascular system. The water vascular system serves to transport oxygen from, & carbon dioxide to, the tube feet & also nutrients from the gut to the muscles involved in locomotion. Apart from their function in locomotion, the tube feet act as accessory gills.
AB-group.If a person belongs to the blood group AB, he has both A & B antigens on the surface of his red blood cells & no A or B antibodies at all in his blood plasma. So he can donate blood to those having AB blood group; but can receive blood from AB, A, B, & O groups.
C. The non-use of chemical fertilizers & pesticides
D. Soil is nurtured for furture use by maintaining micro-organisms
Answer & Explanation
Answer : Option
Use of synthetic fertilizers.Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost, & biological pest control. It uses fertilizers & pesticides if they are considered natural (such as bone meal from animals or pyrethrin from flowers), but it excludes the use of synthetic petrochemical fertilizers & pesticides, plant growth