Insectivorous plants are those that get some, all, or a large portion of their nutrients from catching and eating insects and other arthropods. Photosynthesis continues to provide some of the energy for insectivorous plants. Insectivorous plants have evolved to flourish in environments like acidic bogs where the soil is thin or deficient in nutrients, particularly nitrogen. They can be found on every continent, with the exception of Antarctica, and numerous Pacific islands. The insectivorous plants found in India include Drosera, Aldrovanda, Nepenthes (Pitcher), Utricularia, and Pinguicula. This article will explain to you about Insectivorous Plants in India which will be helpful in preparing the Environment Syllabus for the UPSC Civil Service exam.

What are Insectivorous Plants?

• These plants are commonly referred to as insectivorous plants since they are excellent at trapping insects.
• They have a totally distinct way of nutrition from normal plants. However, they never prey on people or big animals.
• Based on how they get their food, insectivorous plants can be roughly categorized as either active or passive varieties.
• When insects settle on their leaf traps, the active ones can immediately seal them. Aldrovanda is an example of an active type.
• The passive plants feature a device known as a "pitfall," which resembles a jar or pitcher and into which an insect can fall and finally be digested. Nepenthes is an excellent example of passive insectivorous plants.
• The insectivorous plants frequently use a variety of lures, including vivid colors, delicious secretions, and other curiosities, to attract unwitting victims.

What Makes a Plant Insectivorous?

If a plant exhibits five characteristics, it is said to be "insectivorous":

• If they use traps to catch the prey.
• If the captured prey is killed.
• If they digest the prey that is captured.
• If the killed and digested prey provides them with nutrition.
• If they use those nutrients to grow and develop.

Other features may involve attracting and holding prey.

Why Do They Hunt Despite Having Normal Roots and Photosynthetic Leaves?

• These plants are typically found in wet, acidic, water-logged locations with nutrient-poor soils that have been washed by rain.
• These wetlands are acidic because anaerobic circumstances cause organic materials to partially decompose, releasing acidic substances into the environment.
• Therefore, the majority of microorganisms required for the complete decomposition of organic matter cannot survive in such anoxic conditions.
• Ordinary plants struggle to live in such nutrient-deficient environments.
• In such scenarios, hunter plants thrive because they capture insects and consume their nitrogen-rich bodies to boost their photosynthetic food production.

Insectivorous Plants in India/ The Indian Hunters

Drosera or Sundew

• Drosera, also referred to as sundews, is one of the largest genera of insectivores (carnivorous) plants, with at least 194 species.
• These members of the Droseraceae family use stalked mucilaginous glands on the surface of their leaves to attract, catch and eat insects.
• The insects are utilized as a supplement to the plants' inadequate mineral nutrition in the soil.
• All continents, with the exception of Antarctica, are home to a variety of these species that differ widely in size and form.
• Their leaves develop long tentacles, each of which has a sticky gland at the tip.
• Drosera or sundew thrive in marshy or moist infertile soils.
• The single species of Aldrovanda, a rootless, free-floating aquatic plant, is found in the salt marshes of the Sundarbans, south of Calcutta.

*To know more about the topic, click this link Drosera or Sundew

Aldrovanda

• Aldrovanda also referred to as the waterwheel plant is an insectivorous plant.
• It is the only surviving species in the flowering plant genus of the family Droseraceae.
• This plant uses traps to catch small aquatic creatures.
• The traps are organized in whorls around a stem that is in the center and free to float.
• This is one of the few plant species with the ability to move rapidly.
• The only species of Aldrovanda, a rootless, free-floating aquatic plant, is found in the salt marshes of the Sundarbans, south of Calcutta.
• It can also grow in bodies of fresh water like lakes, tanks, and ponds.

*To know more about the topic, click this link Aldrovanda

Nepenthes

• Nepenthes is a genus of insectivore plants sometimes referred to as monkey cups or tropical pitcher plants.
• There are about 140 species, most of which are indigenous to Australia, Madagascar, and Southeast Asia.
• Although some are epiphytes, Nepenthes species are perennial herbaceous plants that usually flourish in extremely acidic soil.
• The majority of the Nepenthes species are located in the Malay Archipelago, with Borneo, Sumatra, and the Philippines having the highest biodiversity, particularly in the Borneo montane rain forests.
• Nepenthes khasiana, an evergreen shrub considered to be native to Meghalaya, is the only species of pitcher plant known to exist in India.
• However, in the neighboring state of Assam's Dima Hasao district, it was reported in 2016.

*To know more about the topic, click this link Nepenthes

Utricularia or Bladderworts

• Utricularia is a genus of carnivorous plants with over 233 species that are generally known as bladderworts.
• Except for Antarctica, they are found as terrestrial or aquatic species in freshwater and moist soil.
• Small hollow sacs that actively collect and digest microscopic creatures including insect larvae, aquatic worms, and water fleas are characteristic of the bladderwort genus.
• Many bladderwort species are invasive species that have spread to new habitats, and they can be found in lakes, streams, and waterlogged soils all over the world.
• In contrast to Venus flytraps, waterwheels (Aldrovanda), and many sundews, the trapping mechanism of Utricularia is entirely mechanical; no reaction from the plant (irritability) is necessary for the presence of prey (Drosera).
• The continual pumping of water out through the bladder walls by active transport is the only active process involved.

*To know more about the topic, click this link Utricularia or Bladderworts

Pinguicula or Butterwort

• Pinguicula, also referred to as butterworts, is a genus of carnivorous flowering plants in the Lentibulariaceae family.
• In order to supplement the inadequate mineral nutrition they receive from their environment, they use sticky, glandular leaves to attract, catch, and digest insects.
• Out of the roughly 80 species currently identified, 13 are native to Europe, 9 are native to North America, and some are native to northern Asia.
• South and Central America are the continents with the most species.
• These plants use mucilage, which is generated by glands on the surface of the leaf, to produce sticky or adhesive compounds that are used to attract and capture prey.
• The leaf of a butterwort uses two specialized glands that are dispersed around the leaf surface to collect and digest insects.

*To know more about the topic, click this link Pinguicula or Butterwort

Insectivorous Plants - Medicinal Properties

• Drosera: As early as the 12th century, an Italian physician from the School of Salerno named Matthaeus Platearius reported sundews as a therapeutic herb for coughs under the name herba sole.
  • Recent research has demonstrated that drosera has anti-inflammatory and antitussive properties.
  • Milk can be curdled by Drosera, whose bruised leaves are applied to blisters and used to color silk.
• Nepenthes: Nepenthes is used in traditional medicine to cure cholera patients, and the liquid within the pitcher is also used as eye drops and for urinary problems.
  • Nepenthes also has long been used as a traditional remedy to cure diabetes, high blood pressure, hepatitis, gastric ulcers, ureteral stones, diarrhea, and jaundice.
• Utricularia: Utricularia is beneficial for treating wounds, and coughs, and curing urinary diseases.
  • Medicinal tea is brewed using the dried leaves of Utricularia.
  • Additionally, they use it to treat edema and fluid retention, as well as to assist in weight loss and boost gallbladder discharges.
  • For burns and swelling, they are occasionally applied straight to the skin (inflammation).

Insectivorous Plants - Threats

• One of the main factors contributing to their decline is gardening trading for medicinal benefits.
• The wetlands that support these plants are the principal victims of the increase in urban and rural habitation, which is another major cause of habitat degradation.
• Since insectivorous plants cannot tolerate high nutrient levels, pollution caused by effluents containing detergents, fertilizers, pesticides, sewage, etc. into the wetlands is another major factor in their decline.
• Additionally, polluted water bodies are dominated by prodigious water weeds, which eliminate the delicate insectivorous plants.

Conclusion

IUCN classifications for plant species indicate that almost half of the insectivorous plants are threatened (vulnerable, endangered, or critically endangered). The aim of conservation research is also to further quantify the risks of extinction as well as the consequences of hazards, such as pollution, on carnivorous plants. According to the IUCN, just 17% of species had been evaluated as of 2011. The preservation of carnivorous plants would aid in the maintenance of significant ecosystems and stop the secondary extinction of specialist species that depend on them, such as foundation species that may seek refuge from or depend on specific plants for their survival. According to research, a comprehensive strategy aimed at the habitat level of carnivorous plants may be necessary for effective conservation.