Question Bank - Environmental Studies

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Which of the following is NOT an insectivorous plant :

A.
Dionea
B.
Nepenthes
C.
Ageratum
D.
Sundew

Solution:

The correct answer is Ageratum.Concept:Carnivorous plants obtain the essential nutrients from the heterotrophs.These plants trap insects and obtain the nutrients which they do not get from the soil as they grow in nitrogen-deficient soils.They are not called heterotrophs or consumers, because they only derive nutrients from insects.These plants get energy from the process of photosynthesis.Hence they are both producers and carnivores.Explanation:Some of the examples of insectivorous plants are - Drosera, Venus Flytrap (Doinea), Nepenthes, Pinguicula, Genlisea.Here, Ageratum is not a carnivorous plantAgeratum:Ageratum, (genus Ageratum), also called whiteweed, any of about 40 species of herbs in the genus Ageratum (family Asteraceae).Native to the Americas, but primarily in Mexico and tropical South America, Ageratum species can be annuals or perennials.They have toothed ovate leaves arranged oppositely along the stem.Similar to most members of Asteraceae, they feature composite flower heads composed of blue, pink, lilac, or white discoid flowers.These flowers produce small dry fruits with minute seeds.Additional InformationIt has a Pitcher-like structure that is the modified part of the leaf.The apex of the leaf forms a lid that can open and close the mouth of the pitcher.Inside the pitcher, there are hairs that are directed downwards.When an insect lands in the pitcher, the lid closes and the trapped insect gets entangled in the hair.The insect is digested by the digestive juices secreted in the pitcher.It can trap and eat frogs, insects and even mice.It is found in Australia, Indonesia and Meghalaya in India.It has a pitcher-like shape and the mouth is covered by a leaf.It has a special smell that attracts insects to it, which get trapped and can't get out.?PlantTrapping techniquePitcher plantLeaves transformed into a slippery deep pool containing digestive juices.Insects fall into these pools and plant digests them.Venus Flytrap (Dionea)It has snap traps, which snap shut when touched by insects.SundewIt has a sticky substance on its surface that looks like dews.The insect gets stuck on it and digestive juices digest it by the time.

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