Question:

Which one of the following option is true regarding the given statements ? I. The plant was introduced in India because of its beautiful flowers and shape of leaves. II. It can propagate vegetatively at a phenomenal rate and spread all over water body in a short period. III. It is very difficult to get rid off these plants.

Updated On: Jul 29, 2023
  • Dahlia
  • Water hyacinth
  • Azolla (water fern)
  • Mosses
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The Correct Option is B

Solution and Explanation

The correct answer is water hyacinth.

One of the most pervasive weeds is the aquatic plant known as "water hyacinth," which may grow everywhere there is standing water. It depletes the water's oxygen, which causes other aquatic life to perish. It spreads quickly throughout the water body and may reproduce vegetatively at an incredible rate, making it incredibly challenging to eradicate.

Any aquatic plant belonging to the genus Eichhornia in the family of pickerelweeds (Pontederiaceae), has roughly five species and is largely indigenous to tropical America. Some species are rooted to muddy stream banks and lakeshores, while others float in shallow water. They all feature thin rootstocks, feathery roots, stalked leaf rosettes, and a few to many blooms grouped in spikes or clusters in the leaf axils.

The most prevalent species is the common water hyacinth (E. crassipes). The top lobes of the purple blooms contain blue and yellow patterns, and their leafstalk is puffy and spongy. It swiftly reproduces and frequently clogs slow-moving streams. In outdoor swimming pools and aquariums, it is utilized as an adornment.

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Concepts Used:

Human Reproduction

Reproduction in human beings involves the fusion of male and female gametes that produces in their reproductive system.

Male Reproductive System:

The male reproductive system comprises:

  • Testicles (testes): A pair of oval-shaped organs masked in a pouch known as the scrotum. They manage the production of sperms and the male hormone testosterone.
  • Scrotum: It is a sac-like organ that hangs under the penis and behind it. It is the house of the testes, or testicles, and maintains a temperature that is needed for the production of sperm by it.
  • Vas deferens: The sperms produced in testes are stored in a tube known as the epididymis. Here the sperms get matured and pass to the urethra via the muscular tube known as vas deferens.
  • Accessory glands: This includes three glands, namely the prostate gland, seminal vesicles, and Cowper’s gland. The secretions from the mentioned three glands mix to form a fluid known as semen. Semen nourishes the sperm, raises the volume, and helps in lubrication.
  • Penis: The penis is a cylindrical tube that serves as both an excretory organ, and a reproductive organ. It transfers sperms into the vagina during sexual intercourse.

Female Reproductive System:

The female reproductive system is active before, during, and after fertilization as well. It comprises the following parts:

  • A pair of ovaries: A pair of ovaries produce and stores ovum in them. They also produce a female hormone known to be estrogen.
  • Fallopian tubes (Oviducts): They are the area of fertilization. They connect both the ovaries with the uterus.
  • Uterus: Uterus is the place of development for the embryo.
  • Vagina: The part that connects the cervix to the external female body parts is called a vagina. It is the passage for the penis during coitus as well as a fetus during transfer.