Question

Excretory organs of cockroach and the other insects are
A. Nephridia
B. Flame cells
C. Malpighian tubules
D. Gizzard

Answer 1

Hint: Excretion is the process by which metabolic wastes are removed from an organism. In humans, the kidneys, lungs, and skin provide this function. The principal excretory products in animals include ammonia, carbon dioxide, urea, uric acid, guanine, and creatine.
Excretion modes -
In mammals, there are five forms of excretion based on the excretory product. They are as follows:
1. Ammonotelism is a type of ammonotelism (Type of excretion- ammonia).
2. Ureotelism (urea excretion) is a type of excretion.
3. Uricotelism (uric acid excretion) is a condition in which uric acid is excreted.
4. Aminotelism (excretion of amino acids) is a type of excretion.
5. Guanotelism (guanine excretion) is a type of excretion.

Complete answer:
Option A: Nephridia is divided into two categories. Flatworms, ribbon worms, and rotifers have simpler, more primitive protonephridia that are usually distributed among the other body cells. Earthworms and other segmented invertebrates have more complex metanephridia, which are often paired.
So, option A is not correct
Option B: Flatworms, rotifers, and nemerteans have a specialised excretory cell called a flame cell, which is found in the simplest freshwater invertebrates.
So, option B is also incorrect
Option C: The cockroach's excretory organ is the malpighian tubules. It's where the midgut and hindgut collide. They are free to roam around in the hemolymph. It helps the hemolymph to rid itself of metabolic waste. It also absorbs extra water and solutes from the blood.
So, option C is correct
Option D: The gizzard, also called the ventriculus, gastric mill, or gigerium, is a digestive organ found in archosaurs, earthworms, some gastropods, some fish, and some crustaceans.
So, option D is incorrect

So, option C is the correct answer.

Additional information:
Excretory system in humans and insects

HUMANS	INSECTS
Liquid system tied in with the circulatory system. Includes kidneys and A urinary bladder.	The digestive tract is linked to this system, but it also includes the circulatory system.
Urine is the most common excretory product (all ages).	Uric acid is the most common excretory product (adults). The major product is affected by the environment.

Note:
Structures and Examples of Excretion-
Kidneys are found in all animals. Urea is an excretory product.
Planaria flame cells
Nephridia is a disease that affects earthworms.
Malpighian tubules are found in cockroaches.
Antennal glands or green glands are seen on prawns.