CBSE Questions for Class 11 Medical Biology Structural Organisation In Animals Quiz 13 - MCQExams.com

Chloragogen cells of Pheretima, earthworms are yellowish appearing organelles. They store glycogen and have a role in neutralizing toxins similar to the way vertebrate liver does.

So, the correct option is 'Liver'.

• The gizzard grinds food one more time before it enters the stomach. The crop opens into a short, muscular organ, the gizzard where the grinding of food takes place.
• Crop holds swallowed food until a toothy section of the digestive tract called the proventriculus, can pulverize it. 
• Mesenteron also called the midgut functions mainly for digestion. It is lined with enzyme-secreting tissue and serves as the main site of digestion and absorption. 
• The oesophagus is also called the gullet, is the part of the gastrointestinal system between the mouth and the stomach. It connects the pharynx and the stomach. The oesophagus can contract or expand to allow for the passage of food. 

A) Haemoglobin is a protein present in RBCs that carries oxygen. It is an iron-containing molecule that provides red colour to blood.

B) Haemocyanin is a molecule used by various invertebrates to carry oxygen throughout their bodies and uses copper instead of iron. It is found in snails, spiders, and lobsters. The presence of copper ions in blood gives blood a blue colour.

C) Erythrocruorin is an enormous molecule of haemoglobin found in annelids like Pheretima that is used to carry oxygen to various parts of the body.

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• The mouth of the cockroach opens into the pharynx to the oesophagus. The oesophagus is a thin-walled structure and continues into the crop where food is stored.
• Crop opens into a gizzard which is a thick-walled rounded structure responsible for grinding the food.
• Maximum digestion takes place in the mesenteron of a cockroach. Mesenteron also called the midgut functions mainly for digestion. It is lined with enzyme-secreting tissue and serves as the main site of digestion and absorption. 

• Oenocytes are ectodermic cells present in the fat body of several insect species. 
• The cells are thought to have a specialized secretory function.

A.Correct option A

B.Explanation for correct option:

The coelom in the earthworm is not a continuous cavity but is divided into compartments by a transverse circular partition, the septa.
In Pheretima, i.e. earthworms, septa are present all over the body except for 3/4 and 9/10 segments of the body

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• Skeletal muscle is a type of striated muscle tissue. It is under the voluntary control of the somatic nervous system. 
• It is one of three major muscle types, the others being cardiac muscle and smooth muscle. 
• An average adult male is made up of 42% of skeletal muscle and an average adult female is made up of 36% skeletal muscle.
•  It also has striations, unlike smooth muscle. 
• Hence the correct option is A.