Home
Class 12
BIOLOGY
Read the given statements about the bloo...

Read the given statements about the blood vascular system of cockroach.
I. The circulatory system of cockroach is of closed type
II. It contains no blood vessels except aorta of the heart .
III. The heart is 6 - chambered.
IV The haemolymph is composed of coloruless plasma and haemocytes.
Which of the statement (s) given above is / are INCORRECT ?

A

only I

B

I,II and III

C

I and III

D

only IV

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about the blood vascular system of cockroaches are incorrect, let's analyze each statement one by one. ### Step 1: Analyze Statement I **Statement I:** The circulatory system of cockroach is of closed type. - **Analysis:** This statement is **incorrect**. Cockroaches have an open circulatory system, not a closed one. In an open circulatory system, the blood (hemolymph) is not confined to blood vessels and bathes the organs directly. ### Step 2: Analyze Statement II **Statement II:** It contains no blood vessels except aorta of the heart. - **Analysis:** This statement is **correct**. In cockroaches, there are no true blood vessels as seen in closed circulatory systems; the hemolymph flows through sinuses and the only significant vessel is the aorta. ### Step 3: Analyze Statement III **Statement III:** The heart is 6-chambered. - **Analysis:** This statement is **incorrect**. The cockroach heart is actually 13-chambered, which is a characteristic of its anatomy. ### Step 4: Analyze Statement IV **Statement IV:** The hemolymph is composed of colorless plasma and haemocytes. - **Analysis:** This statement is **correct**. Hemolymph in cockroaches consists of a fluid component (plasma) and cells (haemocytes) that play roles in immune response and transport. ### Conclusion Based on the analysis: - **Incorrect Statements:** I (closed type) and III (6-chambered heart). - **Correct Statements:** II (no blood vessels except aorta) and IV (hemolymph composition). ### Final Answer The incorrect statements are I and III. ---
Promotional Banner

Topper's Solved these Questions

  • NTA NEET SET 83

    NTA MOCK TESTS|Exercise BIOLOGY|90 Videos

  • NTA NEET SET 86

    NTA MOCK TESTS|Exercise BIOLOGY|90 Videos

Similar Questions

Explore conceptually related problems

Read the given statements aboue blood vascular system of cockraoch. I. It is of closed type. II. It contains no blood vessels except aorta. III. Heart is 6 chambered. IV. The haemolymph is composed of colourless plasma and haemocytes. Choose the option with the incorrect statements.

Read the given statements in reference to the digestive system of cockroach. I. Alimentary canal is divided into three regions. II. Oesophagus opens into a sac - like structure called crop. III. The hindgut is broader than midgut. IV. The rectum opens through the anus. Which of the statements given above is/are incorrect ?

Given the name of blood vessel, which arises from first chamber of heart in cockroach :

Consider the following statements. I. Salamander are cold-blooded and tailed amphibian. II. Ichthyophis is a limbless amphibian and feeds underground on worms and insects. Which of the statement (s) given above is/are correct ?

(a) What type of circulatory system is there in cockroach ? (b) How many , chambered heart helps in the circulation of blood in cockroach's body ?