Home
Class 12
BIOLOGY
Some of the statements are given below ...

Some of the statements are given below
I. Porifera to Echinodermata lack a notochord.
II. Platyhelminthes display tissue level organisation.
III. Mesoglea is present in coelenterates during development.
IV. Aschelminthes are coelomates.
Choose the correct option for true statement.

A

I and II

B

II and III

C

I, III and IV

D

All of the above

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements are true, we will analyze each statement one by one: ### Step 1: Analyze Statement I **Statement I:** "Porifera to Echinodermata lack a notochord." - **Analysis:** The phyla Porifera (sponges) to Echinodermata (starfish, sea urchins) do not possess a notochord. The notochord is a characteristic feature of the phylum Chordata. Therefore, this statement is **true**. ### Step 2: Analyze Statement II **Statement II:** "Platyhelminthes display tissue level organisation." - **Analysis:** Platyhelminthes (flatworms) exhibit organ level organization, not merely tissue level organization. They have organs and systems, which means this statement is **false**. ### Step 3: Analyze Statement III **Statement III:** "Mesoglea is present in coelenterates during development." - **Analysis:** Coelenterates (Cnidarians) have mesoglea, a jelly-like substance, between their ectoderm and endoderm layers. This is indeed present during their development. Thus, this statement is **true**. ### Step 4: Analyze Statement IV **Statement IV:** "Aschelminthes are coelomates." - **Analysis:** Aschelminthes (now often referred to as pseudocoelomates) have a body cavity that is not entirely lined by mesoderm (pseudocoel), which means they are not true coelomates. Therefore, this statement is **false**. ### Conclusion Based on the analysis: - Statement I: True - Statement II: False - Statement III: True - Statement IV: False The correct option for true statements is **I and III**. ### Final Answer The correct option is **Option 3: I, III, and IV are true, while II is false**. ---
Promotional Banner

Topper's Solved these Questions

  • HEREDITY AND EVOLUTION

    ARIHANT PUBLICATION|Exercise QUESTION BANK|85 Videos

Similar Questions

Explore conceptually related problems

The proteins present in myofilaments are I. gloulin II. Actin III. Haemoglobin IV. Tropomyosin Choose correct option with correct statements (s).

The radial symmetry is observed in Platyhelminthes II. Coelenterates IIIgt Aschelminthes IV. Annelids v) Echinoderms The correct statements are

Which of the following statements are true? I. Molluscs possess cellular level of organisation. II. Arthropods are true coelomates. III. Platyhelminthes are pseudocoelomates. IV. Ctenophores have bilateral symmetry. Choose the correct option.

Prophase of meiosis includes I. Leptotene II. Pachytene III. Cytokinesis IV. Kayokinesis Choose the option with correct statement(s).

Adipose tissue is found in I. hmnp of camel. II. fibrous capsules of penis. III. yellow bone marrow. IV. Vitreous body of eyeballs. Choose the option with the correct statements.

Consider the following four compounds I, II, III, and IV. Choose the correct statement(s).

Match the items of Column I with the items of Column II and Column III and choose the correct option from the codes given below.