Both Annelida (e.g., earthworms) and Arthropoda (e.g., insects, crustaceans) exhibit metameric or segmented body plans, where the body is divided into distinct segments or repeating units along the length of the organism. This segmentation allows for greater flexibility and specialization of body parts.
So, the correct option is (C): Annelida and Arthropoda.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): All vertebrates are chordates but all chordates are not vertebrates
Reason (R): Notochord is replaced by the vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below:
| Class | Character | Example |
|---|---|---|
| 1) Xiphosura | Poisonous Claws | Limulus |
| 2) Arachnida | Coxal Glands | Scutigera |
| 3) Crustacea | Biramous appendage | Sarcoptes |
| 4) Diplopoda | Gnathochilarium | Spirostreptus |
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
The output (Y) of the given logic implementation is similar to the output of an/a …………. gate.
What is Microalbuminuria ?

In the above represented plasmid an alien piece of DNA is inserted at the EcoRI site. Which of the following strategies will be chosen to select the recombinant colonies?
The term ‘biodiversity’ is derived from the two words- ‘bios' which means life and ‘diversity’ i.e, differentiation or variation. Edward Wilson, the sociobiologist was the first to popularise the term ‘biodiversity’ in the year 1992. The term implies the occurrence of various plants and animals along with their variants such as biotypes, ecotypes and genes on earth. In our biosphere, the immense diversity or heterogeneity remains not only at the species level but also, at every level of biological organization that ranges from macromolecules in the cells to biomes.
Biodiversity and Conservation is a topic covered under the fifteenth chapter and Unit 5 of NCERT class 12 biology.