Explanation

Explanation

Euglena is a unicellular organism, a key characteristic of many Protista.

Although it is eukaryotic and lives in water, being unicellular is the main reason it’s classified under Protista.

Explanation

A species is defined as a group of organisms that can mate and produce fertile offspring.

Organisms in different genera generally cannot produce fertile offspring.

Explanation

Pheretima posthuma is the common species of earthworm found in South Asia.

It belongs to the phylum Annelida.

It is important for soil fertility.

Explanation

In 1969, Whittaker proposed a system of classification that divided all living organisms into five kingdoms:

1. Monera (bacteria and cyanobacteria)
2. Protista (protozoa, algae, and slime molds)
3. Fungi (mushrooms, molds, and yeasts)
4. Plantae (plants)
5. Animalia (animals)

Explanation

After cytokinesis, daughter cells enter interphase, the phase where they grow to normal size and prepare for the next division.

Interphase includes G1 (growth), S (DNA replication), and G2 (preparation for mitosis) stages.

Explanation

Fossil fuels (like coal, oil, and natural gas) are non-renewable because they take millions of years to form.

Once used, they cannot be replenished on a human timescale.

Explanation

Pathogenic bacteria are harmful microorganisms that cause diseases in humans, animals, or plants.

Examples include E. coli, Salmonella, and Streptococcus.

Explanation

The P generation refers to the parental generation in a genetic cross.

These individuals are considered "pure-breeding," meaning they have homozygous genotypes for a particular trait, and therefore exhibit that trait without any variation. 

Explanation

A nucleoside is composed of a Base + Sugar. 

A nucleoside is a molecule made up of a nitrogenous base (like adenine, guanine, cytosine, or thymine) 

Attached to a five-carbon sugar (ribose or deoxyribose).

It lacks the phosphate group that is found in a nucleotide.