Diversity in Living Organisms

 Birds lack teeth and the beak performs grinding of food into smaller particles.

Reason: Multicellular - made up of many cells Fish, Cockroach and pea plant - are examples of animals, insects and plants which are multicellular.Paramecium - is an example of protozoans which are a type of Protist (unicellular eukaryotic organism). Therefore, Paramecium is a unicellular organism as it is made up only one cell.   

Nucleus has a double layered covering called nuclear membrane. It is composed of DNA and protein. DNA molecules (Deoxyribonucleic acid) contain the information necessary for constructing and organising cells. Eukaryotes is the correct answer. Organisms with cells having a nuclear membrane are called eukaryotes, e.g. plants, animals.

Cell membrane of a eukaryotic cell bears respiratory enzymes. Respiratory enzymes is an enzyme, such as oxidases, that transfer electrons from its substrate to molecular oxygen. During cellular respiration, cell membrane bears respiratory enzyme in prokaryotic cells but in eukaryotes cell, membrane lacks respiratory enzyme. In case of eukaryotic cell, respiratory enzymes are present in mitochondrial membrane. 

Amoeba has no definite shape or size because it uses amoeboid movement, as a form of locomotion. They can create extensions of their body wall called pseudopodia (false feet) that helps them to locomote or capture prey. 

Reason: Bacterium belong to the kingdom Monera which are composed of unicellular organisms. Fungus: They are multicellular organisms belonging to kingdom animalia. Plants & Animals: They are multicellular eukaryotes. 

The microtubular arrangement in the flagellar filament is 9+2

Paramecium is surrounded by numerous minute cilia on the body which help in movement.

Hydra somersaults like an acrobat with the help of tentacles.

Leech and earthworm perform crawling or looping movement with the help of contraction and relaxation of circular and longitudinal muscles.

Euglena moves with the help of flagella, i.e. it shows flagellar movement.

Starfish have tube feet as the locomotory organ.

Cilia are short, fine, vibratile hair-like processes present on the free surface of cells. They create a current in water by means of their oar-like activity and help in movement of cells.

It is a heterotypic bone formed in the eyelids of crocodile.

Photosynthesis is a process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. Photosynthesis occurs in plants, algae, and sulphur bacteria, but not in archaea. Photosynthetic organisms are called autotrophs, since they can create their own food.