Diversity in Living Organisms

Spirulina is a cyanobacterium (blue-green algae) that contains 60-70% protein by dry weight, making it one of the richest natural sources of protein. While Chlorella is also protein-rich, Spirulina has higher protein content and is commonly used as a protein supplement.

Yes, it is the correct answer. Anaebana is not a free living cyanobacteria. Anabaena Azollae maintains a mutually beneficial symbiotic relationship.

Mammary glands are the defining characteristic of all mammals, giving the class its name. While some mammals like whales have lost hair (option B) and there are other exceptions to features like the diaphragm or teeth, mammary glands are universal in mammals.

Eucheuma  is a group of red seaweeds representing the tribe Eucheumatoideae used in the production of carrageenan, an important product used in cosmetics, food processing, and industrial uses, as well as a food source for those living in Indonesia and the Philippines.

All green algae have mitochondria with flat cristae. When present, paired flagella are used to move the cell. They are anchored by a cross-shaped system of microtubules and fibrous strands.

Myrmecia is a genus of green algae that is associated with lichens.

Gyromitrin is a toxin and carcinogen present in several members of the fungal genus Gyromitra, most notably the false morel G. esculenta. It is unstable and is easily hydrolyzed to the toxic compound monomethylhydrazine, a component of some rocket fuels.

In hydra, new individuals develop from buds.

This is the correct answer. Option a and c are correct.

This is the correct answer. Plants and animals both excrete their waste materials. Plants excrete latex and gum. Animals excrete undigested food.

This is the correct answer. Balloon is a non-living thing which grows in size and shows movement when it is pushed.

Frogs use their moist, highly vascularized skin as an accessory respiratory organ for gas exchange (cutaneous respiration), supplementing their lungs. Humans, rabbits, and lizards do not have skin adapted for significant respiratory function - their skin is primarily protective.

Myxococcus uses fimbriae for motility. It facilitates the assembly of multicellular structures.

Protozoa are single-celled eukaryotic organisms that belong to the kingdom Protista. They are not multicellular, not prokaryotic (bacteria), and are ecologically and medically important as pathogens, parasites, and decomposers. 'Unimportant' is factually incorrect.

The two types of calyx based on sepals fusion are: gamosepalous (fused sepals, as in china rose) and polysepalous (free sepals, as in mustard). Persistent is a type based on duration, not fusion. Petalloid and sepalloid describe perianth, not calyx types.