Plant diversity defines that plants are mostly photosynthetic organisms which found in water and land and these are multi-cellular. Biodiversity boosts ecosystem productivity where each species, no matter how small, all have an important role to play. For example, A larger number of plant species means a greater variety of crops. Greater species diversity ensures natural sustainability for all life forms.

Thorns are simple plant defense mechanisms to deter any animal or person from handling the plant. Some plants have thorns to protect themselves and some plants eat insects for nourishment

Birds with eyes on the sides of their heads have a wide visual field, useful for detecting predators, while those with eyes on the front of their heads, such as owls, have binocular vision and can estimate distances when hunting. Owls have terrific binocular vision compared to other birds. Binocular vision describes the ability of animals with two eyes to see an object with both eyes at the same time, giving an animal increased depth perception. Like all birds of prey, an owl's eyes face the front.

Functions of leaves:

a. The leaves make food for the plant.

b. The leaves get rid of excess water from the plant through transpiration.

c. The leaves carry out the process of respiration in plants.

A family consisting of a pair of adults and their children is called small family or nuclear family.
Joint family or big family is large in size consisting of members of 3 or more generation such as grandparents, parents, siblings, uncles, aunts and cousins living in one home.

A family consisting of a pair of adults and their children is called small family or nuclear family.

Animals need food to provide energy to existing cells and to provide the raw materials and energy for the construction of new cells. Cells in animal bodies combine oxygen with food to release energy. ... Cells in animal bodies combine oxygen with food to release energy. Organisms are related in food webs in which some animals eat plants for food and other animals eat the animals that eat plants. ... 1 All animals need food in order to live and grow. They obtain their food from plants or from other animals. Plants need water and light to live and grow.

Every living organism generates waste in its body and has a mechanism to expel it. In humans, waste generation and disposal are taken care of by the human excretory system.