Answer: Option C. -> Transpiration
:
C
$\bullet$ Transpiration is the process by which plants lose water in the form of water vapour through pores called stomata on their leaves.
$\bullet$ Cellular respiration occurs in all living organisms to obtain energy.
$\bullet$ Excretion is the process by which waste products are removed out from the organisms.
$\bullet$ Digestion of food is a process that takes place in higher organisms like insects, birds and mammals.

Answer: Option A. -> gills  
:
A

Land animals, such as lions, have lungs to take in oxygen from the air. Fishes, on the other hand, cannot breathe in oxygen directly from the atmosphere. So they have specialised organs called gills to help them breathe in the oxygen dissolved in water.

Answer: Option B. -> stimulus
:
B

Any change in the surroundings that causes the organisms to respond to them is known as a 'stimulus'. In this case, the insect is sitting on the open mouth of the pitcher plant, so touch is an stimulus here. It evokes the flap of the pitcher plant to shut, which is the response of the plant. 

Answer: Option B. -> False
:
B
The environment where an organism lives is called its habitat. The organisms depend on their habitats for food, water, shelter and other needs. All organisms do not live in the same habitat.
According to their habitat, animals are divided mainly into the following groups:
$\bullet$ Terrestrial animals are those which live entirely on land. E.g., horse, lion, etc.
$\bullet$ Aquatic animals are creatures that live in water. E.g., fishes, whales, etc.
$\bullet$ Amphibious animals, like frog, salamander and toad, live on both land and water.

Answer: Option D. -> All living things
:
D
Any thing that is classified as a living being is reffered to as an organism. This includes plants, animals, birds, insects, etc.

Answer: Option B. -> Lizard
:
B

Blue whales, rats and human beings are mammals. All mammals give birth to young ones, except platypus and echidna as they are egg-laying mammals. Lizards, on the other hand, are oviparous i.e., they lay eggs and they don't give birth to young ones.

Answer: Option C. -> Rock
:
C
  $\bullet$ The living things in a habitat are its biotic components whereas non living things in a habitat are its abiotic components.
  $\bullet$ Rock, air, water and sunlight are the abiotic components in a habitat. All the plants and animals are the biotic components in a terrestrial habitats and fish is the biotic component in aquatic habitat.

Answer: Option B. -> excretion
:
B
  $\bullet$ The process by which the living organism get rid of their waste is called excretion.
  $\bullet$ Digestion is the process during which food is broken down into nutrients.
  $\bullet$ Circulation is the process where the nutrients and oxygen are carried to all the cells by the blood. 
  $\bullet$ Respiration is the process in which nutrients are broken down with the help of oxygen in the cells. 

Answer: Option A. -> habitat
:
A
The environment in which an organism lives is called its habitat. The organisms depend on their habitat for their food, water, air, shelter and other needs. Habitat is the dwelling place of the animal or a plant. Several kinds of plants and animals may share the same habitat. 

Answer: Option D. -> Pond
:
D
  $\bullet$ Aquatic habitat is an ecosystem present in a body of water. Ponds, oceans, seas and rivers are examples of aquatic habitats. 
  $\bullet$ Terrestrial habitats are ones that are found on land, such as forests, grasslands and deserts.