Explanation:

Introduction:
The true statement regarding frog (Rana tigrina) is option 'C', which states that poisonous glands are not found on the body of frog. In this response, we will explain why this statement is true and provide some additional information about frogs.

Poisonous Glands:
Frogs belong to a group of amphibians called Anura, which means "tail-less" in Greek. While not all frogs are poisonous, many species of frogs possess toxic or poisonous glands on their bodies. These glands, known as parotoid glands, are located behind the eyes, on the sides of the head, and sometimes on the back of the body. They secrete toxic substances that serve as a defense mechanism against predators.

Defensive Adaptations:
The toxic substances produced by the parotoid glands vary among different frog species. Some frogs produce alkaloids, which can cause irritation or even death in predators. Others produce toxins that make them taste bad or cause paralysis. These adaptations help frogs survive in their natural habitats and deter predators from consuming them.

Rana tigrina:
Rana tigrina, commonly known as the Indian bullfrog, is a species of frog found in South Asia. It is one of the largest species of frogs, with males reaching a length of up to 15 centimeters. While Rana tigrina does not possess poisonous glands on its body, it does have other interesting adaptations.

Adaptations of Rana tigrina:
1. Camouflage: Rana tigrina has a mottled green or brown coloration, which helps it blend in with its surroundings, such as vegetation or water bodies. This camouflage helps it avoid detection by predators and increases its chances of survival.

2. Powerful Hind Legs: Rana tigrina has long and muscular hind legs, which are adapted for jumping and swimming. These legs enable the frog to leap long distances and escape from potential threats.

3. Moist Skin: Frogs, including Rana tigrina, have moist skin that helps them breathe through a process called cutaneous respiration. This adaptation allows them to extract oxygen directly from the environment, even when submerged in water.

4. Vocalizations: Male Rana tigrina produce loud and distinctive calls during the breeding season to attract females. These calls serve as a means of communication and help in the mating process.

Conclusion:
In conclusion, the true statement regarding Rana tigrina is that poisonous glands are not found on the body of this frog species. However, it is important to note that while Rana tigrina itself may not possess poisonous glands, there are many other frog species that do. Frogs have a wide range of adaptations that help them survive in their respective habitats, including camouflage, powerful hind legs, moist skin, and vocalizations.

C