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Structural Organisation in Animals

Structural Organisation in Animals

Action PlanNotesQuestionsMock-Test
Study Action Plan (Sorted by Difficulty)
Circulatory System of Frogs
Accuracy: 63%
Total Attempted46
Total Correct29
Total Incorrect17
Difficulty Level:
Medium
Digestive System of Frogs
Accuracy: 67%
Total Attempted55
Total Correct37
Total Incorrect18
Difficulty Level:
Medium
Diagram-Based Identification of Frog Organ Systems
Accuracy: 72%
Total Attempted25
Total Correct18
Total Incorrect7
Difficulty Level:
Medium
Frog Habitat and Adaptive Features
Accuracy: 72%
Total Attempted47
Total Correct34
Total Incorrect13
Difficulty Level:
Medium
External Morphology and Sexual Dimorphism in Frog
Accuracy: 73%
Total Attempted44
Total Correct32
Total Incorrect12
Difficulty Level:
Medium
Neural and Endocrine Systems in Frogs
Accuracy: 76%
Total Attempted66
Total Correct50
Total Incorrect16
Difficulty Level:
Low
Respiratory Mechanisms in Frogs
Accuracy: 81%
Total Attempted99
Total Correct80
Total Incorrect19
Difficulty Level:
Low
Reproductive System of Frogs
Accuracy: 81%
Total Attempted58
Total Correct47
Total Incorrect11
Difficulty Level:
Low
Morphology and Anatomy of Frogs
Accuracy: 81%
Total Attempted85
Total Correct69
Total Incorrect16
Difficulty Level:
Low
Excretory System of Frogs
Accuracy: 82%
Total Attempted66
Total Correct54
Total Incorrect12
Difficulty Level:
Low
Ecological Role of Frogs
Accuracy: 82%
Total Attempted61
Total Correct50
Total Incorrect11
Difficulty Level:
Low
Frog Sense Organs
Accuracy: 83%
Total Attempted6
Total Correct5
Total Incorrect1
Difficulty Level:
Low
Tissue and Organ Systems
Accuracy: 87%
Total Attempted76
Total Correct66
Total Incorrect10
Difficulty Level:
Low

Learning Objectives

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Learning Objectives

  • Understand the concept of organ and organ systems in multicellular organisms.
  • Identify the four basic types of tissues in complex animals.
  • Describe the morphology and anatomy of frogs as representatives of vertebrates.
  • Explain the physiological adaptations of frogs for living in both aquatic and terrestrial environments.
  • Analyze the structure and function of the digestive, circulatory, respiratory, nervous, excretory, and reproductive systems in frogs.
  • Recognize the significance of frogs in ecological balance and their role in the food chain.

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Revision Notes & Summary

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Structural Organisation in Animals

7.1 Organ and Organ System

  • Definition of Tissue: A group of similar cells along with intercellular substances performing a specific function.
  • Types of Tissues: Four basic types of tissues in complex animals.
  • Organ Formation: Organs are formed by the organization of tissues.
  • Organ Systems: Two or more organs working together form an organ system (e.g., digestive system).

7.2 Frogs

  • Class: Amphibia, Phylum Chordata.
  • Common Species: Rana tigrina.
  • Body Temperature: Cold-blooded (poikilotherms).
  • Camouflage: Ability to change color for protection.
  • Hibernation and Aestivation: Summer sleep (aestivation) and winter sleep (hibernation).

7.2.1 Morphology

  • Skin: Smooth, slippery, and moist due to mucus.
  • Body Structure: Divided into head and trunk; no neck or tail.
  • Eyes: Bulged, covered by a nictitating membrane.
  • Limbs: Forelimbs and hind limbs assist in movement.

7.2.2 Anatomy

  • Digestive System: Short alimentary canal; includes mouth, oesophagus, stomach, intestine, rectum, and cloaca.
  • Respiratory System: Skin (cutaneous respiration) and lungs (pulmonary respiration).
  • Circulatory System: Closed system with a three-chambered heart.
  • Excretory System: Composed of kidneys, ureters, cloaca, and urinary bladder.
  • Reproductive System: Male (testes) and female (ovaries) reproductive organs; external fertilization.

Important Diagrams

Figure 7.1: External Features of Frog

  • Head: Front part of the frog.
  • Eye: Located near the top of the head.
  • Trunk: Main body section.
  • Fore limb: Front leg.
  • Hind limb: Rear leg.

Figure 7.2: Internal Organs of Frog

  • Heart: Central top, red.
  • Oesophagus: Behind the liver.
  • Liver: Large, brown, lobed.
  • Gall bladder: Green, under the liver.
  • Lung: Small, pink, beside the liver.
  • Stomach: Pink, elongated, on the right side.
  • Kidney: Red, elongated, centrally located.
  • Cloaca: Posterior end for waste exit.

Figure 7.3: Male Reproductive System

  • Testis: Yellowish ovoid structures.
  • Vasa efferentia: Connect testes to kidneys.
  • Cloaca: Chamber for excretory and reproductive tracts.

Figure 7.4: Female Reproductive System

  • Ovary: Produces ova.
  • Oviduct: Transports ova to cloaca.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

Nucleated erythrocytes

B.

Non-nucleated erythrocytes

C.

Chloroplasts

D.

None of the above
Correct Answer: A

Solution:

Frog's blood contains nucleated erythrocytes (RBCs).

Chapter Concept:

Circulatory System of Frogs

A.

Liver

B.

Kidneys

C.

Lungs

D.

Heart
Correct Answer: B

Solution:

The kidneys in frogs are the primary organs responsible for the excretion of nitrogenous wastes. They are described as compact, dark red, and bean-like structures.

Chapter Concept:

Excretory System of Frogs

A.

Camouflage

B.

Hibernation

C.

Aestivation

D.

Mimicry
Correct Answer: B

Solution:

During winter, frogs undergo hibernation, which is a state of dormancy to survive cold temperatures.

Chapter Concept:

Frog Habitat and Adaptive Features

A.

Nictitating membrane

B.

Tympanum

C.

Nasal epithelium

D.

Vocal sacs
Correct Answer: B

Solution:

The tympanum, located on either side of the eyes, is responsible for receiving sound signals in frogs.

Chapter Concept:

Frog Sense Organs

A.

They are primary producers.

B.

They are decomposers.

C.

They serve as an important link in the food chain and food web.

D.

They are top predators.
Correct Answer: C

Solution:

Frogs maintain ecological balance by serving as an important link in the food chain and food web.

Chapter Concept:

Ecological Role of Frogs

A.

The kidneys are located anteriorly in the body cavity.

B.

The urinary bladder opens directly to the exterior.

C.

The cloaca serves as a common passage for urine, feces, and reproductive cells.

D.

Frogs excrete nitrogenous waste in the form of uric acid.
Correct Answer: C

Solution:

The cloaca in frogs serves as a common chamber for the passage of urine, feces, and reproductive cells to the exterior.

Chapter Concept:

Excretory System of Frogs

A.

During active swimming

B.

During aestivation and hibernation

C.

While feeding on land

D.

During vocalization
Correct Answer: B

Solution:

Cutaneous respiration is the primary mode of gas exchange during aestivation and hibernation when frogs are inactive and rely on their moist skin.

Chapter Concept:

Respiratory Mechanisms in Frogs

A.

To store urine

B.

To absorb nutrients

C.

To serve as a common passage for urine, feces, and reproductive cells

D.

To secrete digestive enzymes
Correct Answer: C

Solution:

The cloaca in frogs is a common chamber into which the intestinal, urinary, and reproductive tracts open, allowing for the passage of urine, feces, and reproductive cells.

Chapter Concept:

Neural and Endocrine Systems in Frogs

A.

Male frogs have vocal sacs and copulatory pads.

B.

Female frogs have vocal sacs and copulatory pads.

C.

Male frogs have a longer digestive tract.

D.

Female frogs have a larger heart.
Correct Answer: A

Solution:

Male frogs can be distinguished by the presence of sound-producing vocal sacs and a copulatory pad on the first digit of the forelimbs, which are absent in female frogs.

Chapter Concept:

Reproductive System of Frogs

A.

Presence of vocal sacs

B.

Presence of nictitating membrane

C.

Webbed digits

D.

Olive green dorsal skin
Correct Answer: A

Solution:

Male frogs can be distinguished by the presence of sound-producing vocal sacs and a copulatory pad on the first digit of the forelimbs, which are absent in female frogs.

Chapter Concept:

External Morphology and Sexual Dimorphism in Frog

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Structural Organisation in Animals

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True or False

Correct Answer: True

Solution:

Frogs are essential for ecological balance as they are a key component of food chains and food webs, helping to control insect populations and providing food for other animals.

Chapter Concept :

Ecological Role of Frogs

Correct Answer: True

Solution:

Frogs can respire in water through their skin, a process known as cutaneous respiration, where dissolved oxygen in the water is exchanged through the skin by diffusion.

Chapter Concept :

Morphology and Anatomy of Frogs

Correct Answer: True

Solution:

In male frogs, the ureters act as urinogenital ducts, which means they carry both urine and sperm to the cloaca. In female frogs, the ureters and oviducts open separately into the cloaca.

Chapter Concept :

Diagram-Based Identification of Frog Organ Systems

Correct Answer: True

Solution:

Frogs have a well-developed excretory system that includes kidneys, ureters, cloaca, and urinary bladder. They are ureotelic animals, meaning they excrete nitrogenous waste primarily as urea.

Chapter Concept :

Excretory System of Frogs

Correct Answer: True

Solution:

Frogs are carnivorous, which results in a shorter alimentary canal as they do not require extensive digestion of plant material.

Chapter Concept :

Digestive System of Frogs

Correct Answer: True

Solution:

Frogs use their skin as an aquatic respiratory organ (cutaneous respiration) to exchange dissolved oxygen in water through diffusion.

Chapter Concept :

Morphology and Anatomy of Frogs

Correct Answer: True

Solution:

Frogs are classified as poikilotherms because they do not maintain a constant body temperature; instead, their body temperature changes with the ambient environment.

Chapter Concept :

Frog Habitat and Adaptive Features

Correct Answer: False

Solution:

The liver secretes bile, but it is stored in the gall bladder, not the liver. Bile is essential for emulsifying fats during digestion.

Chapter Concept :

Digestive System of Frogs

Correct Answer: True

Solution:

Frog blood contains plasma and cells, and their red blood cells (RBCs) are nucleated, which is typical for amphibians.

Chapter Concept :

Circulatory System of Frogs

Correct Answer: False

Solution:

In multicellular organisms, a tissue is composed of a group of similar cells along with intercellular substances that perform a specific function.

Chapter Concept :

Tissue and Organ Systems

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