Structural Organisation in Animals quiz

The epithelium lining the walls of blood vessels and air sacs of lungs is:

Goblet cells are examples of:

Adipose tissue stores:

Which junction helps cells communicate by connecting their cytoplasm?

Cardiac muscle is:

The heart of a frog has:

Frogs are:

The skin of the frog is used for respiration mainly when it is:

The membrane that protects the frog's eyes in water is the:

Fertilisation in frogs is:

What is the function of ciliated epithelium? (2 marks)

Distinguish between exocrine and endocrine glands. (2 marks)

What is compound epithelium? Where is it found? (2 marks)

What are the components of areolar tissue? (2 marks)

Why is blood called a connective tissue? (2 marks)

How can you distinguish a male frog from a female frog externally? (2 marks)

What is the role of the renal portal system in frogs? (2 marks)

What is the cloaca? (2 marks)

What is Bidder's canal? (2 marks)

How do frogs benefit humans? (2 marks)

A frog weighs 50 g, and its liver forms 4% of its body mass. Calculate the mass of the liver. (3 marks)

The skin of a frog accounts for 25% of its oxygen uptake on land and 100% in water. If its oxygen uptake on land is 0.8 mL per minute, calculate the uptake through the skin and through the lungs and buccal cavity. (3 marks)

A tadpole takes 12 weeks to metamorphose. If its tail shortens by 1.5 cm uniformly over the last 4 weeks, calculate the shortening per week. (3 marks)

A sample of loose connective tissue has 300 cells: 180 fibroblasts, 90 macrophages and 30 mast cells. Calculate the percentage of each. (3 marks)

Simple squamous cells are about 0.1 micrometre thick in lung air sacs. Calculate how many such layers would make a thickness of 1 micrometre. (3 marks)

Read the passage and answer the questions. A student examined a sample of tissue that had cells closely packed with little intercellular matrix, resting on a basement membrane. Some cells had hair-like projections on their free surfaces. (i) Identify the tissue. (ii) Name the projections and their function. (iii) Where is such tissue found? (5 marks)

Read the passage and answer the questions. Connective tissues are the most abundant and widely distributed in the body of complex animals. They link and support other tissues or organs of the body. They range from soft connective tissues to specialised types, which include cartilage, bone, adipose and blood. In all connective tissues except blood, the cells secrete fibres of structural proteins called collagen or elastin. (i) Why is blood called a fluid connective tissue? (ii) What is the matrix of bone made of? (iii) Name the cells of cartilage. (5 marks)

Read the passage and answer the questions. Frogs can change colour to hide themselves from enemies (camouflage). This protective colouration is called mimicry. Frogs are also not seen during peak summer and winter, as they take shelter in deep burrows to protect themselves from extreme heat and cold. (i) What are the terms for summer sleep and winter sleep? (ii) Why are frogs called poikilotherms? (iii) How does camouflage help frogs? (5 marks)

Read the passage and answer the questions. The frog has a well-developed muscular heart situated in the upper part of the body cavity. It has three chambers: two atria and one ventricle, and is covered by a membrane called the pericardium. A triangular structure called the sinus venosus joins the right atrium. It receives blood through the major veins called vena cava. (i) Name the sac into which the ventricle opens. (ii) What is the significance of the hepatic portal system? (iii) Why are the RBCs of frogs different from human RBCs? (5 marks)

Read the passage and answer the questions. Frogs have a well-organised nervous system with a brain, spinal cord and nerves. The brain is enclosed in a bony structure called the brain box (cranium). The brain is divided into forebrain, midbrain and hindbrain. Frogs have different types of sense organs, such as organs of touch, taste, smell, sight and hearing. (i) How many pairs of cranial nerves arise from the brain? (ii) Name the parts of the hindbrain. (iii) Which sense organs are well organised in frogs? (5 marks)

Describe the types of epithelial tissue with labelled diagrams and examples. (6 marks)

Describe the types of connective tissue with diagrams and their functions. (6 marks)

Compare the three types of muscle tissue and describe neural tissue with labelled diagrams. (6 marks)

Describe the external morphology of the frog and its digestive and respiratory systems. (6 marks)

Describe the circulatory, excretory and reproductive systems of the frog with labelled diagrams. (6 marks)