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Structural Organisation in Animals Test - 37

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Structural Organisation in Animals Test - 37
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  • Question 1
    1 / -0
    The longest cell in the body of an animal is
    Solution
    The longest cells in the human body are the neurons. Neurons are the cells of the nervous system. These cells are responsible to carry the impulse and responses. The axonic end of the neuron is present in the skin and extends into the CNS (brain and spinal cord).
    Therefore, the correct answer is option B.
  • Question 2
    1 / -0
    Tendons connect:
    Solution

    Tendons allow a bone to move. They are fibrous connective tissues that attach muscles to bones. 

    Hence, the correct option is B.

  • Question 3
    1 / -0
    The epithelium which forms the inner wall of blood vessels is_____________
    Solution
    • Endothelium is a term used to describe simple squamous epithelium that lines the blood vessels. 
    • The endothelium is the thin layer of cells that line the interior surface of blood vessels.
    • These endothelial cells lines the entire circulatory system, from the heart to the smallest capillary. 
    • Hence, the correct answer is option is C.
  • Question 4
    1 / -0
    Gizzard in an earthworm serves for
    Solution
    In the 8$$^{th}$$ segment, the oesophagus dilates and modifies into a large, muscular oval shaped gizzard occupying 8$$^{th}$$ and 9$$^{th}$$ segments. The gizzard is made of circular muscles and is internally lined by a cuticle. There are chitinous teeth. It acts as a grinder which crushes the food material. After the gizzard, the food is pushed to the intestine where it is finally broken down into simpler compounds.
    Thus, the correct answer is option D.
  • Question 5
    1 / -0
    Endothelium of the inner surface of blood vessels in vertebrates is
    Solution
    Simple squamous epithelium that lines the blood vessels is called the endothelium. It is the thin layer of cells lining the interior surface of blood vessels, forming an interface between circulating blood in the lumen and the rest of the vessel wall. Endothelial cells line the entire circulatory system, from the heart to the smallest capillary. These cells reduce turbulence of the flow of blood allowing the fluid to be pumped farther. 
    Hence the correct option is A.
  • Question 6
    1 / -0
    Nerve cells have many short branches called as___________
    Solution
    Dendrite is a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body. A neuron is an electrically excitable cell that processes and transmits information through electrical and chemical signals. These signals between neurons occur via synapses, specialized connections with other cells. An axon is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body. Myelinated axons are known as nerve fibers. The function of the axon is to transmit information to different neurons, muscles and glands. A neutrophil is a type of white blood cell, a type of granulocyte, and a type of phagocyte. 
    Therefore, the correct answer is option A.
  • Question 7
    1 / -0
    Which cell stops dividing after birth?
    Solution
    The nerve cells stop dividing after the birth of the child. There are no centrosomes in the neurons. Since there are no centrosomes the formation of the spindle apparatus cannot take place. The spindle fibres are necessary for the cell division to take place because they help in the attachment of the chromosomes
    So, the correct answer is 'Neuron'
  • Question 8
    1 / -0
    Tendon connects
    Solution
    Correct Answer: B
    Explanation:
    • Tendon comes under the white fibrous connective tissue(dense regular connective tissue).
    • In tendons, a large number of the collagen bundle are arranged in parallel series.
    • Tendons are thick thread-like inelastic strings or cords of high tensile strength. being elastic they prevent overstretching.
    • Tendons connect skeletal muscles to bones.
    • Hence, the correct answer is Bone with muscles.
  • Question 9
    1 / -0
    In cardiac muscles, certain structure allows the cells to contract as a unit and is known as
    Solution
    Intercalated discs are microscopic structures of cardiac muscle. They occur at the Z-line of the sarcomere and are made of fascia adherens, desmosomes and gap junctions. They are cross bands that separate the opposite ends of myocytes. These discs hold the adjacent cells together and allow diffusion of ions across the cells due to which muscle impulses travel rapidly from cell to cell leading to their contraction. Thus the correct answer is option D.

  • Question 10
    1 / -0
    The function of gizzard seen in grasshopper and cockroach digestive system is
    Solution

    The alimentary canal is a tubular structure, extending from the mouth to the anus present in the body cavity of grasshopper and cockroach. It is divided into three regions: foregut, midgut and hindgut.The mouth opens into a short tubular pharynx, leading to a narrow tubular passage called oesophagus. This, in turn, opens into a sac-like structure called crop used for storing food. The crop is followed by gizzard or proventriculus. Gizzard has an outer layer of thick circular muscles and thick inner cuticle forming six highly chitinous plate called teeth. Gizzard helps in grinding the food particles. Hence, the function of gizzard seen in the grasshopper and cockroach digestive system is the grinding of food materials.

    So, the correct option is 'grinding of digestive enzymes'. 

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