Internal Structure of Plants and Animals

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1. A student observes a transverse section of a dicotyledonous stem under a microscope. Which of the following features best distinguishes this section from that of a dicotyledonous root?

   1. A The vascular bundles are arranged in a ring around a central pith
   2. B The xylem and phloem are arranged in an alternating radial pattern
   3. C The epidermis is covered by a thick layer of cork immediately
   4. D The vascular tissue is located only in the centre of the tissue

2. Which of the following statements correctly describes the distribution of mechanical tissues in a young dicotyledonous stem?

   1. A Sclerenchyma is located just beneath the epidermis, while collenchyma is found within the vascular bundles
   2. B Both collenchyma and sclerenchyma are located exclusively in the pith
   3. C Collenchyma is found in the xylem, while sclerenchyma is found in the phloem
   4. D Collenchyma is located just beneath the epidermis, while sclerenchyma is found within the vascular bundles

3. In a transverse section of a monocotyledonous leaf, the vascular bundles are scattered. Which of the following features is characteristic of the xylem in these bundles?

   1. A It is arranged in a star shape with phloem between the arms
   2. B It is located in a central ring with phloem inside the ring
   3. C It is scattered randomly without any specific shape relative to the phloem
   4. D It is arranged in a V-shape or U-shape with phloem on the outer side

4. A student observes a transverse section of a young dicotyledonous stem under a microscope. She notes a layer of cells with unevenly thickened primary walls located just beneath the epidermis. Which tissue is she observing, and what is its primary function?

   1. A Collenchyma; flexible support for growing tissues
   2. B Sclerenchyma; rigid support for mature tissues
   3. C Xylem; transport of water and minerals
   4. D Phloem; transport of organic nutrients

5. In a transverse section of a monocotyledonous root, the vascular tissue is arranged in a specific pattern. Which of the following correctly describes the distribution of xylem and phloem in this structure?

   1. A Tetrarch xylem in the centre with phloem in the four spaces between the xylem arms
   2. B Polyarch xylem in the centre with phloem in the spaces between the xylem arms
   3. C Phloem in the centre surrounded by a ring of xylem
   4. D Xylem and phloem arranged in scattered bundles throughout the pith

6. A botanist is comparing the supporting tissues in the leaf petiole of a mature plant versus a young, actively growing stem. Which statement correctly distinguishes the predominant supporting tissue in these two regions?

   1. A Sclerenchyma predominates in the young stem, while collenchyma predominates in the mature petiole
   2. B Collenchyma predominates in the young stem, while sclerenchyma predominates in the mature petiole
   3. C Both tissues are predominantly composed of xylem fibres
   4. D Both tissues are predominantly composed of phloem fibres

8. In a transverse section of a dicotyledonous stem, which tissue is primarily responsible for the mechanical support of the young, growing organ and is characterised by living cells with unevenly thickened primary walls?

   1. A Sclerenchyma
   2. B Xylem
   3. C Phloem
   4. D Collenchyma

9. When examining the internal anatomy of a mammal, the liver is located in the abdominal cavity. Which of the following statements correctly describes its primary physiological role in relation to the digestive system?

   1. A Production of bile for fat emulsification
   2. B Production of insulin for blood sugar regulation
   3. C Storage of oxygen for cellular respiration
   4. D Filtration of blood to form urine

10. In a transverse section of a monocotyledonous root, the vascular tissue is arranged in a specific pattern. How does this arrangement differ from that of a dicotyledonous root, and what is the functional significance of this difference?

    1. A Monocots have a central pith with no vascular tissue, while dicots have a solid xylem core.
    2. B Monocots have xylem and phloem in alternating bundles around a central pith, whereas dicots have a central star-shaped xylem with phloem between the arms.
    3. C Monocots have phloem in the centre with xylem around it, while dicots have xylem in the centre with phloem around it.
    4. D Monocots have vascular tissue only in the cortex, while dicots have it in the pith.

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