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ICAR JRF Plant Form and Physiology — practice questions — page 2

Explore 93 free Plant Form and Physiology questions in ICAR JRF Plant Sciences. Open each question or exercise to read its content, reference answers and available explanation.

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Plant Form and Physiology questions and exercises with answers

Showing questions 31–60 of 93.

The cork cambium produces cork cells containing which water repelling substance?Read the answer and worked solution →The periderm of a woody stem is made up of which three components?Read the answer and worked solution →What is the function of lenticels on a mature woody stem?Read the answer and worked solution →Besides the age of a tree, what else can an examination of its annual rings reveal?Read the answer and worked solution →A modified stem that grows horizontally underground and bears nodes and internodes is called what?Read the answer and worked solution →The eyes of a potato are best described as what?Read the answer and worked solution →Which pair correctly matches an aerial stem modification with its role?Read the answer and worked solution →Which set names the three major functions of the roots of seed plants?Read the answer and worked solution →Which root system type is found in monocots such as wheat, rice and corn?Read the answer and worked solution →Which structure protects the tip of a growing root and is continuously replaced?Read the answer and worked solution →Roughly how much of the root length do the zones of division, elongation and maturation occupy?Read the answer and worked solution →The zone of cell maturation in a root begins at which landmark?Read the answer and worked solution →How do root hairs contribute to the working of a root?Read the answer and worked solution →How does the ground tissue of a root compare with that of a stem?Read the answer and worked solution →What does the Casparian strip force water and dissolved solutes to do?Read the answer and worked solution →Lateral roots arise from which layer of the root?Read the answer and worked solution →How is the vascular tissue arranged in a monocot root compared with a dicot root?Read the answer and worked solution →Which description fits an adventitious root?Read the answer and worked solution →The roots of orchids that allow the plant to grow on another plant develop what?Read the answer and worked solution →A leaf attached directly to the stem without any stalk is described as what?Read the answer and worked solution →Which venation pattern is typical of dicot leaves?Read the answer and worked solution →Three or more leaves connected at a single node is which arrangement?Read the answer and worked solution →In which leaf type do leaflets radiate outwards from a single point like fingers from a palm?Read the answer and worked solution →Botanists call the lower side of a leaf by which name?Read the answer and worked solution →Which waxy layer covering the leaves of all plant species reduces the rate of water loss?Read the answer and worked solution →Which of these is a stated function of leaf trichomes?Read the answer and worked solution →Which mesophyll layer is built from column shaped, tightly packed cells?Read the answer and worked solution →Which epidermal cells are the only ones to contain chloroplasts?Read the answer and worked solution →What is true of every vascular bundle in a leaf, however large or small?Read the answer and worked solution →Two features of conifer needles that reduce water loss in cold environments are which?Read the answer and worked solution →

Worked practice questions

The cork cambium produces cork cells containing which water repelling substance?

  1. Lignin
  2. Cutin
  3. Suberin
  4. Pectin
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Correct answer: C. Suberin

1. In woody plants the cork cambium is the outermost lateral meristem. 2. It produces the cork cells of bark, and those cells contain a waxy substance called suberin that repels water. 3. Bark then protects the plant from physical damage and helps reduce water loss. 4. Lignin is the compound that hardens secondary xylem and sclerenchyma walls, so it is the trap for a reader thinking of wood. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.2 Stems_

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The periderm of a woody stem is made up of which three components?

  1. Cork cambium, cork cells and phelloderm
  2. Cork cambium, epidermis and phelloderm
  3. Vascular cambium, cork cells and cortex
  4. Vascular cambium, epidermis and pith
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Correct answer: A. Cork cambium, cork cells and phelloderm

1. The cork cambium produces cork cells outwards and a layer called phelloderm inwards. 2. Those three together, the cork cambium, the cork cells and the phelloderm, are the periderm. 3. The periderm substitutes for the epidermis in mature plants, so the epidermis is not one of its parts. 4. The vascular cambium belongs to the inner secondary tissues and is not counted in the periderm. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.2 Stems_

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What is the function of lenticels on a mature woody stem?

  1. They allow excess sugars to be released
  2. They allow lateral roots to break outwards
  3. They allow water droplets to be secreted
  4. They allow interior cells to exchange gases
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Correct answer: D. They allow interior cells to exchange gases

1. In some plants the periderm carries many openings called lenticels. 2. These openings let the interior cells exchange gases with the outside atmosphere. 3. That supplies oxygen to the living and metabolically active cells of the cortex, xylem and phloem. 4. Lateral roots instead arise from the pericycle inside the root, so the third option belongs to a different organ. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.2 Stems_

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