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Anatomy of Flowering Plants Test - 11

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Anatomy of Flowering Plants Test - 11
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  • Question 1
    1 / -0
    Ground tissue consists of
    Solution
    Ground tissue includes all tissues except epidermis and vascular bundles. The ground tissue comprises the bulk of the primary plant body. Parenchyma, collenchyma and sclerenchyma cells are common in the ground tissue.
    So, the correct answer is 'All tissues except epidermis and vascular bundles.'
  • Question 2
    1 / -0
    Centripetal xylem is present in
    Solution
    In dicotyledonous roots Xylem plates usually join at the centre forming a solid core. Hence the stele is regarded as a protostele. Xylem is always exarch, due to centripetal mode of diff­erentiation from the procambium, so protoxylem occurs towards circumference and metaxylem towards the center. 
    So, the correct answer is 'Dicot root.'
  • Question 3
    1 / -0
    Bicollateral bundles occur in stem of
    Solution
    The most common arrangement of the primary xylem and phloem is called a collateral bundle; the outer portion of the procambium (adjacent to the cortex) becomes phloem, and the inner portion (adjacent to the pith) becomes xylem. In a bicollateral bundle, the phloem is both outside and inside the xylem, as in Solanaceae (the potato family) and Cucurbitaceae (the cucumber family). Bicollateral vascular bundles are present in Cucurbitaceae family, examples Pumpkin, Ridge gourd. 
    So, the correct answer is 'Pumpkin.'
  • Question 4
    1 / -0
    Open vascular bundles are those which
    Solution
    In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues, and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them.
    So, the correct answer is 'Are capable of producing secondary xylem and phloem.'
  • Question 5
    1 / -0
    Closed vascular bundles lack
    Solution
    Vascular bundles, because of the presence of cambium, posses the ability to form secondary xylem and phloem tissues and hence, are called open vascular bundles. On the contrary, vascular bundles in monocots have no cambium. Hence, they do not form secondary tissues, and are referred to as closed.
    So, the correct answer is 'Cambium.'
  • Question 6
    1 / -0
    Given below are assertion and reason. Point out if both are true with reason bring correct explanation (A), both true but reason is not correct explanation (B), assertion true but reason is wrong (C), both are wrong (D).
    Assertion. In collateral vascular bundles, phloem is situated towards inner side.
    Reason. In monocot stem, cambium is present
    Solution
    The common arrangement of vascular tissues is collateral, i.e. the primary xylem is located on the inner side of the bundle, and the primary phloem is located on the outer side of the bundle. Monocot stems, such as corn, palms and bamboos, do not have a vascular cambium and do not exhibit secondary growth by the production of concentric annual rings. 
    So, the correct answer is 'D.'
  • Question 7
    1 / -0
    Oil cavities of Citrus are
    Solution
    Lysigenous intercellular spaces: These cavities of intercellular spaces store up water, gases and essential oils in them. The examples are commonly found in water plants and many monocotyledonous plants. The secretory cavities in Eucalyptus, Citrus and Gossypium are good examples.
    So, the correct answer is 'Lysigenous.'
  • Question 8
    1 / -0
    A bicollateral vascular bundle is characterised by
    Solution
    The large xylem vessels in the center are sandwiched between two layers of phloem (bicollateral bundle) that can be identified as groups of smaller cells above and below the xylem. Typical pairs of sieve tubes and smaller companion cells are found only in these parts of the vascular bundle. 
    So, the correct answer is 'Xylem being sandwitched between phloem.'

  • Question 9
    1 / -0
    The correct sequences of reproductive stages is the following in plants is 
    Solution
    • Gametes a mature haploid male or female germ cell which is able to unite with another of the opposite sex in sexual reproduction to form a zygote. 
    • The zygote is a diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum. 
    • Then comes the embryo and seedling.
    • Hence The correct sequence of reproductive stages seen in flowering plants is gametes, zygote, embryo, seedling. 
    • So, the correct answer is 'gametes, zygote, embryo, seedlings'.
  • Question 10
    1 / -0
    The ______ is the centermost tissue in a dicot stem.
    Solution
    Pith or medulla is a tissue in the stems of vascular plants. Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant. stem. In monocot stem, it extends also into flowering stems and roots. The pith is the centremost tissue in a dicot stem which is encircled by a ring of xylem. The xylem, in turn, is encircled by a ring of phloem.
    So, the correct answer is 'Pith'.
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