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Biology Test 257
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Biology Test 257
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  • Question 1/10
    4 / -1

    In cockroach, corpora cardiaca is closely associated with

    Solutions

    Corpora cardiaca are a pair of elongated structures present on either sides of oesophagus behind the brain. These glands secrete a hormone responsible for regulating the pulsatile rate of the heart, peristalsis of hindgut, etc.

     

  • Question 2/10
    4 / -1

    In dorsiventral (dicot) leaf,

    Solutions

    The bundle sheath extensions are made up of ground tissue between vascular bundles and leaf epidermis. It is a single layer of parenchyma and often collenchyma cells. Rest all options are incorrect.

     

  • Question 3/10
    4 / -1

    The seat of origin of lateral roots or the root branches in dicot root is

    Solutions

    The lateral roots are of endogenous origin, i.e. arise from a deeper layer. The seat of their origin is pericycle.

     

  • Question 4/10
    4 / -1

    In cockroach, mushroom gland is located in

    Solutions

    The mushroom-shaped gland in male cockroaches is present in the 6th and 7th abdominal segments. It acts as an accessory reproductive organ.

     

  • Question 5/10
    4 / -1

    Which among the following statements is/are true?

    Solutions

    Androecium in plants of family Fabaceae usually have 10 stamens, filaments may be distinct or all united into a tube (monoadelphous) or 9 united into a strap with one free filament (diadelphous). Asparagus is a member of Asparagaceae family splitted from Liliaceae family.

     

  • Question 6/10
    4 / -1

    While studying morphology and anatomy of following plants, roots are not seen in

    Solutions

    Many plants growing in aquatic habitats lack roots. This is because, there is little or no requirement for the absorption of water and mineral salts, e.g. Utricularia (bladder wort), Wolffia, etc.

     

  • Question 7/10
    4 / -1

    In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues?

    Solutions

    Primary tissue is undifferentiated and does not perform any specific function. These are derived directly from the embryonal tissues, e.g. shoot tips and root tips.

     

  • Question 8/10
    4 / -1

    Straphiole is

    Solutions

    Strophiole is an outgrowth of the hilum region, which restricts water movement into and out of some seeds.

     

  • Question 9/10
    4 / -1

    Match the following columns and choose the correct option from the codes given below.

    Solutions

    The correct matches are

    Syncytium- A multinucleate condition due to free nuclear division (abnormal mitosis)

    Spermatocytes- Meiosis (primary)

    Amoeba- Amitosis (nucleus directly divides into daughter cells)

     

  • Question 10/10
    4 / -1

    Amino acids are mostly synthesised from

    Solutions

    Amino acids are mostly synthesised from -ketoglutaric acids. These are known as precursor of amino acids.

     

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