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NEET UG Unit 2A: Ecosystem Services, Succession and Biodiversity — practice questions — page 2

Explore 61 free Unit 2A: Ecosystem Services, Succession and Biodiversity questions in NEET UG Environmental Science. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 2A: Ecosystem Services, Succession and Biodiversity questions and exercises with answers

Showing questions 31–60 of 61.

In the dicot stem, the endodermis is also called theRead the answer and worked solution →The vascular bundles in the dicot stem areRead the answer and worked solution →In monocot stems, the vascular bundles areRead the answer and worked solution →In dicot stems, the cambium between xylem and phloem makes the vascular bundleRead the answer and worked solution →In a dicot leaf, the mesophyll is differentiated intoRead the answer and worked solution →Stomata are MORE numerous on which leaf surface in a dicot?Read the answer and worked solution →The conjuctive tissue in a dicot root liesRead the answer and worked solution →All tissues inside the endodermis of a root collectively form theRead the answer and worked solution →Sclerenchymatous bundle sheaths surround vascular bundles inRead the answer and worked solution →In a dicot stem cross section, medullary rays areRead the answer and worked solution →Which feature is CHARACTERISTIC of an isobilateral (monocot) leaf?Read the answer and worked solution →The cuticle is generally ABSENT inRead the answer and worked solution →The cells next to phloem on the inner side of dicot stem endodermis formRead the answer and worked solution →Conjoint, open and endarch vascular bundles arranged in a ring are diagnostic ofRead the answer and worked solution →Vasa recta is the structural analog (functional, not anatomical) in PLANTS ofRead the answer and worked solution →Mosses are ecologically important because theyRead the answer and worked solution →Which one of the following is correctly matched?Read the answer and worked solution →An animal is called a true coelomate when its body cavity is:Read the answer and worked solution →Which feature is shared by ALL pteridophytes but ABSENT in bryophytes?Read the answer and worked solution →Heterospory, the production of two types of spores (microspores and megaspores), is seen inRead the answer and worked solution →The outermost layer of the primary plant body is theRead the answer and worked solution →Casparian strips are found in theRead the answer and worked solution →The monocot root differs from the dicot root in havingRead the answer and worked solution →Hypodermis of a typical dicot stem is composed ofRead the answer and worked solution →Pericycle in the dicot root gives rise toRead the answer and worked solution →Phloem parenchyma is GENERALLY ABSENT inRead the answer and worked solution →The endarch protoxylem position is seen inRead the answer and worked solution →Trichomes on the stem are usuallyRead the answer and worked solution →Vascular bundles in roots have xylem and phloem arrangedRead the answer and worked solution →Most members of which phylum are asymmetrical?Read the answer and worked solution →

Worked practice questions

In the dicot stem, the endodermis is also called the

  1. Mesophyll of the leaf tissue
  2. Starch sheath due to starch grains
  3. Conjuctive tissue between bundles
  4. Bundle sheath around vein
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Correct answer: B. Starch sheath due to starch grains

Dicot stem endodermis contains many starch grains and is called the 'starch sheath'. Conjuctive tissue lies between xylem and phloem in dicot roots bundle sheath surrounds leaf vascular bundles.

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The vascular bundles in the dicot stem are

  1. Arranged in a ring around the pith
  2. Scattered across the ground tissue
  3. Arranged in radial fashion of roots
  4. Bicollateral all around the stem
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Correct answer: A. Arranged in a ring around the pith

Dicot stem vascular bundles are arranged in a RING around the central pith. Monocot stem bundles are SCATTERED in the ground tissue. This is one of the most diagnostic anatomical differences.

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In monocot stems, the vascular bundles are

  1. Bicollateral with two phloem zones
  2. Scattered with sclerenchymatous sheaths
  3. Arranged in a ring with cambium
  4. Radial as in dicot root system
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Correct answer: B. Scattered with sclerenchymatous sheaths

Monocot stem bundles are scattered through the ground tissue, each surrounded by a sclerenchymatous bundle sheath. Bundles are conjoint and closed (no cambium) larger toward the centre.

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More Environmental Science topics

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