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NEET biology

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Question
CBSEENBI11003404
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Identify the incorrect statement about ABA growth regulator

  • It increases the tolerance of plants against different stresses.

  • It acts as general plant growth inhibitor and inhibitor of metabolism.

  • It helps in seed maturation and dormancy.

  • It promotes morphogenesis and differentiation of shoots.

Solution

D.

It promotes morphogenesis and differentiation of shoots.

Abscisic acid (ABA) is a growth inhibitor. Both auxins and cytokinins are essential for morphogenesis or differentiation of tissues and organs. Auxins stimulate root formation however when cytokinins are in excess stem buds develop.

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Question
CBSEENBI11003419
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Select the mismatched pair out of the following

  • Rhizome - Dryopteris, Nelumbo nucifera

  • Corm - Crocus sativus, Amorphophallus

  • Sucker -Curcuma domestica, Zingiber officinale

  • Tuber -Helianthus tuberosus, Solanum tuberosum

Solution

C.

Sucker -Curcuma domestica, Zingiber officinale

Sucker is a special non-green slender stem branch which arises from underground base of an erect shoot or crown. It grows horizontally in soil and ultimately comes out to form a new aerial shoot or crown. The process is repeated. Each sucker has one or more nodes with scale leaves and axillary buds, e.g., Chrysanthemum. Curcuma domestica and Zingiber officinale both are the examples of rhizomes

Question
CBSEENBI11003423
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Some salient features and phyla of organisms are given below. Select the option which shows correct combination of organism, its phylum and salient features.

  • Hydra coelenterate Bilateral symmetry Cnidoblasts present
  • Planaria Platyhelminthes Bilateral symmetry High Regeneration Capacity
  • Ancylostoma Annelida Bilateral symmetry Elongated and Worm shaped
  • Octopus Mollusca Radial symmetry External skeleton of
    shell present

Solution

B.

Planaria Platyhelminthes Bilateral symmetry High Regeneration Capacity

Hydra shows radial symmetry, Ancylostoma is an aschelminth. Octopus shows bilateral symmetry and also lacks an external skeleton of shell.

Question
CBSEENBI11003424
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An example of stretch reflex triggered by passive muscle movement is the

  • tendon reflex

  • ipsilateral reflex

  • flexor reflex

  • patellar reflex

Solution

D.

patellar reflex

A stretch reflex is the contraction of a muscle in response to a passive stretching of a muscle spindle within a muscle. This reflex enables the body to correct any unintended changes in body posture in a timely manner without waiting for input from the cerebral cortex as well as keeps appropriate tone in muscles. A well known example of stretch reflex is patellar reflex or knee jerk reflex, i.e., sudden kicking movement of the lower leg in response to a sharp tap on patellar tendon.

Question
CBSEENBI11003426
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The figure shows different human tissues labelled as A to D. Which option gives the correct identification of the label, its location and one feature.

  • D-Unicellular glandular epithelium, goblet cells, secrete saliva

  • B-Squamous epithelium, walls of blood vessels, form a diffusion boundary

  • A-Cuboidal epithelium, ducts of glands, secretion and absorption

  • C-Columnar epithelium, lining of stomach, secretion and absorption

Solution

D.

C-Columnar epithelium, lining of stomach, secretion and absorption

The given figure

A is squamousepithelium, found in walls of blood vessels and air sacs of lungs and is involved in functions like forming a diffusion layer.

B is cuboidal epithelium, found in ducts of glands and tubular parts of nephrons of kidney and its main functions are secretion and absorption.

C is columnar epithelium, found in lining of stomach and intestine and helps in secretion and absorption.

D is ciliated columnar epithelium, present in inner surface of hollow organs like bronchioles and Fallopian tubes and helps to move particles or mucus in a specific direction over the epithelium.

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