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Engineering
137 Views   |  

What is common in all the three, Funaria, Dryopteris  and Ginkgo? 

  • Option 1)

    Independent sporophyte 

  • Option 2)

    presence of archegonia 

  • Option 3)

    well developed vascular tissues 

  • Option 4)

    Independent gametophyte 

 
  Bryophyta - Non vascular terrestrial plants present mostly in moist places. - wherein Eg Riccia,Funaria,Anthoceros.     Characteristics of bryophyta - Main plant body is gametophytic and thalloid which is not differentiated into root, stem and leaves.Sporophyte is parasitic over gametophytic. Antheridium and archegonium present. -     Pterosida / Filicopsida (Ferns) - 1-Leaves are fan...
Engineering
134 Views   |  

Besides paddy fields cyanobacteria are also found inside vegetative part of:

  • Option 1)

    Cycas 

  • Option 2)

    Equisetum 

  • Option 3)

    Psilotum 

  • Option 4)

    pinus 

 
  Plant body of Gymnosperms - Differentiated into root, stem and leaves. - wherein Root: Coralloid roots of cycas is associated with N2 fixing blue green algae.Pinus is associated with endophytic fungi called mycorrhizae. Stem: Mostly erect, aerial, solid and cylindrical. Cycas root is unbranched. Pinus, Cedrus and conifers root is branched.     Cyano bacteria / Blue green algae - Gram...
Engineering
190 Views   |  

The plant body is thalloid in 

  • Option 1)

    Funaria 

  • Option 2)

    Sphagnum

  • Option 3)

    Salvinia

  • Option 4)

    Marchantia

 
  Hepaticopsida / Liverworts. - Gametophytic plant body is thalloid with a septate rhizoids and elaters are present in sporophytic stage. - wherein Eg Ricca, Marchantia.     Option 1) Funaria  This is incorrect option Option 2) Sphagnum This is incorrect option Option 3) Salvinia This is incorrect option Option 4) Marchantia This is correct option
Engineering
94 Views   |  

Which one of the following is wrongly matched?

  • Option 1)

    Nostoc-water blooms

  • Option 2)

    Spirogyra-Motile gametes 

  • Option 3)

    Sargassum-Chlorophyll c

  • Option 4)

    Basidiomycetes-puffballs

 
  Types of life cycle in chlorophyceae - Haplontic → Eg. Ulothrix, Spirogyra Diplontic → Eg. Caulerpa Diplohaplontic → Eg. Ulva, Cladophora. -     Reproduction in chlorophyceae - Vegetative by fragmentation or fission. Asexual by Zoospores. Sexual by Isogamous to oogamous. - Spirogyra belongs to class chlorophyceae where are non-motile (non flagelatted).   Option 1) Nostoc-water blooms This...
Engineering
410 Views   |  

Specialized cells for fixing atmospheric nitrogen in Nostoc are 

  • Option 1)

    Akinetes 

  • Option 2)

    Heterocysts 

  • Option 3)

    Hormogonia 

  • Option 4)

    Nodules 

 
As we learnt in Cyano bacteria / Blue green algae - Gram negative, photosynthetic, prokaryotes. Contain chlorophyll – a, carotene, phycobilin. Cell membrane lacks sterol. Reserve food material is cyanophycin protein, Cyanophycean starch, lipid globules. Non flagellate, moment by gliding motion, Some of them can fix atmospheric nitrogen in heterocysts. Eg. Nostoc and anabaena, - wherein Eg....
Engineering
134 Views   |  

Which of the following are likely to be present in deep sea water?

  • Option 1)

    Eubacteria 

  • Option 2)

    Blue-green  algae

  • Option 3)

    Saprophytic fungi

  • Option 4)

    Archaebacteria 

 
  Archaebacteria - Live in harsh habitats. Cell walls lack muramic acid and peptidoglycan. Branched lipids having Phytanyl side groups decreases membrane fluidity. - wherein They are of three major type Methanogens Halophiles Thermoacidophiles    Archaebacteria can survive in harsh environment, so they are present in deep sea Option 1) Eubacteria  This is incorrect answer Option...
Engineering
173 Views   |  

Which one of the following is not a correct statement?

  • Option 1)

    Botanical gardens have collection of living plants for reference 

  • Option 2)

    A museum has collection of photographs of plants and animals 

  • Option 3)

    Key is taxonomic aid for identification of specimens 

  • Option 4)

    Herbarium houses dried, pressed and preserved plant specimens 

 

Option 2 is correct answer

 

 

Engineering
345 Views   |  

The common characteristics between tomato and potato will be maximum at the level of their 

  • Option 1)

    Genus 

  • Option 2)

    Family 

  • Option 3)

    Order 

  • Option 4)

    Division 

 

Family 

Engineering
128 Views   |  

Syngamy can occur outside the body of the organism in

  • Option 1)

    Fungi

  • Option 2)

    Mosses

  • Option 3)

    Algae

  • Option 4)

    Ferns

 
As we discussed in concept External fertilisation - In most aquatic organisms, syngamy occurs in the external medium (water), i.e., outside the body of the organism. This type of gametic fusion is called external fertilisation. - wherein Organisms exhibiting external fertilisation show great synchrony between the sexes and release a large number of gametes into the surrounding medium (water) in...
Engineering
290 Views   |  

Monoecious plant of Chara shows occurrence of:

  • Option 1)

    stamen and carpel of the same plant

  • Option 2)

    upper antheridium and lower oogonium on the same plant

  • Option 3)

    upper oogonium and lower antheridium on the same plant

  • Option 4)

    antheridiophore and archegoniophore on the same plant

 
As we discussed in concept Sexuality in Plants - Plants having only one sex organ are called heterothallic or dioecious. Plants bearing both male and female flowers on the same individual, are called monoecious - wherein In flowering plants, the unisexual male flower is staminate, i.e., bearing stamens, while the female if pistillate or bearing pistils. Some examples of monoecious plants are...
Engineering
91 Views   |  

Meiosis takes place in :

  • Option 1)

    Conidia

  • Option 2)

    Gemmule

  • Option 3)

    Megaspore

  • Option 4)

    Meiocyte

 
As we discussed in concept Cell division during gamete formation - (a) Gametes in all heterogametic species are of two types namely male and female. (b) Gametes are always haploid irrespective of parent’s ploidy. (c) Gametes are produced by a haploid parent by mitotic division. (d) Gametes are produced by a diploid parent by meiotic division. (e) In diploid organisms specialized cells...
Engineering
95 Views   |  

Which one of the following is a hallucinogenic drug?

  • Option 1)

    opium

  • Option 2)

    caffeine

  • Option 3)

    Morphine

  • Option 4)

    Lysergic acid diethylamide

 
As we learnt in Effect of cocaine - Cocaine, commonly called coke or crack is usually snorted. - wherein It has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy. Excessive dosage of cocaine causes hallucinations.     Beside cocaine, Lysergic acid diethylamide (LSD), also known as acid, is also a psychedelic drug known for its...
Engineering
96 Views   |  

Tissue culture technique can produce infinite number of new plants from a small parental tissue. The economic importance of the technique is in raising

  • Option 1)

    Variants through picking up simaclonal variations

  • Option 2)

    Genetically uniform population identical to the original parent

  • Option 3)

    Homozygous diploid plants

  • Option 4)

    Development of new species

 
  tissue culture - tissue culture is the growth in an artificial medium of cells derived from living tissue. - wherein In plant world, it means that whole plants could be regenerated from explants, i.e., any part of a plant taken out and grown in a test tube, under sterile conditions in special nutrient media.       Option 1) Variants through picking up simaclonal variations This option is...
Engineering
94 Views   |  

Identify the site where Wuchereria bancrofti is normally found on human body

  • Option 1)

    Lymphatic vessels of the lower limbs

  • Option 2)

    Muscles of the legs

  • Option 3)

    Blood vessels of the thigh region

  • Option 4)

    Skin between the fingers

 
As we learnt in elephantiasis or filariasis - Wuchereria (W. bancrofti and W. malayi), the filarial worms that cause elephantiasis or filariasis - wherein       Option 1) Lymphatic vessels of the lower limbs This option is correct. Option 2) Muscles of the legs This option is incorrect. Option 3) Blood vessels of the thigh region This option is incorrect. Option 4) Skin between the...
Engineering
231 Views   |  

The H-zone in the skeletal muscle fibre is due to:

  • Option 1)

    extension of myosin filaments in the central portion of the A - band.

  • Option 2)

    the absence of myofibrils in the central portion of A - band.

  • Option 3)

    the central gap between myosin filaments in the A-band.

  • Option 4)

    the central gap between actin filaments extending through myosin filaments in the A -band.

 
  H Zone - In a resting state, the edges of thin filaments on either side of the thick filaments partially overlap the free ends of the thick filaments leaving the central part of the thick filaments. - wherein This central part of thick filament, not overlapped by thin filaments is called the ‘H’ zone.     sarcomere - The portion of the myofibril between two successive ‘Z’ lines is considered...
Engineering
311 Views   |  

The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic.

  • Option 1)
     

    D - Lower end of lungs - diaphragm pulls it down during inspiration.

  • Option 2)

    A - trachea - long tube supported by complete cartilaginous rings for conducting inspired air.

  • Option 3)

    B - pleural membrane - surround ribs on both sides to provide cushion against rubbing.

  • Option 4)

    C - Alveoli - thin walled vascular bag like structures for exchange of gases.

 
  Alveoli - Alveoli are the primary sites of exchange of gases.   - wherein Exchanged in these sites by simple diffusion mainly based on pressure/concentration gradient.     Option 1)   D - Lower end of lungs - diaphragm pulls it down during inspiration. Option is incorrect Option 2) A - trachea - long tube supported by complete cartilaginous rings for conducting inspired air. Option is...
Engineering
90 Views   |  

The characteristics and an example of a synovial joint in humans is:

Characteristics

Examples

 

  • Option 1)

    lymph filled between two bones, limited movement

    gliding joint between carpals

     

  • Option 2)

    fuid cartilage between two bones, limited movements

    Knee joint

     

  • Option 3)

    fluid filled between two joints, provides cushion

    skull bones

     

  • Option 4)

    fluid filled synovial cavity between two bones

    joint between atlas and axis

     

 
  Synovial joints - are characterised by the presence of a fluid filled synovial cavity between the articulating surfaces of the two bones. - wherein Such an arragement allows considerable movement. These joints help in locomotion and many other movements.     Option 1) lymph filled between two bones, limited movement gliding joint between carpals   Incorrect Option 2) fuid...
Engineering
157 Views   |  

Select the correct statement with respect to locomotion in humans:

  • Option 1)

    The joint between adjacent vertebrae is a fibrous joint.

  • Option 2)

    A decreased level of progesterone causes osteoporosis in old people.

  • Option 3)

    Accumulation of uric acid crystals in joints causes their inflammation.

  • Option 4)

    The vertebral column has 10 thoracic vertebrae.

 
  Disorders Of Muscular And Skeletal System - Gout - wherein Inflammation of joints due to accumulation of uric acid crystals.   Accumulation of uric acid crystals in joints and their inflammation called gout Option 1) The joint between adjacent vertebrae is a fibrous joint. Incorrect Option 2) A decreased level of progesterone causes osteoporosis in old people. Incorrect Option...
Engineering
206 Views   |  

The diagram given here is the standard ECG of a normal person. The P - wave represents the:

 

  • Option 1)

    End of systole

  • Option 2)

    Contraction of both the atria

  • Option 3)

    Initiation of the ventricular contraction

  • Option 4)

    Beginning of the systole

 
Steps to obtain a standard ECG - Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart. - wherein    P - wave represents contraction of both atria, which is associated with both left and right atrial depolarization Option 1) End of systole Option is Incorrect Option 2) Contraction of both the atria Option is...
Engineering
96 Views   |  

Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom:

Endocrine gland

Hormone

Function/deficiency symptoms

 

  • Option 1)

    Corpus luteum

    Testosterone

    Stimulates spermatogenesis

     

  • Option 2)

    Anterior pituitary

    Oxytocin

    Stimulates uterus contraction during child birth

     

  • Option 3)

     

    Posterior

    pituitary

    Growth

    Hormone

    (GH)

    Oversecretion Stimulates abnormal growth

     

  • Option 4)

     

    Thyroid gland

    Thyroxine

    Lack of iodine in diet results in goitre

     

 
  Hormones secreted by thyroid gland - These follicular cells synthesise two hormones, tetraiodothyronine or thyroxine (T4 ) and triiodothyronine (T3 ). -     Hypothyroidism - Iodine is essential for the normal rate of hormone synthesis in the thyroid - wherein Deficiency of iodine in our diet results in hypothyroidism and enlargement of the thyroid gland, commonly called goitre.     Option...
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