Which is smallest cell either mycoplasma or PPLO?

Ashwin Singh answered  •  8 hours ago
Ncert ne book me mycoplasma ko smallest living cell khaa hee....but in reality pplo is smaller than mycoplasma

Heart is present in which area?

Kaviya Lakshmi answered  •  10 hours ago
The human heart is located within the thoracic cavity, medially between the lungs in the space known as the mediastinum

A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
[1993]
  • a)
    Cork cambium
  • b)
    Vascular cambium
  • c)
    Endodermis
  • d)
    Pericycle
Correct answer is option 'B'. Can you explain this answer?

Kaviya Lakshmi answered  •  11 hours ago
In dicotyledonous stems of temperate trees, during secondary growth, vascular cambial ring(narrow layer of thin-walled cells) produces secondary phloem towards outer side and secondary xylem or wood towards inner side. So, the correct option is ‘vascular cambium’.

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Who asserted that the natural state of body is the state of rest?

Kaviya Lakshmi answered  •  11 hours ago
 Aristotle asserted that object stay in motion only if they are pushed, but left to
themselves object come to a state of rest. So the state of “rest” is the natural state of motion to which all
things return. 

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When a tree grows older which of the following increase rapidly -
  • a)
    Heart wood
  • b)
    Sap wood
  • c)
    Pith
  • d)
    Cortex
Correct answer is option 'A'. Can you explain this answer?

Ragini Shukla answered  •  12 hours ago
In old trees , the greater part of the secondary xylem is dark brown due to the deposition of the organic compounds like resins , gums , oils aromatic substance and tannins in the innermost layers of the stem . These substances make it hard, durable and resistant towards the attack of microorganisms and insects. This region comprises dead elements with highly lignified walls and it is known as the... more

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Os-cordis a bone in-
  • a)
    Whale
  • b)
    Bats
  • c)
    Cattle
  • d)
    Polar bear
Correct answer is option 'C'. Can you explain this answer?

Ragini Shukla answered  •  12 hours ago
The cardiac skeleton provides the rigidity to prevent the dilatation of valves and outflow tracts , give attachment to valves leaflets and myocardium and electrically isolates the atria from the ventricle. The presence of OS CORDIS is a regular finding in the large ruminants such as in cattles, like ox, buffaloes, sheeps and etc but it is not reported in other mammals. In cattles the OS CORDIS is... more

Multiple alleles are present:
  • a)
    On non-sister chromatids
  • b)
    On different chromosomes
  • c)
    At different loci on the same chromosome
  • d)
    At the same locus of the chromosome
Correct answer is option 'D'. Can you explain this answer?

Kaviya Lakshmi answered  •  12 hours ago
Multiple alleles refer to the presence of more than two alternate forms of a gene which should be accommodated on two loci on a homologous pair. This is facilitated by the presence of more than one allele on the same locus of a chromosome provided one allele is present at a locus at a time. Thus, the correct answer is option D.

Coconut water from a tender coconut is              [2015 RS]
  • a)
    Free nuclear endosperm
  • b)
    Innermost layers of the seed coar
  • c)
    Degenerated nucellus
  • d)
    Immature emryo
Correct answer is option 'A'. Can you explain this answer?

Kaviya Lakshmi answered  •  12 hours ago
Tender coconut water is a clear liquid found inside of the young tender coconut. During the nuclear phase of the development, it provides as a termination for the endosperm of the coconut. In the nuclear endosperm formation, free-nuclear divisions are repeatedly done; if a cell wall is developed it will form after free-nuclear divisions. Commonly referred to as liquid endosperm. Coconut water from... more

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PCR and restriction fragment length polymorphism are methods for
  • a)
    Genetic fingerprinting
  • b)
    Genetic transformation
  • c)
    DNA sequencing
  • d)
    Study of enzymes
Correct answer is option 'A'. Can you explain this answer?

Kaviya Lakshmi answered  •  13 hours ago
PCR and RFLP are the methods used for genetic fingerprinting. DNA fragmentation plays an important part in forensics, especially that of DNA profiling. Restriction fragment length polymorphism (RFLP) analyses the variable lengths of DNA fragments which are formed from the digestion of a DNA sample with a restriction endonuclease. They are then hybridized with DNA probes that bind to a complementar... more

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What is not true about sclereids?
[1996]
  • a)
    These are parenchyma cells with thickened lignified walls
  • b)
    These are elongated and flexible with tapered ends
  • c)
    These are commonly found in the shells of nuts and in the pulp of guava, pear, etc
  • d)
      These are also called the stone cells
Correct answer is option 'A'. Can you explain this answer?

Kaviya Lakshmi answered  •  15 hours ago
Correct option (a) These are parenchyma cells with thickened lignified walls Explanation Sclereids are broad sclerenchyma cells which may be oval, spherical, cylindrical, or stellate ln structure. Sclereids develop from sclerenchyma cells, occur singly or in groups to provide stiffness. These may be of different types, such as brachysclereids (stone cells) found in grit of pear, apple, macrosclere... more

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The most appropriate definition of an ovule/seed in terms of homologous structures is that it is
  • a)
    Integumented indehiscent sporangium having a single spore
  • b)
    Integumented gynosporangium
  • c)
    Integumented indehiscent megasporangium with a single megaspore
  • d)
    Integumented bud containing an egg
Correct answer is option 'C'. Can you explain this answer?

Kaviya Lakshmi answered  •  15 hours ago
Megasporangium" is a technical term given to an ovule, which contains nucellus, integuments and funiculus through which it is adhered to the placenta. In simple words, megasporangium along with its protective coverings, the integuments, is called ovule. Integuments cover an opening called micropyle, through which pollen tube enters the ovule during fertilisation. Thus, ovule is an integumented deh... more

Q) Sex organs of Riccia are _____. A) borne laterally B) projecting C) embedded D) occur in receptacles?

Kaviya Lakshmi answered  •  16 hours ago
Riccia belongs to the genus liverworts. The gametophytic plant body of Riccia is a branched dorsiventral thallus. The sex organs antheridia and archegonia are embedded in the thallus. The antheridium is embedded in an antheridial chamber that opens on the dorsal side of the thallus. The archegonium is linked to the thallus by a stalk.  Thus the correct answer is option C.

Radio wave diffract around building although light waves do not. The reason is that radio waves:
  • a)
    travel with speed larger than c
  • b)
    have much larger wavelength than light
  • c)
    carry news
  • d)
    are not electromagnetic waves.
Correct answer is option 'B'. Can you explain this answer?

Assiduous Student answered  •  18 hours ago
Both radio and light waves are EM waves, just in different frequency ranges. The wavelength of visible light is typically around the 600 nm range, which is 6/1000 of a millimeter (very small!). Radio waves on the other hand, often wave wavelengths of a few yards long. For a wave to diffract around an object, the size of the object must be on the same order of the wavelength of the wave.hence, opti... more

The undesirable sounds, which disturb our environment, are called
  • a)
    air pollution
  • b)
    noise pollution
  • c)
    soil pollution
  • d)
    nuclear pollution
Correct answer is option 'B'. Can you explain this answer?

Assiduous Student answered  •  19 hours ago
Noise pollution is considered to be any unwanted or disturbing sound that affects the health and well-being of humans and other organisms. .. option B is right ans

Why was the crofter so talkative and friendly with the peddler though he was a stranger?

1153 Gayatri Bansode answered  •  20 hours ago
The crofter was old man without wife and child, he was happy to get someone to talk in his lonlyness, to be relieved of his boredom and monotony. This is the reason he was so talkative and friendly with peddler

How many bone of a new born baby?

Jayendra Munipalli answered  •  20 hours ago
A new born human baby has 300 bones which eventually in due course of time fuse together to form 206 bones in adult age

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Mineral is component of nitrogenase and nitrate reductase both-
  • a)
    Fe
  • b)
    Mo
  • c)
    Mn
  • d)
    Ca
Correct answer is option 'B'. Can you explain this answer?

Assiduous Student answered  •  21 hours ago
Mo is required in the synthesis of nitrogenase and nitrate reductase and is present in the form of molybdoflavoprotein in these enzymes. These enzymes are crucial for fixing atmospheric nitrogen to the usable forms in plants.
Hence, B is the correct answer.

If a curved black body utensil is heated to high temperature and then brought in dark then?

Prateek Tomar answered  •  21 hours ago
Black body emitting the heat/energy , because a good absorber is also a good emitter

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