Elimination f insoluble calcium phophate takes place by
  • a)
    Large intestine
  • b)
    Lungs
  • c)
    Liver
  • d)
    Kidney
Correct answer is option 'A'. Can you explain this answer?

Anitha Jadhav answered  •  4 weeks ago
The calcium ions bind to the phosphateand are present in the dietary food sometimes calcium phosphate is a salt which is insoluble in water the calcium ions are absorbed by the cells of the intestinal as per the requirement the excess of calcium nd phosphate ions are excreted by the large intestine in the form of fences


hope u got it

The statement that illustrate the law of multiple proportions is
  • a)
    3.47 g of BaCl2 reacts with 2.36 g of Na2SO4 to give 3.88 g BaSO4 and 1.95 g NaCl.

     
  • b)
    Hydrogen sulphide contains 5.89% hydrogen, water contains 11.1% hydrogen and sulphur dioxide
    contains 50% oxygen.
  • c)
    An element forms two oxides, XO and XO2 containing 50% and 60% oxygen respectively. The ratio
    of masses of oxygen which combines with 1 g of element is 2 : 3.
  • d)
    20 mL ammonia gives 10 volumes N2 and 30 volumes H2 at constant temperature and pressure
Correct answer is option 'C'. Can you explain this answer?

MOHNISH LAL answered  •  Jun 08, 2020
In XO, 50 g element combines with 50 g oxygen
 1 g element combines with 1 g oxygen.
In XO2, 40 g element combines with 60 g oxygen
 1 g element combines with 1.5 g oxygen
Thus, ratio of masses of oxygen which combines with 1 g of element is 1 : 1.5 or 2 : 3. This is in
accordance with the law of multiple proportions. In (B) the law of reciprocal proportions is followed.
In (A) law of conservation of mass is followed while in (D) Avogadro’s law is followed

Blood of AB group cannot be given to B group patient because :
  • a)
    Patient has antibodies b
  • b)
    Patient lacks antibodies b
  • c)
    Patient lacks antibodies a
  • d)
    Patient has antibodies a
Correct answer is option 'D'. Can you explain this answer?

HARJOT SINGH answered  •  May 27, 2020
Persons with blood group B have B antigen on the surface of their RBCs and anti A antibodies (against A antigen) in their plasma. The person with AB blood group possesses both the antigens A and B on the surface of RBCs. If AB blood group is given to B group patient, agglutination occurs between anti A antibodies and A antigen.

Eco RI cleaves the DNA strands to produce :
  • a)
    Blunt ends
  • b)
    Sticky ends
  • c)
    Satellite ends
  • d)
    Ori replication end
Correct answer is option 'B'. Can you explain this answer?

HIRDESH SHARMA answered  •  May 21, 2020
This recognition site structure leads to a symmetrical cleavage of both DNA strands and results in either blunt- or sticky-ends of the digested DNA. Blunt ends are universally compatible with other blunt-ended DNA and possess a 5’ phosphate group to promote ligation. Sticky ends, on the other hand, are stretches of single-stranded DNA that is capable of selfligation or ligation with a complementary region of DNA from another molecule or organism.

Verticillaster is the modified form of :
  • a)
    Monochasial
  • b)
    Dichasial
  • c)
    Polychasial
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

SASWAT SINGH answered  •  May 20, 2020
A reduced raceme or cyme that grows in the axil of a bract is called a fascicle. A verticillaster is a fascicle with the structure of a dichasium; it is common among the Lamiaceae. Many verticillasters with reduced bracts can form a spicate (spike-like) inflorescence that is commonly called a spike.

The embryosac of an Angiosperm is made up of ?
  • a)
    8 cells
  • b)
    7 cells and 8 nuclei
  • c)
    7 cells and 7 nuclei 
  • d)
    8 cells 7 nuclei
Correct answer is option 'B'. Can you explain this answer?

SHREYAS ASHWIN answered  •  May 20, 2020
Embryo sac of an angiosperm contains 8 nuclei but 7 cells -3 micropylar, 3 chalazal and one central cell. The central cell is the largest cell and contains two polar nuclei.

The inheritance pattern of a gene over generation among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to :
  • a)
    Quantitative trait
  • b)
    Mendelian trait
  • c)
    Polygenic trait
  • d)
    Maternal trait
Correct answer is option 'B'. Can you explain this answer?

SHEIKH AHAMAD answered  •  May 20, 2020
Mendelian inheritance in humans is difficult to study. Current understanding of mendelian inheritance in humans is gained by analysis of family pedigrees or the results of matings that have already occured. By analyzing a pedigree, we may be able to predict how the trait is inherited. It is a visual tool for documenting the biological relationship in families and to determine the mode of inheritance (dominant, recessive etc.,) of genetic diseases. Whereas quantitative trait, polygenic trait and maternal traits are not studied bypedigree analysis. Continuous traits are often measured and given a quantitative value, they are often referred as quantitative traits, e.g., crop yield, weight, gain in animals, IQ, etc. Polygenic traits are another exception to mendels rule, which occurs when a trait is controlled by more than one gene. This means that each dominant allele adds to the expression of the next dominant allele. Maternal traits are the traits inherited and expressed from the maternal parent to the subsequent offsprings.

Which one of the following amines will give carbylamine reaction ?
  • a)
    C2H5NH2
  • b)
    (C2H5)3N
  • c)
    (C2H5)2NH
  • d)
    C3H7NHC2H5
Correct answer is option 'A'. Can you explain this answer?

GUNJAN KUMAR answered  •  May 20, 2020
Ethyl amine reacts with chloroform (CHCl3)(CHCl3) & Alcoholic KOH (KOH in ethanol) , then ethyl isocyanide is formed which is a bad smelling compound 

When a plant undergoes senescence the nutrients may be ?
  • a)
    Exported
  • b)
    Translocated
  • c)
    Withdrawn
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

VISHAL VERMA answered  •  May 20, 2020
When a plant undergoes senescence, mineral ions are frequently mobilized from older parts to apical and lateral meristems, young leaves, developing fruits and seeds by diffusion and by active uptake by cells in the growing regions. This is known as translocation of nutrients.

Aldosterone causes the reabsorption of Na- ions from which part of nephron
  • a)
    PCT
  • b)
    DCT
  • c)
    Renal artery
  • d)
    LOH
Correct answer is option 'B'. Can you explain this answer?

MRIGANK PATHAK answered  •  May 20, 2020
Aldosterone is a type of steroid hormone that acts primarily in renal collecting ducts to stimulate reabsorption of Na+ as well as secretion of K+ and H+. It binds with intracellular receptors in the nucleus that stimulate the expression of several genes.

Potatoes are vegetatively propagated from
  • a)
    Tubers
  • b)
    Offsets
  • c)
    Bulbils
  • d)
    Rhizomes
Correct answer is option 'A'. Can you explain this answer?

LOKENDRA CHOUDHARY answered  •  May 20, 2020
Potato is an underground modified stem. Potatoes mostly reproduce in vegetative manner. Potatoes have eyes like structure called nodes or buds. Shoots that come out from the buds are called sprouts which grow and become stems. They come out after a long period of dormancy. Roots also come out from the buds. The buds become new plants.
The part of the stem grows under the soil is called underground stem. This underground stem starts swelling and transform into tuber or new potato. When the tubers are fully grown the mother plant dies. Nodes of tuber again give rise to buds and new plants as well.

Which one of following is non-reducing ?
  • a)
    H2S
  • b)
    H2Te
  • c)
    H2Se
  • d)
    H2O
Correct answer is option 'D'. Can you explain this answer?

SOURAV SHARMA answered  •  May 20, 2020
Order of volatility  H2Te >  H2Se > H2S > H2O Water has the highest boiling point and thus is least volatile.

‘YAC’ refers to :
  • a)
    Yeast artificial cell
  • b)
    Yeast artificial chromosome
  • c)
    Yeast artificial colony
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

VAIBHAV HARINARAYAN answered  •  May 20, 2020
Yeast artificial chromosomes are genetically engineered chromosomes derived from the DNA of the yeast, Saccharomyces cerevisiae, which is then ligated into a bacterial plasmid.

Plasmodium vivax is transmitted by :
  • a)
    Tse-tse fly
  • b)
    Sand fly
  • c)
    Anopheles
  • d)
    Culex
Correct answer is option 'C'. Can you explain this answer?

SOURAV SHARMA answered  •  May 20, 2020
Tsetse fly - sleeping sickness sand fly - leishmaniasis anopheles - malaria culex - filariasis or elephantiasis caused by wuchereria bancrofti and wuchereria malayi

Chemosynthetic bacteria obtain energy from :
  • a)
    Sun
  • b)
    Infra red rays
  • c)
    Organic substances
  • d)
    Inorganic chemicals
Correct answer is option 'D'. Can you explain this answer?

BONNIE SIMON answered  •  May 20, 2020
In Inorganic Chemicals Chemosynthetic bacteria were the first organism on earth synthesise their own food by obtaining energy from chemicals like H2S,NO2, etc. Photosynthetic bacteria have taken their origin from Chemosynthetic bacteria. Sun, infrared rays and organic substances are not used as the sources of energy for Chemosynthetic bacteria.

At which phase of meiosis, the two cells, each with separated sister chromatids move towards opposite poles?
  • a)
    Anaphase-I
  • b)
    Anaphase-II
  • c)
    Metaphase-I
  • d)
    Metaphase-II
Correct answer is option 'B'. Can you explain this answer?

RISHABH ADITYA answered  •  May 20, 2020
Anaphase II
The two sister chromatids of each chromosome are captured by microtubules from opposite spindle poles. In metaphase II, the chromosomes line up individually along the metaphase plate. In anaphase II, the sister chromatids separate and are pulled towards opposite poles of the cell.

Which one of the following will not directly affect transpiration ?
  • a)
    Temperature
  • b)
    Light
  • c)
    Wind Speed
  • d)
    Chlorophyll content of leaves
Correct answer is option 'D'. Can you explain this answer?

AYUSH MAURYA answered  •  May 19, 2020
The chlorophyll content of leaves will not directly affect transpiration, while temperature, light and wind speed directly affect the transpiration.

When NaCl is doped with 1.0 x 10-3 mole of SrCl2 , what is the concentration of cation vacancies?
  • a)
    6.023 x 1020
  • b)
    6.022 x 1018
  • c)
    2 x 6.023 x 1020
  • d)
    3.011 x 1020
Correct answer is option 'B'. Can you explain this answer?

MOHIT SUNDERSINGH answered  •  May 19, 2020
NaCl is doped with 10-3 mole % of SrCl2.This means, 100 moles of NaCl are doped with 10-3 moles of SrCl2.
Therefore, 1mole of NaCl is doped with 10-3 /100 = 10-5 moles of SrCl2 or 10-5 moles of Sr2+.
Now,
One Sr2+ ion create one cation vacancy.
Therefore, no. of cation vacancies created by 10-5 moles Sr2+
= 10-5 moles/mole of NaCl
= 10-5 x 6.022 x 1023 / mole of NaCl
= 6.022 x 1018/ mole of NaCl

Which one of the following statements is true regarding digestion and absorption of food in humans ?
  • a)
    Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like Na+
  • b)
    Chylomicrons are small lipoprotein particles that are transported from intestine into blood capillaries
  • c)
    About 60% of starch is hydrolysed by salivary amylase in our mouth
  • d)
    Oxyntic cells in our stomach secrete the proenzyme pepsinogen
Correct answer is option 'A'. Can you explain this answer?

PRIYAM PANDEY answered  •  May 19, 2020
Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like Na⁺. Carbohydrates are absorbed as monosaccharides (simple sugars such as flucose, fructose, and galactose that cannot be further broken done by hydrolysis) or as disaccharides carbohydrates (such as sucrose, lactrose, maltose, and dextrin that can be hydrolyzed to two monosaccharides). These simpler molecules, however, must be obtained by the breaking down of polysaccharides, complex carbohydrates that contain many monosaccharides. Chief among these is amylase, a starch that accounts for 20 percent of dietary carbohydrate.

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