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sona answered  •  Dec 06, 2020
Https://edurev.page.link/rfiL8NUvgpuUbaQW9

Agamospermous embryos develop from
  • a)
    Pollen
  • b)
    Egg
  • c)
    Ovum
  • d)
    MMC
Correct answer is option 'D'. Can you explain this answer?

Ishika Balhara answered  •  Dec 05, 2020
Because it is a kind of apomixis as MMC is diploid and we can make embryo without fertilization

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?

Kaviya Lakshmi answered  •  Dec 05, 2020
Verticillaster inflorescence is a condensed form of dichasial (biparous) cyme with a cluster of sessile or sub-sessile flowers in the axil of a leaf, forming a false whorl of flowers at the node. This type of inflorescence is characteristic of Lamiaceae (Labiatae) family. Hence the correct answer is option B.

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change?
  • a)
    First negative, then positive and again back to negative.
  • b)
    First positive, then negative and continue to be negative
  • c)
    First negative, then positive and continue to be positive
  • d)
    First positive, then negative and again back to positive
Correct answer is option 'A'. Can you explain this answer?

Kaviya Lakshmi answered  •  Dec 05, 2020
During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has first NEGATIVE charge, due to the high concentration of potassium ions inside high concentration of sodium outside. This state is known as resting phase and the potential is known as rest potential. The nerve cells are stimulated by nerve signals the voltage-gated sodium chann... more

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?

Kaviya Lakshmi answered  •  Dec 05, 2020
Sticky ends are formed when the restriction enzymes cut the DNA molecule at such a position that it leaves an overhanging stretch of the nitrogenous base which can pair with the complementary base pairs. 
EcoRI cut through the DNA strands at nucleotides that overhangs at the end.
This overhanging nucleotide strand is called a sticky end because it can easily bond with complementary DNA fragments.

Growth, development and functioning of living body
  • a)
    Order
  • b)
    Homeostasis
  • c)
    Metabolism
  • d)
    Adaptation
Correct answer is option 'C'. Can you explain this answer?

Kaviya Lakshmi answered  •  Dec 05, 2020
A. A group of organisms of different families with related characters is called Order.
B. the ability or tendency of a living organism, or cells, to keep the internal conditions in an equilibrium state, despite any changes in the external environment is called Homeostasis.
C. the sequence of biochemical reactions occur in the cells of living organisms, and that provide energy for vital processes like growth, development, and functioning of the body is called metabolism.
D. the process, involves the survival of living organisms in a new environment, by developing new changes in their bodies is called adaptations. 
So, the correct answer is ‘Growth, development, and functioning of the living body is due to metabolism’ this should contain the option which is correct.

What is action potential.?

Gangundi Varsshinie answered  •  Dec 04, 2020
The change in electrical potential associated with the passage of an impulse along the membrane of a muscle and nerve cell.

System of classification used by Linnaeus
  • a)
    Natural system
  • b)
    Artificial system
  • c)
    Phylogenetic system
  • d)
    Asexual system
Correct answer is option 'B'. Can you explain this answer?

Gangundi Varsshinie answered  •  Dec 04, 2020
Artificial system of classification was given by CV Linnaeus. He considered some morphological characteristics and he also considered some reproductive characters also so his classification is also known as sexual system of classification.

Chromosomes are best visible in which stage?

Gangundi Varsshinie answered  •  Dec 04, 2020
Metaphase is a stage in the cell cycle where all the genetic material is condensing into chromosomes.These chromosomes are then best visible.

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?

Chandreshwar Mishra answered  •  Nov 27, 2020
Blood of AB group cannot be given to B group patient because :
The ABO blood group system consists of 4 types of blood group – A, B, AB, and O and is mainly based on the presence or absence of antigens on RBC and antibodies in the plasma. Individuals with AB blood group have Both Antigen A and Antigen B on RBC and no antibodies in plasma and individuals with B blood group have antigen B on RBC and Anti A antibodies in plasma. Blood of AB group cannot be given to B group patient because the patient has Anti A antibodies. The Anti A antibodies attack the blood cells of AB blood group person (as they have Antigen A on their RBC) and destroy them.
So, the correct answer is 'No Anti A and Anti B antibody'.

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Åãryåñ answered  •  Nov 20, 2020
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By which sugar insects muscle or wings never fatigue?

Akanksha Mahalle answered  •  Nov 18, 2020
Trehalose sugar--->The non-reducing disaccharide, trehalose, is found in the haemolymph of several insects, and trehalose is an insect blood sugar..Trehalose is the major carbohydrate energy storage molecule used by insects for flight.One possible reason for this is that the glycosidic linkage of trehalose, when acted upon by an insect trehalase, releases two molecules of glucose, which is require... more

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?

Akanksha Mahalle answered  •  Oct 22, 2020
Aldosterone causes sodium to be absorbed and potassium to be excreted into the lumen by principal cells. In alpha intercalated cells, located in the late distal tubule and collecting duct, hydrogen ions and potassium ions are exchanged. Hydrogen is excreted into the lumen, and the potassium is absorbed.Aldosterone (C21H28O5) is a mineralocorticoid hormone compound secreted by the adrenal gland cor... more

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?

Akanksha Mahalle answered  •  Oct 14, 2020
External factors affecting the rate of transpiration are: atmospheric humidity, temperature, light, wind velocity, atmospheric pressure and available soil water. Some internal factors also affect rate of transpiration e.g., leaf area, leaf structure and age of plants. Chlorophyll content of leaves does not directly affect rate of transpiration. hence, option d is correct one.

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?

Akanksha Mahalle answered  •  Oct 14, 2020
In meiosis, two divisions occur after one round of DNA replicatIon. The first division is reductional and homologous chromosomes separate during this division but second division is equational as centromere splits during second division. Sister chromatids move towards opposite poles in anaphase II of second division.
hence , correct option is b.

Which of the following is the contractile protein of a muscle ?
  • a)
    Tropomyosin
  • b)
    Tubulin
  • c)
    Myosin
  • d)
    All of the these
Correct answer is option 'C'. Can you explain this answer?

Akanksha Mahalle answered  •  Oct 14, 2020
Myosin is formed of the myofibril, which is very fine contractile fibres. Myofibril is groups of fibres, which extend in parallel columns along the length of striated muscle fibres. These binds to the actin and leads to shortening of sarcomeres. It hydrolyzes the ATP to form ADP, which is used for muscle contraction.

‘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?

Akanksha Mahalle answered  •  Oct 14, 2020
YAC refers to the yeast artificial chromosome which is derived from DNA of yeast S. ... The DNA is ligated into the bacterial plasmid. By inserting large fragments of DNA, the inserted sequences can be cloned and mapped by chromosome walking and this method was used in the Human Genome Project.

volume of urine is regulated by 
  • a)
    Aldosterone
  • b)
    Aldosterone,ADH and testosterone
  • c)
    Aldosterone and ADH
  • d)
    none of these
Correct answer is option 'C'. Can you explain this answer?

Akanksha Mahalle answered  •  Oct 13, 2020
The concentration of urine is controlled by vasopressin by regulating the reabsorption of water in the collecting tubule. It is known as antidiuretic hormone released by the posterior pituitary. It triggers the release of aldosterone and increases the concentration of sodium ions in the blood. The increased salt concentration in the blood increases the blood osmotic potential which further increas... more

Amount of urea is minimum in
  • a)
    pulmonary vein
  • b)
    hepatic artery
  • c)
    hepatic portal vein
  • d)
    renal vein
Correct answer is option 'D'. Can you explain this answer?

Akanksha Mahalle answered  •  Oct 13, 2020
Renal vein contains the least amount of urea. The renal artery enters the kidney as afferent arteriole. It carries the urea loaded blood into the glomerulus of the kidney. The blood is filtered by the glomerulus into the Bowman's capsule and runs parallel to the Loop of Henle. The urea is absorbed into the nephric filtrate by the process of tubular secretion in the loop of Henle, distal convoluted... more

The term "New Systematics" was introduced by
  • a)
    Bentham & Hooker
  • b)
    Linnaeus
  • c)
    Julian Huxley
  • d)
    A.P. de Candolle
Correct answer is option 'C'. Can you explain this answer?

Akanksha Mahalle answered  •  Oct 11, 2020
The term New Systematics was given by Sir Julian Huxley in 1940. This classification take into account the cytological , morphological , genetical , anatomical and physiological characters....A.P de Condolle termed taxonomy , Linnaeus is related to artificial taxonomy whereas Bentham & Hooker is related to natural classification system..New Systematics can also called as BIOSYSTEMATICS.

The kidney of adult mammals are
  • a)
    Mesonephros
  • b)
     rletanaphros
  • c)
    pronephros
  • d)
    Opisthonephron
Correct answer is option 'D'. Can you explain this answer?

Akanksha Mahalle answered  •  Oct 09, 2020
Opisthonephric kidney is the adult kidney of anamniotes such as shark and mud puppy and develops from all or most of nephric ridge posterior to pronephros.

Rhizome reproduction observed in
  • a)
    Potato
  • b)
    Ginger
  • c)
    Achhrynthus
  • d)
    All the above
Correct answer is option 'B'. Can you explain this answer?

Prem Darade answered  •  Oct 08, 2020
Rhizome is an horizontally growing underground stem as in ginger. Solanum tuberosum is potato, which can be propagated vegetatively by fleshy stem called tuber. Achyranthes usually shows sexual reproduction.

Totipotent Cell in hydra known as
  • a)
    Choanocyte cell
  • b)
    Interstitial cell
  • c)
    Vegetative cell
  • d)
    Reproductive cell
Correct answer is option 'B'. Can you explain this answer?

Aiswarya Aishu answered  •  Oct 05, 2020
Totipotency means the part of plant tissue capable to give raise to a new one.totipotency is the key word used in tissueculture.interstitial cell of hydra is totipotent cell.
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