26075.In higher vertebrates, the immune system can distinguish self cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to:
Active immunity
Allergic response
Graft rejection
Auto-immune disease
Explanation:
Autoimmune disease is a group of disorder in which the cells of the acquired immunity loses the ability to differentiate between self and non self.
Autoimmune disease is a group of disorder in which the cells of the acquired immunity loses the ability to differentiate between self and non self.
26076.Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature?
When written by hand, the names are to be underlined
Biological names can be written in any language
The first word in a biological name represents the genus name, and the second is a specific epithet
The names are written in Latin and are italicised
Explanation:
According to the rules of IUCN the original names were taken from latin or Greek languages. New names are now derived either from Latin language or are latinised.
According to the rules of IUCN the original names were taken from latin or Greek languages. New names are now derived either from Latin language or are latinised.
26077.In bryophytes and pteridophytes, transport of male gametes requires:
Water
Wind
Insects
Birds
Explanation:
In Bryophytes and Pteridophytes the male gametes are motile and it requires water for fertilisation.
In Bryophytes and Pteridophytes the male gametes are motile and it requires water for fertilisation.
26078.In a context of Amniocentesis/ which of the following statement is incorrect?
It can be used for detection of Cleft palate.
It is usually done when a woman is between 14-16 weeks pregnant
It is used for prenatal sex determination.
It can be used for detection of Down syndrome.
Explanation:
Amniocentesis is a medical procedure used in prenatal diagnosis of chromosomal and genetic abnormalities such as Down’s syndrome. Turner’s syndrome, etc. It also helps in prenatal sex determination, hence there is a statutory ban on it to prevent female foeticide. It is done when woman is between 14-16 weeks pregnant.
It does not help in detection of cleft palate.
Amniocentesis is a medical procedure used in prenatal diagnosis of chromosomal and genetic abnormalities such as Down’s syndrome. Turner’s syndrome, etc. It also helps in prenatal sex determination, hence there is a statutory ban on it to prevent female foeticide. It is done when woman is between 14-16 weeks pregnant.
It does not help in detection of cleft palate.
26079.In the stomach, gastric acid is secreted by the:
acidic cells
gastrin secreting cells
parietal cells
peptic cells
Explanation:
Gastric acid - HCl is secreted by parietal cells of the stomach.
Gastric acid - HCl is secreted by parietal cells of the stomach.
26080.Spindle fibres attach on to:
Kinetosome of the chromosome
Telomere of the chromosome
Kinetochore of the chromosome
Centromere of the chromosome
Explanation:
Spindle fibres attach on to Kinetochore proteins in the Centromere of the chromosome.
Spindle fibres attach on to Kinetochore proteins in the Centromere of the chromosome.
26081.Which is the National Aquatic Animal of India?
Sea – horse
Gangetic shark
River dolphin
Blue whale
Explanation:
River Dolphin represents the purity of the holy Ganga as it can only survive in pure and fresh water.
River Dolphin represents the purity of the holy Ganga as it can only survive in pure and fresh water.
26082.Which one of the following cell organelles is enclosed by a single membrane?
Nuclei
Mitochondria
Chloroplasts
Lysosomes
Explanation:
Lysosomes is enclosed by a single membrane while Mitochondria, Chloroplasts and Nuclei are enclosed by double membrane.
Lysosomes is enclosed by a single membrane while Mitochondria, Chloroplasts and Nuclei are enclosed by double membrane.
26083.The two polypeptides of human insulin are linked together by:
Disulphide bridges
Hydrogen bonds
Phosphodiester bond
Covalent bond
Explanation:
Human insulin has peptide chains A and B linked together by Disulphide bridges.
Human insulin has peptide chains A and B linked together by Disulphide bridges.
26084.In which of the following, all three are macronutrients?
Nitrogen, nickel, phosphorus
Boron, zinc, manganese
Iron, copper, molybdenum
Molybdenum, magnesium, manganese
Explanation:
All four options are incorrect. All four options contain micronutrients.
Macronutrients are required in greater amount which is 1 mg/gram of plant dry weight.
All four options are incorrect. All four options contain micronutrients.
Macronutrients are required in greater amount which is 1 mg/gram of plant dry weight.
26085.Which of the following statements is wrong for viroids?
Their RNA is of high molecular weight
They lack a protein coat
They are smaller titan viruses
They cause infections
Explanation:
RNA of viroids has low molecular weight.
RNA of viroids has low molecular weight.
26086.Analogous structures are a result of:
Stabilizing selection
Divergent evolution
Convergent evolution
Shared ancestry
26087.Select the incorrect statement:
LH triggers secretion of androgens from the Leydig cells.
FSH stimulates the Sertoli cells which help in spermiogenesis.
LH triggers ovulation in ovary
LH and FSH decrease gradually during the follicular phase.
Explanation:
During follicular phase, FSH levels increase for maturation of follicles leading to formation of Graafian follicle.
During follicular phase, FSH levels increase for maturation of follicles leading to formation of Graafian follicle.
26088.Which one of the following characteristics is not shared by birds and mammals?
Warm-blooded nature
Ossified endoskeleton
Breathing using lungs
Viviparity
Explanation:
Ossified endoskeleton, Breathing using lungs and Warm blooded nature are characteristic of both birds and mammals except Viviparity, as birds are Oviparous.
Ossified endoskeleton, Breathing using lungs and Warm blooded nature are characteristic of both birds and mammals except Viviparity, as birds are Oviparous.
26089.Which of the following statements is not correct?
Some reptiles have also been reported as pollinators in some plant species
Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers
Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
Explanation:
More the one pollen tube of same species can grow into the style. It is frequently found in nature.
More the one pollen tube of same species can grow into the style. It is frequently found in nature.
26090.Seed formation without fertilization in flowering plants involves the process of:
Apomixis
Sporulation
Budding
Somatic hybridization
Explanation:
The process of formation of seed without fertilization is called Apomixis. It is eqivalent to asexual reproduction examples are some species fo Asteraceae and grasses.
The process of formation of seed without fertilization is called Apomixis. It is eqivalent to asexual reproduction examples are some species fo Asteraceae and grasses.
26091.Which of the following approaches does not give the defined action of contraceptive?
Vasectomy - prevents spermatogenesis
Barrier methods - prevent fertilization
Intra uterine devices - increase phagocytosis of sperms, suppress sperm motility and fertilizing capacity of sperms
Hormonal contraceptives - prevent/retard entry of sperms, prevent ovulation and fertilization
Explanation:
Vasectomy is a permanent contraceptive method in which a small part of the vas deferens is removed or tied up through a small incision on the scrotum. It prevents entry of sperm into semen thus preventing fertilization.
Vasectomy is a permanent contraceptive method in which a small part of the vas deferens is removed or tied up through a small incision on the scrotum. It prevents entry of sperm into semen thus preventing fertilization.
26092.The amino acid Tryptophan is the precursor for the synthesis of:
Cortisol and Cortisone
Melatonin and Serotonin
Thyroxine and Triiodothyronine
Estrogen and Progesterone
26093.A river with an inflow of domestic sewage-rich in organic waste may result in:
The death of fish due to lack of oxygen.
Drying of the river very soon due to the algal bloom.
The increased population of aquatic food web organisms.
An increased production of fish due to biodegradable nutrients.
Explanation:
Organic wastes from domestic sewage when reaches the river, it increases the rate of reproduction of algae present in river. It causes Algal Bloom or Eutrophication due to which BOD of water increases life present below the algal bed dies due to lack of O2.
Organic wastes from domestic sewage when reaches the river, it increases the rate of reproduction of algae present in river. It causes Algal Bloom or Eutrophication due to which BOD of water increases life present below the algal bed dies due to lack of O2.
26094.Gause’s principle of competitive exclusion states that:
Larger organisms exclude smaller ones through competition.
More abundant species will exclude the less abundant species through competition.
Competition for the same resources excludes species having different food preferences.
No two species can occupy the same niche, indefinitely for the same limiting resources.
Explanation:
Gause’s principle of competitive exclusion explains competition between individual.
Gause’s principle of competitive exclusion explains competition between individual.