The translocation of organic solutes in sieve tube members is supported by
1. Root pressure and transpiration pull
2. P-proteins
3. Mass flow involving a carrier and ATP
4. Cytoplasmic streaming
This is an intext question, section 11.2.3, NCERT. What occupies the space between the cell wall and the shrunken protoplast in a plasmolyzed cell
1. Hypertonic solution
2. Hypotonic solution
3. Air
4. Nothing, a vacuum is created
If by radiation, all nitrogenase enzymes are inactivated, then there will be no
1. Fixation of atmospheric nitrogen
2. Conversion from nitrate to nitrite in legumes
3. Conversion from ammonium to nitrate in soil
4. Fixation of nitrogen in legumes
(a) | (b) | (c) | |
1. | Carboxylation | Decarboxylation | Reduction |
2. | Decarboxylation | Reduction | Regeneration |
3. | Fixation | Transamination | Regeneration |
4. | Fixation | Decarboxylation | Regeneration |
In pathway, the 4-carbon compound transported to bundle sheath cells most commonly is:
1. | Glutamic acid | 2. | Malic acid |
3. | Oxaloacetic acid | 4. | Fumaric acid |
The enzyme, decarboxylase, catalyses the following step :
1. conversion of citric acid to cis aconitic acid
2. fumaric acid to malic acid
3. oxalosuccinic acid to -ketoglutaric acid
4. malic acid to oxaloacetic acid
For each ATP produced, what is the number of that passes through F0 from the intermembrane space to the matrix down the electrochemical proton gradient?
1. 1
2. 2
3. 3
4. 4
Plasticity in plant growth means that
1. Plant roots are extensible
2. Plant growth is dependent on the environment
3. Stems can extend
4. None of the above
For the purpose of ecological studies, the term population is applicable to individuals reproducing:
1. | Asexually | 2. | Sexually |
3. | Both 1 and 2 | 4. | Neither 1 nor 2 |
What is common to Lantana, Eichhornia, and African catfish?
1. | All are endangered species in India. |
2. | All are keystone species. |
3. | All are mammals found in India. |
4. | All the species are neither threatened nor indigenous species of India. |
If a population of 50 Paramoecium present in a pool increases to 150 after an hour, what would be the percent growth or birth rate per individual per hour?
1. | 100 | 2. | 200 |
3. | 50 | 4. | 150 |
Which of the following statements is wrong for viroids?
1. Their RNA is of high molecular weight
2. They lack a protein coat
3. They are smaller than viruses
4. They cause infections
Axile placentation is not seen in:
1. | China rose | 2. | Tomato |
3. | Lemon | 4. | Pea |
Meiosis results in
1. Production of gametes
2. Reduction in the number of chromosomes
3. Introduction of variation
4. All of the above
Rearrange the following zones as seen in the root in vertical section and choose the correct option.
A. Root hair zone
B. Zone of meristems
C. Rootcap zone
D. Zone of maturation
E. Zon of elongation
Options:
1. | C, B, E, A, D | 2. | A, B, C, D, E |
3. | D, E, A, C, B | 4. | E, D, C, B, A |
A conjoint and open vascular bundle will be observed in the transverse section of
1. | Monocot root | 2. | Monocot stem |
3. | Dicot root | 4. | Dicot stem |
Which of the following is not a viral disease?
1. | Influenza | 2. | Yellow fever |
3. | Japanese encephalitis | 4. | Kala azar |
Consider the following two statements:
I. In Selaginella and Salvia, development of zygotes into young embryos takes place within the female gametophyte.
II. Selaginella and Salvia are homosporous pteridophytes
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is true but II is false
4. I is false but II is true
The scientific term for biological classification categories is:
1. Species | 2. Taxon |
3. Phylum | 4. Domain |
Which one of the following pairs is incorrectly matched?
Microorganism |
Product obtained |
|
1. |
Coliforms |
Vinegar |
2. |
Methanogens |
Gobar gas |
3. |
Yeast |
Ethanol |
4. |
Streptomycetes |
Antibiotic |
The term “linkage” was coined by :
1. T. Boveri
2. G. Mendel
3. W. Sutton
4. T.H. Morgan
The gynoecium consists of many free pistils in flowers of
1. Aloe
2. Tomato
3. Papaver
4. Michelia
The two polynucleotide chains of DNA are
1. Discontinuous
2. Antiparallel
3. Parallel
4. Semiconservative
What proportion of progeny in F2 generation in a Mendel monohybrid cross resembled the parent [of P generation] that expressed the recessive trait?
1. | ¼ | 2. | ½ |
3. | ¾ | 4. | 2/3 |
Which of the following is not a feature of the double helix model of DNA?
1. | The two chains have anti-parallel polarity |
2. | A purine always comes opposite to a pyrimidine |
3. | The pitch of the DNA is 3.4 nm |
4. | The two chains are coiled in a left handed fashion |
Majority of the flowering plants produce:
1. | Female flowers | 2. | Male flowers |
3. | Hermaphroditic flowers | 4. | Neutral flowers |
Syngamy in angiosperms results in the formation of:
1. | A haploid cell | 2. | A diploid cell |
3. | A triploid cell | 4. | A polyploid cell |
Identify the incorrect statement regarding test cross?
1. It is used to determine the genotype of an individual exhibiting a dominant phenotype.
2. The testcross parent is always homozygous recessive for all of the genes under consideration.
3. The purpose of the testcross is to discover how many different kinds of gametes are being produced by the individual whose genotype is in question.
4. A homozygous dominant individual will produce two types of progeny and a heterozygous individual will produce only one type of progeny.
Which of the following pairs of codons encode the same amino acid?
1. | AUG and AUC | 2. | UAA and UAC |
3. | GUA and GUG | 4. | UAG and UAC |
What is true regarding the activated sludge generated during the secondary treatment of sewage water?
I: | It is made up of aerobic bacteria that sediment down |
II: | A large part of the activated sludge is pumped back into the aeration tank to serve as the inoculum. |
III: | A minor part of the sludge is pumped into large tanks called anaerobic sludge digesters. |
1. | Only I | 2. | Only II and III |
3. | Only I and III | 4. | I, II and III |
Consider the following statements regarding meiosis:
I. At metaphase I, the microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes.
II. At anaphase I, the homologous chromosomes separate, while sister chromatids remain associated with each other.
Of the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Which of the following is not considered as a part of the endo-membranous system of a eukaryotic cell?
1. | Lysosomes | 2. | Vacuoles |
3. | Endoplasmic reticulum | 4. | Peroxisomes |
Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells?
1. | Peroxisomes | 2. | Golgi bodies |
3. | Polysomes | 4. | Endoplasmic reticulum |
During Meiosis I, in which stage synapsis takes place?
1. Pachytene
2. Zygotene
3. Diplotene
4. Leptotene
Which is the basis of genetic mapping of the human genome as well as DNA fingerprinting ?
(1) Polymorphism in the DNA sequence
(2) Single nucleotide polymorphism
(3) Polymorphism in hnRNA sequence
(4) Polymorphism in the RNA sequence
How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
1. | 1% | 2. | 10% |
3. | 40% | 4. | 90% |
According to IUCN Red List, what is the status of Red Panda (Ailurus fulgens)
1. Critically endangered species
2. Endangered species
3. Vulnerable species
4. Extinct species
Bhopal gas tragedy of 1984 took place because methyl isocyanate reacted with
1. DDT
2. Ammonia
3.
4. Water
The major source of noise pollution in the world is:
1. Office equipment
2. Transport system
3. Sugar, textile, and paper industries
4. Oil refineries and thermal power plants
What is true about ribosomes ?
1. The prokaryotic ribosomes are 80S, where "S" stands for sedimentation coefficient
2. These are composed of ribonucleic acid and proteins
3. These are found only in eukaryotic cells
4. These are self-splicing introns of some RNAs
Plants show mitotic divisions:
1. only in germ line cells
2. at the root apex and shoot apex only
3. in both diploid and haploid cells
4. for the productions of gametes only
The primary treatment of wastewater involves the removal of:
1. | dissolved impurities | 2. | stable particles |
3. | toxic substances | 4. | harmful bacteria |
Which one represents male gamete?
1. Antipodals
2. Synergids
3. Endosperm
4. Pollen grain
A harmful condition which is also a potential saviour from a mosquito borne infectious disease
1. Thalassemia
2. Sickle cell anaemia
3. Leukemia
4. Pernicious anaemia
ABO blood groups in humans are controlled by the gene I. It has three alleles -IA,IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
1. One
2. Four
3. Two
4. Three
Seed formation without fertilization in flowering plants involves the process of:
1. Apomixis
2. Sporulation
3. Budding
4. Somatic hybridization
DNA-dependent RNA polymerase catalyzes polymerization in:
1. | Only in 3’ – 5’ direction |
2. | Only in 5’ – 3’ direction |
3. | In both directions |
4. | In neither directions |
If E.coli was allowed to grow for 80 minutes after transfer from 15N to 14N medium, the number of hybrid density DNA molecules would be:
1. | 2 | 2. | 16 |
3. | 14 | 4. | 8 |
The Indian Agricultural Research Institute, New Delhi, has released several vegetable crops that are rich in vitamins and minerals. Identify the incorrectly matched:
1. | vitamin A enriched: carrots, spinach, pumpkin; |
2. | vitamin C enriched: bitter gourd, bathua, mustard, tomato; |
3. | iron and calcium enriched: spinach and bathua; |
4. | Omega fatty acids enriched: beans - broad, lablab, French and garden peas. |
Which is the most common type of embryo sac in angiosperms?
1. Tetrasporic with one mitotic stage of divisions
2. Monosporic with three sequential mitotic divisions
3. Monosporic with two sequential mitotic divisions
4. Bisporic with two sequential mitotic divisions
Which one of the following pairs of hormones are the examples of those that can easily pass through the cell membrane of the target cell and bind to a receptor inside it (mostly in the nucleus)?
1. | Insulin and glucagon | 2. | Thyroxine and insulin |
3. | Somatostatin and oxytocin | 4. | Cortisol and testosterone |
Ectopic pregnancies are referred to as :
1. | pregnancies with a genetic abnormality |
2. | implantation of the embryo at a site other than the uterus |
3. | implantation of a defective embryo in the uterus |
4. | pregnancies terminated due to hormonal imbalance |
Chemosensitive area of respiratory centre medulla is affected by
1. less and ions
2. less and ions
3. excess and H+ ions
4. excess and H+ ions.
Which one of the following groups of animals is correctly matched with its one characteristic feature without
even a single exception ?
1. Reptilia : possess 3 - chambered heart with one incompletely divided ventricle
2. Chordata : possess a mouth provided with an upper and lower jaw
3.Chondrichthyes : possess cartilaginous endoskeleton
4.Mammalia : give birth to young one
What is not true regarding Cnidarians?
1. Body is mode of distinct tissues but true organs have not evolved
2. They are carnivores
3. They may have two body forms – polyps and medusa
4. The digestion is completely intra-cellular
Triploblastic organization, bilateral symmetry but lack of coelom will be seen in:
1. | Planaria | 2. | Pheretima |
3. | Periplaneta | 4. | Pinctada |
In cockroach, a chitinous hard exoskeleton covers:
1. The head segment only
2. The head and the thorax segment only
3. The thorax and the abdomen only
4. The entire body
The bacterium (Clostridium botulinum) that causes botulism is
1. A facultative aerobe
2. An-obligate aerobe
3. A facultative anaerobe
4. An obligate anaerobe
Human insulin is being commercially produced from a transgenic species of
1. Rhizobium
2. Saccharomyces
3. Mycobacterium
4. Escherichia
Given below is a sample of a portion of DNA strand. What is so special shown in it
5' GAATTC 3'
3' CTTAAG 5'
1. Replication completed
2. Deletion mutation
3. Start codon at the 5' end
4. Palindromic sequence of base pairs
The part of the brain most commonly affected by the consumption of alcohol is :
1. | Medulla oblongata | 2. | Reticular formation |
3. | Cerebellum | 4. | Cerebrum |
Recombinant therapeutic [used for treatment] products are available for all the following disorders except:
1. | Hemophilia A | 2. | Pituitary dwarfism |
3. | Diabetes insipidus | 4. | Anemia due to renal failure |
What limitation of traditional hybridization procedures used in plant and animal breeding can be overcome by recombinant DNA procedures?
I: | Inclusion and multiplication of undesirable genes |
II: | Inability of inclusion of desirable traits from other species |
1. | Only I | 2. | Only II |
3. | Both I and II | 4. | Neither I nor II |
Which of the following gastric cells indirectly help in erythropoiesis?
1. Goblet cells
2. Mucous cells
3. Chief cells
4. Parietal cells
The contraceptive ‘SAHELI’:
1. | is an IUD. |
2. | increases the concentration of estrogen and prevents ovulation in females. |
3. | blocks estrogen receptors in the uterus, preventing eggs from getting implanted. |
4. | is a post-coital contraceptive. |
Erythropoiesis starts in
1. Kidney
2. Liver
3. Spleen
4. Red bone marrow
In competitive inhibition, if the concentration of the substrate is increased :
1. the rate of the reaction is increased
2. the rate of the reaction is decreased
3. the rate of the reaction is not affected
4. the reaction direction is reversed
A gymnast is able to balance his body upside down even in total darkness because of
1. Cochlea
2. Vestibular apparatus
3. Tectorial membrane
4. Organ of corti
It is much easier for a small animal to run uphill than for a large animal, because
1. It is easier to carry a small body weight
2. Smaller animals have a higher metabolic rate
3. Small animals have a lower O2 requirement
4. The efficiency of muscles in large animals is less than in the small animals
Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II | ||
(a) | Glycosuria | (i) | Accumulation of uric acid in joints |
(b) | Gout | (ii) | Mass of crystallised salts within the kidney |
(c) | Renal calculi | (iii) | Inflammation in glomeruli |
(d) | Glomerulonephritis | (iv) | Presence of glucose in urine |
Codes:
(a) | (b) | (c) | (d) | |
1. | (ii) | (iii) | (i) | (iv) |
2. | (i) | (iii) | (ii) | (iv) |
3. | (iii) | (ii) | (iv) | (i) |
4. | (iv) | (i) | (ii) | (iii) |
Consider the following regarding the actions of steroidal hormones produced by human ovary:
I. Estrogen is responsible for the development and maintenance of secondary sexual characters in females
II. Progesterone is a pregnancy hormone
III. Estrogen regulates female sexual behavior
IV. Progesterone stimulates the formation of alveoli in mammary glands
Select correct statements from above statements
1. I, II and III | 2. I, II and IV |
3. II, III and IV | 3. I, II, III and IV |
Trypsinogen is activated by
1. an enzyme enterogastrone
2. a hormone enterogastrone
3. an enzyme, enterokinase
4. a hormone, enterokinase
During pregnancy:
1. | All events of menstrual cycle stop and there is no menstruation |
2. | Events of menstrual cycle continue but there is no menstruation |
3. | Events of menstrual cycle continue but there is menstruation only in the first trimester |
4. | All events of menstrual cycle stop and there is menstruation only in the first trimester |
An ideal contraceptive should not:
1. Be user friendly
2. Be effective and reversible
3. Have the least side effects
4. Interfere with sexual drive
In human beings, the embryo heart is formed about after ________ of pregnancy.
1. | One month | 2. | Two months |
3. | First trimester | 4. | Second trimester |
One of the first regions of the human brain to suffer damage in Alzheimer’s disease is the:
1. Hypothalamus
2. Cerebrum
3. Hippocampus
4. Amygdala
The olfactory bulb can be regarded as the extension of:
1. Brain stem | 2. Limbic system |
3. Diencephalon | 4. Corpora quadrigemina |
In the nodal tissue of the human heart, the highest conduction velocity is seen in:
1. Internodal pathway | 2. AV node |
3. AV bundle or Bundle of His | 4. Purkinje fibers |
The peripheral chemoreceptors for regulation of respiration are located:
1. adjacent to the rhythm center
2. near arch of aorta and carotid artery
3. in the walls of trachea
4. in the walls of the alveoli
What acts as a check on the renin-angiotensin mechanism?
1. | ANF | 2. | ADH |
3. | Aldosterone | 4. | Erythropoietin |
Identify the incorrectly matched pair [assume normal physiological conditions]:
1. GFR – 125 ml/min
2. Amount of urea produced – 25 to 30 mg/day
3. Average urine output – 1 to 1.5 liter/day
4. Average amount of blood filtered by kidney – 1100 to 1200 ml/min
During muscle contraction, the event shown in the following diagram describes:
1. cross bridge detachment
2. the power stroke or working stroke
3. cross bridge formation
4. cocking of myosin head
Floridean starch has structure similiar to:
1. | Amylopectin and glycogen | 2. | Mannitol and algin |
3. | Laminarin and cellulose | 4. | Starch and cellulose |
Hormones stored and released from neurohypophysis are:-
1. Thyroid-stimulating hormone and Oxytocin
2. Oxytocin and Vasopressin
3. Follicle-stimulating hormone and leutinizing hormone
4. Prolactin and Vasopressin
Match the following columns with reference to cockroach and select the correct option :
Column I | Column II | ||
(a) | Grinding of the food particles | (i) | Hepatic caeca |
(b) | Secrete gastric juice | (ii) | 10th segment |
(c) | 10 pairs | (iii) | Proventriculus |
(d) | Anal cerci | (iv) | Spiracles |
(v) | Alary muscles |
(a) | (b) | (c) | (d) | |
1. | (iii) | (i) | (iv) | (ii) |
2. | (iv) | (iii) | (v) | (ii) |
3. | (i) | (iv) | (iii) | (ii) |
4. | (ii) | (iii) | (i) | (iv) |
Which of the following pesticides is an acetylcholinesterase inhibitor?
1. Aldrin
2. BHC
3. Endosulfan
4. Malathion
In humans, at the end of the first meiotic division, the male germ cells differentiate into
1. primary spermatocytes
2. secondary spermatocytes
3. spermatids
4. spermatogonia
The correct ascending order of percent composition of various components of a typical cell would be:
1. Protein – Carbohydrate – Lipids – Nucleic acids
2. Protein – Nucleic acids – Carbohydrate – Lipids
3. Carbohydrates – Protein – Nucleic acids– Lipids
4. Carbohydrates – Protein – Lipids – Nucleic acids
The most important feature in a plasmid to serve as a vector in gene cloning experiment is:
1. Origin of replication (ori)
2. Presence of a selectable marker
3. Presence of sites for restriction endonuclease
4. Its size
What is incorrect regarding innate immunity?
1. | It is present at the time of birth |
2. | Physiological barriers prevent microbial growth |
3. | Natural killers, a cellular barrier, are a type of monocyte |
4. | It is a non-specific type of defense |
Consider the following two statements:
I: | In spite of having more than 70 percent of the world's livestock population, the contribution of India and China to the world's farm produce is only 25 percent. |
II: | The productivity per unit of cattle in these countries is very low. |
1. Both I and II are true and II explains I
2. Both I and II are true but II does not explain I
3. I is true but II is false
4. Both statements are not true
Which of the following types of natural selection reduces variation but does not change the mean value?
1. | directional | 2. | stabilizing |
3. | disruptive | 4. | all of these |
“Organisms that share common descent show underlying embryological patterns on which they build later their adult patterns”. This is :
1. | Haeckel’s law | 2. | Baer’s law |
3. | Gauss law | 4. | Allen’s rule |
The genetic drift is also called as :
1. Sewall-wright effect
2. Hardy-Weinberg equilibrium
3. Balanced polymorphism
4. Gene flow
The secretory phase in the human menstrual cycle is also called?
1. Luteal phase and it lasts for about 13 days.
2. Follicular phase and it lasts for about 13 days.
3. Luteal phase and it lasts for about 6 days.
4. Follicular phase and it lasts for about 6 days.
All the following hormones are produced by anterior pituitary except:
1. Gonadotropins | 2. ACTH |
3. Prolactin | 4. Melatonin |
A vein, in general, can be distinguished from an artery by:
1. Absence of valves | 2. Thin tunica media |
3. Absence of tunica externa | 4. Absence of tunica media |
The joint between adjacent vertebrae in the vertebral column is a:
1. Fibrous joint | 2. Cartilaginous joint |
3. Gliding synovial joint | 4. Condyloid synovial joint |
The functions of the respiratory rhythm center can be moderated by a center located in:
1. Medulla oblongata | 2. Pons varoli |
3. Hypothalamus | 4. Cerebrum |
Flippers of Penguins and Dolphins are examples of:
1. Convergent evolution
2. Industrial melanism
3. Natural selection
4. Adaptive radiation