Water vapor comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options
1. Both processes cannot happen simultaneously
2. Both processes can happen together because the diffusion coefficient of water and CO2 is different
3. The above processes happen only during night time
4. One process occurs during day time, and the other at night
Refer section 11.1.1 of your NCERT. What peculiarity does NCERT mention regarding diffusion and solids ?
1. It does not occur in solids
2. It is more easily visualized in solids
3. It requires expenditure of external energy and occurs against concentration gradient
4. Diffusion in solids rather than of solids is more likely.
Leguminuous plants are able to fix atmoshpheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during this process of nitrogen fixation ?
1. Nodules act as sites for nitrogen fixation
2. The enzyme nitrogenasecatalyses the conversion of atmospheric N2 to NH3
3. Nitrogenase is insensitive to oxygen
4. Leghamoglobin scavenges oxygen and pinkish in color.
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
1. Increasing atmospheric concentration up to 0.05 % can enhance fixation rate
2. plants respond to higher temperatures with enhanced photosynthesis with plants have much lower temperature optimum.
3. Tomato is a greenhouse crop which can be grown in – enriched atmosphere for higher yield
4. Light saturation for fixation occurs at 10% of full sunlight
The 2-carbon compound formed in photorespiration is:
1. Acetyl CoA
3. Acetic acid
Which one is correct sequence occuring in glycolysis?
1. G-6-P →PEP →3-PGAL →3-PGA
2. G-6-P →3-PGAL → 3-PGA →PEP
3. G-6-P →PEP →3-PGA →3-PGAL
4. G-6-P →3-PGA →3-PGAL →PEP
The number of ATP molecules produced when pyruvate is converted to lactate by fermentation?
If in a pond there are 20 lotus plants last year and through reproduction 4 new lotus plants are added, the number of offspring per lotus per year would be:
Which of the following statements is correct? (NCERT Exemplar)
1. Parthenium is an endemic species of our country.
2. African catfish is not a threat to indigenous catfishes.
3. Steller’s sea cow is an extinct animal
4. Lantana is popularly known as carrot grass.
What parameters are used for the tiger census in our country’s national parks and sanctuaries?
1. Pug marks only
2. Pugmarks and fecal pellets
3. Faecal pellets only
4. Actual headcounts
Select the wrong statement.
1. Diatoms are microscopic and float passively in water.
2. The walls of diatoms are easily destructible.
3. ‘Diatomaceous earth’ is formed by the cell walls of diatoms.
4. Diatoms are chief producers in the oceans.
If the fruit is formed without the fertilization of ovary, it is called as:
During anaphase I of meiosis
1. Homologous chromosomes separate
2. Non-homologous auto some separate
3. Sister chromatids separate
4. Non-sister chromatids separate
The number seed of plants such as gram and peas, possess no endosperm, because
1. These plants are not angiosperms
2. There is no double fertilization in them
3. Endosperm is not formed in them
4. Endosperm gets used up by the developing embryo during seed development
Phellogen and Phellem respectively denote
1. Cork and cork cambium
2. Cork cambium and cork
3. Secondary cortex and cork
4. Cork and secondary cortex
Methanogens are commonly present in:
1. Alimentary canal of the lower invertebrates
2. Symbiotic relationships with xerophytic plants
3. Gut of ruminant animals
4. Close associations with corals
In gymnosperms the ovules are:
1. not enclosed by any ovary wall before and after fertilization
2. not enclosed by any ovary wall only before fertilization
3. not enclosed by any ovary wall only after fertilization
4. enclosed by an ovary wall before and after fertilization
The main difference between taxonomy and systematic is that:
1. Taxonomy is involved in the naming and classification of organisms while systematics is involved in determining evolutionary relationship between organisms
2. Systematics is involved in the naming and classification of organisms while taxonomy is involved in determining evolutionary relationship between organisms
3. Taxonomy is not a true science and has largely been replaced with systematic
4. Systematics can be considered as a part of taxonomy
Modern detergents contain enzyme preparations of
Which of the following most appropriately describes haemophilia?
1. Dominant gene disorder
2. Recessive gene disorder
3. X-linked recessive gene disorder
4. Chromosomal disorder
Which one of the following statements is wrong?
1. When pollen is shed at two-celled stage, double fertilization does not take place.
2. Vegetative cell is larger than generative cell.
3. Pollen grains in some plants remain viable for months.
4. Intine is made up of cellulose and pectin.
Which one of the following pairs of codons is correctly matched with their function or the signal for the
particular amino acid ?
1. AUG, ACG – start/methionine
2. UUA, UCA – Leucine
3. GUU – Alanine
4. UAG, UGA – stop
The expression of only one of the parental characters in a monohybrid cross in the F1, the expression of both in the F2and the proportion of 3:1 obtained at the F2 can be explained by:
1. Law of Dominance
2. Law of segregation
3. Law if Independent Assortment
4. Two factor interaction
The lac operon is regarded as:
1. Negative, Inducible
2. Negative, Repressible
3. Positive, Inducible
4. Positive, Repressible
Consider the following statements regarding floral primordium:
I. It is formed at the shoot apical meristem
II. Development of flower is dependent on genetics, PGR and environmental conditions.
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.
In over 60 % of angiosperms, pollen grains are shed at:
1. 2 celled stage
2. 3 celled stage
3. 4 celled stage
4. 1 celled stage
What decides the frequency of an allele in a population?
2. Its location on a particular chromosome
3. Its degree of expression
4. Natural selection
In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called:
The major problem with the use of chemicals to control plant diseases and pests is:
1. High cost
2. Ineffectivity against most pathogens
3. Difficulty in production
4. Non specific nature
Consider the following key events:
I. Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements.
II. Nucleolus, golgi complex and ER reform
The stage of mitosis characterized by these key events is:
An important site of the formation of glycoproteins and glycolipids in a eukaryotic cell is the:
1. Rough endoplasmic reticulum
2. Smooth endoplasmic reticulum
3. Golgi apparatus
Which of the following pair of organelles does not contain DNA?
1. Nuclear envelope and Mitochondria
2. Mitochondria and Lysosomes
3. Chloroplast and Vacuoles
4. Lysosomes and vacuoles
Some dividing cells exit the cell cycle and enter the vegetative inactive stage. This is called the quiescent stage . This process occurs at the end of:
2. S phase
4. M phase
E.coli has only 4.6 × base pairs and completes the process of replication within 18 minutes; then the average rate of polymerization is approximate-
(1) 2000 base pairs/second
(2) 3000 base pairs/second
(3) 4000 base pairs/second
(4) 1000 base pairs/second
Match the following concerning the activity/function and the phytohormone involved :-
(a) Fruit ripener (i) Abscisic acid
(b) Herbicide (ii) GA 3
(c) Bolting agent (iii) 2, 4-D
(d) Stress hormone (iv) Ethephon
Select the correct option from following :-
(1) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
(2) (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
(3) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
(4) (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
Phosphoenol pyruvate (PEP) is the primary acceptor in
4. and -plants
Climax community is in a state of (NCERT Exemplar):
4. Constant change
Which one is odd combination of habitat and particular animal
1. Sunderbans– Bengal Tiger
3. Rann of Kutch–Wild Ass
4. Dachingam National Park – Snow Leopard
Identify the correctly matched pair
1. Basel convention - Biodiversity conservation
2. Kyoto protocol - Climate change
3. Montreal protocol - Global warming
4. Ramsar convention - Ground water pollution
Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into: (NCERT Exemplar)
1. Carbon dioxide and water
2. Carbon monoxide
4. Carbon dioxide and methane
Which one of the following structure is an organelle within an organelle ?
The phase of the cell cycle that lasts for least time is the:
1. G1 phase
2. S phase
3. G2 phase
4. M phase
Which one of the following alcoholic drinks is produced without distillation?
Meiosis occurs in
One of the genes present exclusively on the X-chromosome in humans is concerned with
2. Red-green color blindness
3. Facial hair/moustaches in males
4. Night blindness
A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type offers blood donation without delay. What would have been the type of blood group of the donor friend?
1. Type B
2. Type AB
3. Type O
4. Type A
Which one of the following in & generates new genetic combinations leading to variation?
1. Nucellar polyembryony
2. Vegetative reproduction
4. Sexual reproduction
In Avery, Macleod and McCarty experiment, the transformation of bacteria was inhibited by:
4. None of these
What radioactive isotope was use by Meselson and Stahl to label DNA in their experiment?
Arrange the following steps of a plant breeding program in a correct chronological manner:
I. Selection and testing of superior recombinants
II. Collection of variability
III. Cross hybridisation among the selected parents
IV. Evaluation and selection of parents
V. Testing, release and commercialisation of new cultivars
1. II, IV, I, III, V
2. IV, I, II, III, V
3. II. IV, III, I, V
4. IV, III, II, I, V
Injury to adrenal cortex is not likely to affect the secretion of which one of the following ?
2. Both androstenedione and dehydroepiandrosterone
Which of the following layers in an antral follicle is acellular?
2. Theca interna
4. Zona pellucida
Which one of the following animals is correctly matched with its particular named taxonomic category?
1. Tiger - tigris, the species
2. Cuttlefish - Mollusca, a class
3. Humans - Primata, the family
4. Housefly - Musca an order
Ascaris is characterized by:
1. Presence of true coelom but absence of metamerism
2. Presence of true coelom and of metamerism
3. Absence of true coelom but presence of metamerism
4. Presence of neither true coelom nor metamerism
Identify the incorrectly matched pair:
Water vascular system
Closed circulatory system
In male cockroaches the genital pouch is bounded by:
1. 9th and 10th terga dorsally and 10th sternum ventrally
2. 9th tergum dorsally and 9th and 10th sterna ventrally
3. 9th and 10th terga dorsally and 9th sternum ventrally
4. 9th and 10th terga dorsally and 9th and 10th sterna ventrally
Which one of the following is a pair of viral diseases?
1. Ringworm, AIDS
2. Common Cold, AIDS
3. Dysentery, common cold
4. Typhoid, Tuberculosis
A transgenic food crop which may help in solving the problem of night blindness in developing countries is
1. Bt Soyabean
2. Golden Rice
3. Flavr Savr Tomatoes
4. Starlink Maize
Agarose extracted from sea weeds finds use in
2. Tissue Culture
4. Gel electrophoresis
Methanol is converted to formaldehyde in our body. It inhibits mitochondrial cytochrome c oxidase. It also causes blindness. The treatment of methanol toxicity is :
2. L - Dopa
Restriction endonucleases present in bacterial cells provide advantage to the cell because these enzymes:
1.can identify the mutated sequences on the chromosomal DNA and help in their repair
2.selectively bind to particular nucleotide sequences that may appear in viral DNA preventing its replication in the cell
3.can cut the plasmid DNA of the bacterial cell that allows them to recombine foreign DNA into their plasmid DNA
4.help the bacterium take up foreign DNA from their environment and combine it into their genome
The work of which of the following scientists led to the establishment of the discipline of modern biotechnology?
1. Banting and Best
2. Bolivar and Rodriguez
3. Hershey and Chase
4. Cohen and Boyer
The ion required as the co-factor for the proteolytic enzyme, carboxypeptidase, is:
Which of the following structures or regions is incorrectly paired with its function?
1. Hypothalamus- Production of releasing hormones and regulation of temperatures, hunger and thirst.
2. Limbic system-Consists of fibre tracts that interconnect different regions of brain;controls movement.
3. Medulla oblongata-Controls respiration and cardiovascular reflexes.
4. Corpus callosum-Band of fibres connecting left and right cerebral hemispheres.
Out of ‘X’ pairs of ribs in humans only ‘Y’ pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation
1. X = 12, Y = 15 True ribs are attached dorsally to vertebral column and sternum on the two ends
2. X = 24, Y = 7 True ribs are dorsally attached to vertebral column but are free on ventral side
3. X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side
4. X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum
Identify the incorrectly matched pair:
1. Conn’s disease: Hyperaldosteronism
2. Addison’s disease: Hypoadrenalism
3. Osteitisfibrosacystica: Hypoprathyroidism
4. Hashimoto’s disease: Hypothyroidism
The cavity of a tertiary follicle is called as:
3. Vitelline space
Which of the following is not a factor that has led to population explosion in India?
1. Decline in death rate
2. Decline in maternal mortality rate
3. Decline in Infant mortality rate
4. Decline in number of people in reproducible age
The milk produced during the initial few days of lactation, called colostrum, is essential for the new born as colostrums contains:
1. Large amount of glucose
2. Anti-infective antibodies
4. Various hormones
Mental depression psychosis, affecting millions, may be basically caused by the diminished formation in the brain of:
Identify the correct match:
Point of highest visual acquity
Visual cortex in cerebrum
Light and dark adaptation
Lacks any rods and cones
Exchange of nutrients and gases between the blood and the cells always occur:
1. by active transport
2. with the help of transport carrier proteins
3. at the arterial end of the capillary network
4. through the interstitial fluid
Which of the following has the highest affinity for oxygen?
Extension of renal cortex between the medullary pyramids is called as:
1. Juxta-glomerular apparatus
2. Macula densa
3. Columns of Bertini
4. Ducts of Bellini
The proximal convoluted tubule of the nephron is lined by:
1. simple ciliated cuboidal epithelium
2. simple ciliated columnar epithelium
3. compound cuboidal brush bordered epithelium
4. simple cuboidal brush bordered epithelium
The total number of vertebrosternal and vertebrochondral ribs in human body respectively are:
1. 7 and 3
2. 14 and 6
3. 3 and 7
4. 6 and 14
Identify the incorrect comparison of Kwashiorkor and Marasmus:
Protein deficiency with adequate energy intake
Inadequate energy intake in all forms, including protein
Increases after 18 months
Prior to age 1
Main clinical sign
Muscular wasting and loss of subcutaneous fat
Edema and ascites [abnormal buildup of fluid in the abdomen]
Fatty infiltration in liver
Match the following:
Inhibitor of catalytic activity
Possess peptide bonds
Cell wall material in fungi
Choose the correct option from the following:
Match the follwing columns and select the correct option.
(a) Pituitary gland (i) Grave's disease
(b) Thyroid gland (ii) Diabetes mellitus
(c) Adrenal gland (iii) Diabetes insipidus
(d) Pancreas (iv) Addison's diseae
a b c d
(1) (iii) (ii) (i) (iv)
(2) (iii) (i) (iv) (ii)
(3) (ii) (i) (iv) (iii)
(4) (iv) (iii) (i) (ii)
Progestogens alone or in combination with estrogens can be used as a contraceptive in the form of -
(1) Implants only
(2) Injections only
(3) Pills, injections and implants
(4) Pills only
In cockroach, identify the parts of the foregut in correct sequence:-
(1) Mouth Oesophagus Pharynx Crop Gizzard
(2) Mouth Crop Pharynx Oesophagus Gizzard
(3) Mouth Gizzard Crop Pharynx Oesophagus
(4) Mouth Pharynx Oesophagus Crop Gizzard
Which of the following conditions cause erythroblastosis fetal?
(1) Mother and fetus
(2) Mother and fetus
(3) Both mother and fetus
(4) Both mother and fetus
Match the following columns and select the correct option :
Column - I Column - II
(a) Pneumotaxic (i) Alveoli Centre
(b) Dissociation (ii) Pons region of curve brain
(c) Carbonic (iii) Haemoglobin Anhydrase
(d) Primary site (iv) R.B.C. of exchange of gases
(1) (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
(2) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
(3) (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
(4) (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
Select the correct statement :
(1) Atrial Natriuretic Factor increases the blood pressure.
(2) Angiotensin II is a powerful vasodilator.
(3) Counter current pattern of blood flow is not observed in vasa recta.
(4) Reduction in Glomerular Filtration Rate activates JG cells to release renin.
The proteolytic enzyme rennin is found in :
(1) Intestinal juice
(2) Bile juice
(3) Gastric juice
(4) Pancreatic juice
Bipolar neurons are found in humans in :
1. Brain 2. Spinal cord
3. Embryonic stages 4. Olfactory epithelium
Which one of the following statement is incorrect about menstruation?
1. During normal menstruation about 40 mL blood is lost
2. The menstrual fluid can easily clot
3. At menopause in the female, there is especially abrupt increase in gonadotropic hormones
4. The beginning of the cycle of menstruation is called menarche
The metal ion that acts as a cofactor for both
alcohol dehydrogenase and carbonic anhydrase
Which of the following contributed in popularising the PCR (polymerase chain reactions) technique?
1. Easy availability of DNA template
2. Availability of synthetic primers
3. Availability of cheap deoxyribonucleotides
4. Availability of 'Thermostable' DNA polymerase
Anamnestic response in acquired immunity is due to the fact that it:
1. is characterized by memory
2. is pathogen specific
3. is huge in magnitude
4. is due to lymphocytes
The management of animals for milk and its products for human consumption is called as:
1. Animal breeding
4. Animal husbandry
An island population faced a natural calamity and the population crashed to only30 organisms. After some time the number of organisms grew to 5000 but still the threat of extinction is large. This is most likely due to:
1. Founder effect
2. Bottleneck effect
3. Edge effect
The control apparatus of the Urey and Miller experiment was devoid of :
1. a provision for evaporation
2. an arrangement for circulation
3.a source of energy
4. an arrangement for condensation
U238, the radioactive isotope of uranium, is very useful in absolute dating of rocks. It’s half life is about:
1. 4500 years
2. 4.5 million years
3. 45 million years
4. 4.6 billion years
What is the correct sequence of sperm formation?
(1) Spermatid, Spermatocyte, Spermatogonia, Spermatozoa
(2) Spermatogonia, Spermatocyte, Spermatozoa, Spermatid
(3) Spermatogonia, Spermatozoa, Spermatocyte, Spermatid
(4) Spermatogonia, Spermatocyte, Spermatid, Spermatozoa
The definition of hormone describes them as having all the following features except:
1. non-nutrient chemicals
2. intra-cellular messengers
3. produced in trace amounts
4. act on distant target organs
Both heart rate and stroke volume in a human get doubled during exercise. His cardiac output will get:
2. four times
3. eight times
4. remain same
A motor neuron along with all the muscle fibers innervated by it constitute a:
2. Motor end plate
3. Motor unit
4. Myoneural junction
The value of which of the following is normally the highest in normal physiological conditions?
1. Residual volume
2. Expiratory reserve volume
3. Functional residual capacity
4. Inspiratory reserve volume
Match the hominids with their correct brain size:
(a) Homo habilis (i) 900 cc
(b) Homo neanderthalensis (ii) 1250 cc
(c) Homo erectus (iii) 650-800 cc
(d) Homo sapiens (iv) 1400 cc
Select the correct option.
(a) (b) (c) (d)
1. (iv) (iii) (i) (ii)
2. (iv) (i) (iv) (ii)
3. (iii) (ii) (i) (iv)
4. (iii) (iv) (i) (ii)