When a plant undergoes senescence, the nutrients may be
4. None of the above
Section 13.10.1 NCERT states that except for plants in shade or in dense forests, light is rarely a limiting factor in nature. This is because:
1. Dark reactions do not depend on light
2. The rate of photosynthesis can be increased by higher carbon dioxide and lower temperatures even in low light conditions
3. Light saturation occurs at 10 % of full sunlight
4. Carbon fixation is independent of enzymes
The correct descending order of the RQ value, when carbohydrates, proteins and fats are used as respiratory substrate would be:
1. Protein ˃ Fats ˃ Carbohydrates
2. Protein ˃ Carbohydrates ˃ Fats
3. Carbohydrates ˃ Protein ˃ Fats
4. Fats ˃ Carbohydrates ˃ Protein
If a new habitat is just being colonized, which of the following is most likely to contribute to an increase in the population density?
1. Birth rate
2. Death rate
The active chemical drug reserpine is obtained from: (NCERT Exemplar)
In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using the exponential equation, the number of people present in 2015 is predicted as:
1. 25 million
2. 17 million
3. 20 million
4. 18 million
Which of the following are found in extreme saline conditions?
Underground stems of potato, ginger, turmeric, zamikand and Colocasia:
I. Store food in them
II. Act as organs of perennation
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Cells which are not dividing are likely to be at
4. S phase
Endosperm, a product of double fertilization in angiosperms is absent in the seeds of
A piece of wood having no vessels (trachea) must be belong to
Which of the following is not a feature of members of Kingdom Fungi?
1. Eukaryotic cell type
2. Chitinous cell wall
3. Organ system body organization
4. Hetetrotrophic mode of nutrition
Which of the following is not a green alga?
Pantheratigris belongs to the Felidae family. What taxonomic category does Panthera represent?
Which one of the following pairs is wrongly matched?
(1) Textile - amylase
(2) Detergents - lipase
(3) Alcohol - nitrogenase
(4) Fruit juice - pectinase
Which one from those given below are the periods for Mendel's hybridization experiments?
1. 1856 - 1863
2. 1840 - 1850
3. 1857 - 1869
4. 1870 – 1877
Perisperm differs from endosperm in
1. having no reserve food
2. being a diploid tissue
3. its formation by fusion of secondary nucleus with several sperms
4. being a haploid tissue
Removal of introns and joining of exons in a defined order during transcription is called:
On self-pollinated a tall F2 plant, the progeny can be:
1. Tall only
2. Dwarf only
3. Intermediate in height
4. Tall and Dwarf
In angiosperms, the mature female gametophyte is represented by:
Transfer of pollens from the anther to the stigma of the same flower is called as:
A certain gene has 5 alleles. What will be the number of possible genotypic combinations?
Identifying all the genes in the genome that are transcribed into RNA is called as:
1. Expressed Sequence Tag
2. Sequence Annotation
3. Inverse PCR
The RNA polymerase holoenzyme transcribes:
1. the promoter, structural gene and the terminator region
2. the promoter and the terminator region
3. the structural gene and the terminator region
4. the structural gene only.
1. Species specific; Broad spectrum insecticides
2. Generalized; Broad spectrum insecticides
3. Species specific; Narrow spectrum insecticides
4. Generalized; Narrow spectrum insecticides
Consider the following two statements:
I. Plant cells undergo cytokinesis in a different manner than the animal cells
II. Plant cells are enclosed by a relatively inextensible cell wall.
Of the two statements:
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 correct but II is incorrect
4. I is incorrect but II is correct
The living state of an organism is a :
1. non-equlibrium steady state
2. non-equilibrium variable state
3. steady state in perfect equlibrium
4. variable state in perfect quilibrium
Which of the following statements regarding mitochondria is incorrect ?
1. Mitochondrial matrix contains single circular DNA molecule and ribosomes
2. Outer membranes is permeable to monomers of carbohydrates, fats and proteins
3. Enzymes of electron transport are embedded in outer membrane
4. Inner membrane is convoluted with infoldings
What is the direction of movement of sugars in phloem?
Dissolution of the synaptonemal complex occurs during :
Which of the following is not an inhibitory substance governing seed dormancy?
1. Abscisic acid
2. Phenolic acid
3. Para-ascorbic acid
4. Gibberellic acid
Which of the following statements is correct?
1. Adenine pairs with thymine through one H-bond
2. Adenine pairs with thymine through three H-bonds
3. Adenine does not pair with thymine
4. Adenine pairs with thymine through two H-bonds
Which of the following statements is incorrect?
(1) RuBisCO is a bifunctional enzyme
(2) In C4 plants, the site of RuBisCO activity is mesophyll cell
(3) The substrate molecule for RuBisCO activity is a 5-carbon compound
(4) RuBisCO action requires ATP and NADPH
In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:
Pyruvate dehydrogenase activity during aerobic respiration requires :-
Facilitated diffusion allows cells to:
1. achieve uphill transport without ATP energy
2. select substances for uptake
3. stop transport of hydrophilic substances
4. decrease the rate of diffusion of lipophilic substances
The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possiblereason for these changes is that
1. both plant populations in this habitat decreased.
2. population B competed more successfully for food than population A.
3. population A produced more offspring than population B.
4. population A consumed the members of population B.
If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be(NCERT Exemplar)
2. Tertiary producer
3. Tertiary consumer
4. Secondary consumer
Which one of the following is not observed in biodiversity hotspots
1. Lesser interspecific competition
2. Species richness
4. Accelerated species loss
Montreal protocol which calls for appropriate action to protect the ozone layer from human activitieswas passed in year
Which one of the following diseases is not caused due to contamination of water? (NCERT Exemplar)
A major site for synthesis of lipids is
Growth and reproduction are:
1. characteristics of cells and living things
2. defining properties of cells and living things
3. characteristics of cells but not of living things
4. defining properties of cells but not of living things
Which one of the following in & generates new genetic combinations leading to variation?
1. Nucellar polyembryony
2. Vegetative reproduction
4. Sexual reproduction
A normal woman whose father was colour blind is married to normal visioned man. Their sons would be
1. 75% colour blind
2. 50% colour blind
3. 100% colour blind
4. All normal.
Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?
2. Sickle cell anaemia
Pollination in water hyacinth and water lily is brought about by the agency of
3. insects or wind
Which of the following is also called as the soluble RNA?
Which of the following would be nucleoside found only in RNA?
PusaSem 2, a variety of flat bean, is resistant to all the following pests except:
3. Fruit borer
Toxic agents present in food which interfere with thyroxin synthesis lead to the development of
1. toxic goitre
3. simple goitre
The shared terminal duct of the reproductive and urinary system in the human male is
3. Vas deferens
4. Vasa efferentia
Which one of the following categories of animals, is correctly described with no single exception in it ?
1. All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal)
2. All bony fishes have four pairs of gills and an operculum on each side.
3. All sponges are marine and have collared cells.
4. All mammals are viviparous and possess diaphragm for breathing
Which of the following is not a feature of Porifera?
1. Exclusively marine animals
2. Presence of a water transport or a canal system
3. Sexes are not separate
4. Internal fertilization and indirect development
The animals belonging to all the following groups are exclusively marine except:
Mosaic vision in Periplaneta is characterized by:
1. High sensitivity but low resolution
2. Low sensitivity but high resolution
3. High sensitivity and high resolution
4. Low sensitivity and low resolution
Use of anti-histamines and steroids give a quick relief from
Transgenic plants are the ones
1. Grown in artificial medium after hybridization in the field
2. Produced by a somatic embryo in artificial medium
3. Generated by introducing foreign DNA in to a cell and generating a plant from that cell
4. Produced after protoplast fusion in artificial medium
Which one is a true statement regarding DNA polymerase used in PCR
1. It is used to ligate introduced DNA in recipient cell
2. It serves as a selectable marker
3. It is isolated from a virus
4. It remains active at high temperature
HIV selectively infects and destroys :
1. CD4 T Lymphocytes
2. CD8 T Lymphocytes
3. T-Suppressor cells
A direct target for gene therapy would include all the following cells except:
2. muscle fibers
4. vascular endothelium
What controls the copy number of linked DNA if plasmid is used as a vector in bacterial transformation?
3. Selectable markers
4. Promoter in the insert
Consider the following enzymes:
Which of these enzymes require haem as a cofactor for their activity?
1. I only
2. I and II only
3. II and III only
4. I, II and III
Which anterior pituitary hormone is predominantly under inhibitory control?
2. Growth hormone
What happens when a sperm enters the cytoplasm of the secondary oocyte?
1. Release of first polar body
2. Completion of meiosis II
3. Degeneration of polar bodies
4. Dissolution of zona pellucida
The statutory marriageable age in India for males and females respectively are:
1. 21, 18
2. 18, 21
3. 18, 18
4. 21, 21
The fetal body is covered with fine hair, eyelashes separate, and eyelashes are formed by the end of:
1. 20 weeks
2. 24 weeks
3. 28 weeks
4. 30 weeks
The scalavestibuli and scala tympani contain perilymph and are connected at the:
1. cochlear duct
3. semicircular duct
Photopigments in the human eye are composed of:
1. a lipid and an ester of vitamin A
2. a protein and an ester of vitamin A
3. a lipid and an aldehyde of vitamin A
4. a proteins and aldehyde of vitamin A
The SA node is called as the normal pacemaker of the human heart because:
1. it is the only muscle in the nodal tissue and human heart is myogenic
2. it is the remnant of the sinus venosus
3. it is located in the right atrium, and atria must contract before ventricles
4. it generates impulse at maximum rate in the nodal tissue
It is necessary that lungs must be present in anatomically air-tight chamber because:
1. we cannot directly alter the pulmonary volume
2. our lungs are not made of any elastic tissue
3. the pleural cavity always has a positive pressure with respect to pulmonary pressure
4. the partial pressure of oxygen in atmosphere is less than that in the alveoli
The dialyzing fluid has same composition as that of plasma except:
1. Nitrogenous wastes
The increasing gradient of osmolarity in medullary interstitium, during concentration of urine, is mainly caused by reabsortion of:
1. NaCl from ascending limb of loop of Henle and of urea by collecting duct
2. NaCl from descending limb of loop of Henle and of urea by collecting duct
3. NaCl from ascending limb of loop of Henle and of urea by PCT
4. NaCl from descending limb of loop of Henle and of urea by PCT
An example of a fibrous joint ‘gomphosis’ in human body is:
The ion, critical in absorption of nutrients like amino acids and glucose in the human alimentary canal, is:
Match the following hormones with the respective disease:
(a) Insulin (i) Addison's disease
(b) Thyroxin (ii) Diabetes insipidus
(c) Corticoids (iii) Acromegaly
(d) Growth Hormone (iv) Goitre
(v) Diabetes mellitus
Select the correct option.
(a) (b) (c) (d)
1. (ii) (iv) (i) (iii)
2. (v) (i) (ii) (iii)
3. (ii) (iv) (iii) (i)
4. (v) (iv) (i) (iii)
Select the hormone-releasing Intra-Uterine Devices.
1. Lippes Loop, Multitoad 375
2. Vaults, LNG-20
3. Multiload 375, Progestasert
4. Progestasert, LNG-20
Concanavalin A is:
1. a pigment
2. an alkaloid
3. an essential oil
4. a lectin
Match the following columns and select the correct option .
(1) Eosinophils (i) lmmune response
(2) Basophils (ii) Phagocytosis
(3) Neutrophils (iii) Release
(4) Lymphocytes (iv) Release granules
(1) (iv) (i) (ii) (iii)
(2) (i) (ii) (iv) (iii)
(3) (ii) (i) (iii) (iv)
(4) (iii) (iv) (iv) (i)
If the head of cockroach is removed, it may live for few days because:
1. The cockroach does not have nervous system
2. The head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body
3. The head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body
4. The supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.
Presence of which of the following conditions in urine are indicative of Diabetes Mellitus:
1. Uremia and Renal Calculi
2. Ketonuria and Glycosuria
3. Renal Calculi and Hyperglycaemia
4. Uremia and Ketonuria
The enzyme enterokinase helps in the conversion of
1. trypsinogen into trypsin
2. caseinogen into casein
3. pepsinogen into pepsin
4. protein into polypeptides
Identify the wrong statement with reference to transport of oxygen.
1. Partial pressure of CO2 can interfere with O2 binding with haemoglobin.
2. Higher H+ conc. in alveoli favours with formation of oxyhaemoglobin.
3. Low pCO2 in alveoli favours the formation of oxyhaemoglobin.
4. Binding of oxygen with haemoglobin is mainly related to partial pressure of O2.
Match the following columns and select the correct option.
(a) Floating Ribs (i) Located between second and seventh ribs
(b) Acromion (ii) Head of the Humerus
(c) Scapula (iii) Clavicle
(d) Glenoid cavity (iv) Do not connect with the sternum
(a) (b) (c) (d)
(1) (i) (iii) (ii) (iv)
(2) (iii) (ii) (iv) (i)
(3) (iv) (iii) (i) (ii)
(4) (ii) (iv) (i) (iii)
Match the following columns and select the correct option
Column - I Column - II
(a) The organ of Corti (i) Connects the middle ear and pharynx
(b) Cochlea (ii) Coiled part of the labyrinth
(c) Eustachian tube (iii) Attached to the oval window
(d) Stapes (iv)Located on the basilar membrane
(a) (b) (c) (d)
1. (iii) (i) (iv) (ii)
2. (iv) (ii) (i) (iii)
3. (i) (ii) (iv) (iii)
4. (ii) (iii) (i) (iv)
Withdrawal of which of the following hormones is the immediate cause of menstruation ?
All the following assumptions apply to
Michaelis-Menten kinetic analyses of enzyme
1. the total enzyme concentration studied at each
substrate concentration is fixed in analysis of
2. formation of enzyme-substrate complex does
not appreciably decrease the concentration of
3. Km decreases with competitive inhibition.
4. maximal velocity is reached when the enzymesubstrate complex is equal to the total
concentration of enzyme present.
The role of DNA ligase in the construction of a recombinant DNA molecule is:
1. Formation of phosphodiester bond between two DNA fragments
2. Formation of hydrogen bonds between sticky ends of DNA fragments
3. Ligation of all purime and pyrimidine bases
4. None of the above
Jurassic period of the Mesozoic era is characterized by
1. Gymnosperms are dominant plants and first birds appears.
2. Radiation of reptiles and origin of mammal like reptiles.
3. Dinosaurs become extinct and angiosperms appears.
4. Flowering plants and first dinosaurs appear.
In an antibody molecule, an antigen binding site is located:
1. In the constant portion
2. At the C – terminus of heavy chain
3. Between a light and a heavy chain
4. Between two heavy chains
Which of the following is the most important factor that would lead to increased milk yield
1. Selection of good breeds
2. Resistance to diseases
3. Stringent cleanliness and hygiene
4. Provision of ideal environmental conditions to cattle
A mutation appears in a sub-population of organisms separated from the other group by in the same large geographical area. This mutation can spread to the other subgroup by:
2.mutations in the gene pool of the other subgroup
3. mutation pressures
The fossils of Homo erectus were discovered in _____ and it existed about ____ mya.
1. Tanzania; 2
2. Java; 1.5
3. Ethiopia; 1.5
4. Australia; 2
The term “Homologous “ to mean the organs of different species that are related to each other through common descent, although now functionally different, was coined by :
1. Richard Owen
2. Erasmus Darwin
3. Ernst Haeckel
4. John Ray
Changes in GnRH pulse frequency in females is controlled by circulating levels of
(1) Estrogen and progesterone
(2) Estrogen and inhibin
(3) Progesterone only
(4) Progesterone and inhibin
The releasing hormones and inhibitory hormones secreted by hypothalamus reach anterior pituitary by:
1. portal circulation
3. general circulation
The resting axonal membrane is:
1. impermeable to the flux of both sodium and potassium ions
2. freely permeable to the flux of both sodium and potassium ions
3. relatively more permeable to the flux of potassium and nearly impermeable to the flux of sodium ions
4. relatively more permeable to the flux of sodium and nearly impermeable to the flux of potassium ions
Identify the incorrectly matched pair:
1. Plasma protein – 6 to 8 %
2. Formed elements – 55% of the blood
3. Hemoglobin – 12 to 16 gm in 100 ml of blood
4. Platelets – 150000 to 350000 mm-3
A bone disorder especially seen in post-menopausal women would be:
1. Rheumatoid arthritis
3. Bone cancer
The oxy-hemoglobin dissociation curve shifts to the right in all the following conditions except:
1. Presence of 2,3-DPG
2. Increased temperature
3. Increased pH
4. Increased carbon dioxide