If turgor pressure becomes equal to the wall pressure, then
1. water leaves the cell
2. water enters the cell
3. no exchange of water takes place
4. solute goes from the cell into water
Refer section 11.3.1, NCERT where it is stated that most of the water flow in the roots occurs via the apoplast. Why is this so?
1. Endodermis has suberized casparian strips
2. Root cortex cell lack plasmodesmata
3. Cortical cells are loosely packed
4. Root cortex is poorly organized
The free-living, anaerobic nitrogen-fixer is
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter
Photosynthesis in plants is relatively less limited by atmospheric levels because
1. The primary fixation of is mediated via PEP carboxylase.
2. Effective pumping of into bundle sheath cells.
3. Four carbon acids are the primary initial fixation products.
4. RuBisCO in plants has higher affinity for
Identify the incorrect statement regarding the comparison of plants to the plants:
1. They tolerate higher temperatures
2. They show a response to high light intensities
3. They have a lower productivity of biomass
4. They lack photorespiration
How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to and yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 Kcal?
1. | Two | 2. | Thirty |
3. | Fifty-seven | 4. | One |
Ubiquinone receives reducing equivalents via:
I. Complex I | II. Complex II | III. Complex III |
1. | Only I | 2. | Only I and II |
3. | Only I and III | 4. | I, II and III |
In most situations, which PGR acts as an antagonist to GAs?
1. ABA | 2. Ethylene |
3. Cytokinin | 4. Giberrellin |
All the following are adaptations in desert plants to minimize water loss except:
1. Thick cuticle
2. photosynthesis
3. CAM pathway
4. Sunken stomata
What is common to the following plants: Nepenthes, Psilotum, Rauwolfia, and Aconitum?
1. All are ornamental plants
2. All are phylogenic link species
3. All are prone to over-exploitation
4. All are exclusively present in the Eastern Himalayas
Salt concentration (Salinity) of the sea measured in parts per thousand is:
1. 10-15
2. 30-70
3. 0-5
4. 30-35
Which one of the following statements is wrong?
1. Phycomycetes are also called algal fungi.
2. Cyanobacteria are also called blue-green algae.
3. Golden algae are also called desmids.
4. Eubacteria are also called false bacteria.
In meiosis crossing over is initiated at
1. Pachytene | 2. Leptotene |
3. Zygotene | 4. Diplotene |
Both stem tendrils and stem thorns:
1. help the plant to climb
2. develop from axillary buds
3. protect plants from browsing animals
4. can be used in vegetative propagation
The position of the ovary shown in the given diagram would be:
1. | Superior | 2. | Inferior |
3. | Half inferior | 4. | Double superior |
Crossing over or recombination can be defined as:
1. | exchange of segments between sister chromatids of homologous chromosomes |
2. | exchange of segments between non sister chromatids of homologous chromosomes |
3. | exchange of segments between sister chromatids of heterologous chromosomes |
4. | exchange of segments between non sister chromatids of heterologous chromosomes |
Match the following and choose the correct option from below
A |
Cuticle |
i. |
Guard cells |
B |
Bulliform cells |
ii. |
Single layer |
C |
Stomata |
iii. |
Waxy layer |
D |
Epidermis |
iv. |
Empty colourless cell |
Options:
1. |
A-iii |
B-iv |
C-i |
D-ii |
2. |
A-i |
B-ii |
C-iii |
D-iv |
3. |
A-iii |
B-ii |
C-iv |
D-i |
4. |
A-iii |
B-ii |
C-i |
D-iv |
Which of the following is not a feature of the members of the class Basidiomycetes?
1. Branched and septate mycelium
2. Asexual spores are generally not formed
3. Vegetative reproduction not seen
4. Dikaryon stage commonly seen
Consider the following statements regarding green algae:
I. Pigments are located in definite plastids
II. Most have pyrenoids in chloroplasts
III. Cell wall has an inner layer of pectose and outer layer of cellulose
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Identify the incorrect statement amongst the following:
1. A multi cellular organism grows by cell division
2. In plants, growth by cell division occurs continuously throughout their life span
3. Cell division is not seen in animals after a certain age
4. Growth is a characteristic of living organisms
Which one of the following pairs is not correctly matched?
1. Serratia - Drug addiction
2. Spirulina - Single cell protein
3. Rhizobium - Biofertilizer
4. Streptomyces - Antibiotic
In his classic experiments on pea plants, Mendel did not use
1. Pod length
2. Seed shape
3. Flower position
4. Seed colour
In which one of the following pollination is autogamous
1. Geitonogamy
2. Xenogamy
3. Chasmogamy
4. Cleistogamy
Amino acid sequence in protein synthesis is determined by sequence of
1. rRNA
2. tRNA
3. mRNA
4. cDNA.
During DNA replication, Okazaki fragments are used to elongate the :
1. leading strand towards the replication fork
2. lagging strand towards the replication fork
3. leading strand away from the replication fork
4. lagging strand away from the replication fork
In cases of Phenylketonuria:
1. | The affected individual lacks an enzyme that converts the amino acid tyrosine into phenylalanine. |
2. | The affected individual makes an enzyme that converts the amino acid tyrosine into phenylalanine. |
3. | The affected individual makes an enzyme that converts the amino acid phenylalanine into tyrosine. |
4. | The affected individual lacks an enzyme that converts the amino acid phenylalanine into tyrosine. |
Which of the following is not a part of lac operon?
1. Operator
2. lacI
3. Promoter
4. lac Z
How many cells of the female gametophyte are surrounded by a cell wall and are organized into cells?
1. | 6 | 2. | 7 |
3. | 8 | 4. | 2 |
The only type of pollination which during pollination brings a genetically different type of pollen grains to the stigma is:
1. | Chasmogamy | 2. | Cleistogamy |
3. | Geitonogamy | 4. | Xenogamy |
Two garden pea dihybrids with round seed shapes and yellow seed color [RrYy] are intercrossed. Assuming independent assortment, the gene for seed shape is inherited by the progeny in a phenotypic ratio of:
1. | 3: 1 | 2. | 1: 1 |
3. | 9:3:3:1 | 4. | 1:1:1:1 |
What radioactive isotope was used in Meselson and Stahl experiment to prove the semi-conservative mode of DNA replication?
1. | 35S | 2. | 32P |
3. | 15N | 4. | None |
“Clearing” of fruit juices in industrial preparations is achieved by the action of enzyme:
1. | Papain | 2. | Lysozyme |
3. | Pectinase | 4. | Lipase |
Organisms prefer sexual mode of reproduction in adverse conditions because:
1. | It leads to a rapid proliferation of numbers |
2. | It requires two individuals that can support the progeny |
3. | It is less energy consuming than the asexual mode of reproduction |
4. | It provides protection and increases variations that may help progeny to survive |
Spindle fibers are attached to the chromosome in the region of:
1. | Centrosome | 2. | Chromomere |
3. | Chromonema | 4. | Kinetochore |
Match the following columns and select the correct option :
Column - I | Column - II | ||
(a) | Smooth endoplasmic reticulum | (i) | Protein synthesis |
(b) | Rough endoplasmic reticulum | (ii) | Lipid synthesis |
(c) | Golgi complex | (iii) | Glycosylation |
(d) | Centriole | (iv) | Spindle formation |
(a) | (b) | (c) | (d) | |
1. | (ii) | (i) | (iii) | (iv) |
2. | (iii) | (i) | (ii) | (iv) |
3. | (iv) | (ii) | (i) | (iii) |
4. | (i) | (ii) | (iii) | (iv) |
Praying mantis is a good example of
1. mullerianmimicary.
2. warning colouration.
3. social insect
4. camouflage.
Which of the following ecosystems is most productive in terms of net primary production?
1. | Deserts | 2. | Tropical rainforests |
3. | Oceans | 4. | Estuaries |
Choose the incorrect statement:
1. | The Montreal Protocol is associated with the control of the emission of ozone-depleting substances |
2. | Methane and carbon dioxide are greenhouse gases |
3. | Dobson units are used to measure the oxygen content of air |
4. | Use of incinerators is crucial to the disposal of hospital wastes |
Peptide synthesis inside a cell takes place in
1. Chloroplast
2. Mitochondria
3. Chromoplast
4. Ribosomes
The two asters together with spindle fibers form the:
1. Centrosome
2. Mitotic apparatus
3. Kinetochore
4. Chiasmata
Vegetative propagation in Mint occurs by
1. Sucker
2. Runner
3. Offset
4. Rhizome
Which one of the following traits of Garden Pea studied by Mendel was a recessive feature?
1. | Axial flower position | 2. | Green seeds colour |
3. | Green pod colour | 4. | Round seed shape. |
The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having:
1. | No anitgens A and B on RBCs |
2. | Other antigens besides A and B on RBCs |
3. | Overdominance of this type on the genes for A and B types |
4. | One antibody only - either anti-A or anti-B on the RBCs |
In angiosperms, microsporogenesis and megasporogenesis:
1. form gametes without further divisions
2. Involve meiosis
3. occur in ovule
4. occur in anther
At which position in the ribose is an additional –OH present [with respect to Deoxyribose]?
1. | 1’ | 2. | 2’ |
3. | 3’ | 4. | 5’ |
A transcription unit does not contain:
1. | Promoter | 2. | Operator |
3. | Structural gene | 4. | Terminator |
Consider the following two statements:
I: | An effective germplasm collection is the prerequisite of any successful plant breeding programme. |
II: | Genetic variability is the root of any breeding programme. |
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. I is false but II is true.
Western Ghats have a large number of plant and animal species that are not found anywhere else. Which of the following terms will you use to notify such species?
1. | Endemic | 2. | Vulnerable |
3. | Threatened | 4. | Keystone |
Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere?
1. Geneva protocol
2. Montreal protocol
3. Kyoto protocol
4. Gothenburg protocol
What is the fate of the male gametes discharged in the synergid?
1. | One fuses with the egg and the other fuses with central cell nuclei |
2. | One fuses with the egg and other(s) degenerate(s) in the synergid |
3. | All fuse with the egg |
4. | One fuses with the egg and other(s) fuse(s) with the synergid nucleus |
Identify the hormone with its correct matching of source and function.
1. Oxytocin-posterior pituitary, growth and maintenance of mammary glands
2. Melatonin-pineal gland, regulates the normal rhythm of sleep-wake cycle
3. Progesterone-corpus luteum, stimulation of growth and activities of female secondary sex organs
4. Atrial natriuretic factor-ventricular wall increases the blood pressure
Several hormones like hCG, hPL, oestrogen, and progesterone are produced by:
1. | ovary | 2. | placenta |
3. | fallopian tube | 4. | pituitary |
Which one of the following statements is incorrect?
1. The residual air in lungs slightly decreases the efficiency of respiration in mammals
2. The presence of non-respiratory air sacs increases the efficiency of respiration in birds
3. In insects, circulating body fluids serve to distribute oxygen to tissues
4. The principle of counter current flow facilitates efficient respiration in gills of fishes
Cellulose, the most important constituent of plant cell wall, is made of
1. | Unbranched chain of glucose molecules linked by α 1, 4 glycosidic bond |
2. | Branched chain of glucose molecules linked by β 1, 4 glycosidic bond in straight chain and β 1, 6 glycosidic bond at the site of branching |
3. | Unbranched chain of glucose molecules linked by β 1, 4 glycosidic bond |
4. | Branched chain of glucose molecules linked by α 1, 6 glycosidic bond at the site of branching |
Which of the following features is not present in the Phylum - Arthropoda?
1. | Jointed appendages | 2. | Chitinous exoskeleton |
3. | Metameric segmentation | 4. | Parapodia |
“Amniotes” do not include:
1. Amphibians
2. Reptiles
3. Birds
4. Mammals
Which type of tissue correctly matches with its location?
Tissue |
Location |
|
1. |
Cuboidal epithelium |
Lining of stomach |
2. |
Smooth muscle |
Wall of intestine |
3. |
Areolar tissue |
Tendons |
4. |
Transitional epithelium |
Tip of nose |
Identify the correct statement:
1. All pseudocoelomates are protostomes
2. All bilaterally symmetrical animals have a coelom
3. All animals have at least a tissue grade organization
4. All radially symmetrical animals are diploblastic
The moist surfaces of the buccal cavity, oesophagus and cornea are covered by:
1. Stratified squamous keratinized epithelium
2. Stratified squamous non keratinized epithelium
3. Transitional epithelium
4. Pseudostratified epithelium
Ti-plasmid is used for making transgenic plants. It is obtained from
1. Azotobacter
2. Agrobacterium
3. Rhizobium in leguminous root
4. Yeast
A drug that depresses brain activity and produces feeling of calmness, relaxation, and drowsiness, is :
1. | Morphine | 2. | Valium |
3. | Caffeine | 4. | LSD |
The first clinical gene therapy trial was given in 1990 to a 4 year girl with:
1. | Alpha – 1 antitrypsin deficiency |
2. | Cystic fibrosis |
3. | Adenosine deaminase deficiency |
4. | Chronic myeloid leukemia |
Which among the following is a cloning vector?
1. | EcoRI | 2. | BamHI |
3. | pUC18 | 4. | Sal I |
One of the constituents of the pancreatic juice while poured into the duodenum in humans is
1. Enterokinase
2. Trypsinogen
3. Chymotrypsin
4. Trypsin
The technique called gamete intrafallopian transfer (GIFT) is recommended for those females:
1. | who cannot provide a suitable environment for fertilisation. |
2. | who cannot produce an ovum. |
3. | who cannot retain the fetus inside the uterus. |
4. | whose cervical canal is too narrow to allow passage for the sperms. |
The amino acid tryptophan is the precursor for the synthesis of
1. Melatonin and serotonin
2. Thyroxine and triiodothyronine
3. Estrogen and progesterone
4. Cortisol and cortisone
Given below are four statements (a-d) regarding human blood circulatory system:
(a) | Arteries are thick-walled and have narrow lumen as compared to veins. |
(b) | Angina is acute chest pain when the blood circulation to the brain is reduced. |
(c) | Persons with blood group AB can donate blood to any person with any blood group under the ABO system. |
(d) | Calcium ions play a very important role in blood clotting. |
Which two of the above statements are correct?
1. (a) and (b) | 2. (b) and (c) |
3. (c) and (d) | 4. (a) and (d) |
Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (a-e) make it useful as a storage material?
(i). easily translocated
(ii). chemically non-reactive
(iii). easily digested by animals
(iv). osmotically inactive
(v). synthesized during photosynthesis
The useful properties are:
1. | (i), (ii) and (v) | 2. | (i) and (v) |
3. | (ii) and (iii) | 4. | (ii) and (iv) |
Select the answer with correct matching of the structure, its location and function.
Structure |
Location |
Function |
|
1. |
Cerebellum |
Midbrain |
Controls respiration and gastric secretions |
2. |
Hypothalamus |
Forebrain |
Controls body temperature, urge for eating and drinking |
3. |
Blind spot |
Near the place where optic nerve leaves the eye |
Rods and cones are present but inactive here |
4. |
Eustachian tube |
Anterior part of internal ear |
Equalizes air pressure on either side of tympanic membrane |
Select the correct statement with respect to locomotion in humans:
1. A decreased level of progesterone causes osteoporosis in old people
2. Accumulation of uric acid crystals in joints causes their inflammation
3. The vertebral column has 10 thoracic vertebrae
4. The joint between adjacent vertebrae is a fibrous joint
Which of the following does not favor the formation of large quantities of dilute urine?
1. Alcohol | 2. Caffeine |
3. Renin | 4. Atrial-natriuretic factor |
Match each item in COLUMN I [Hormone] with one in COLUMN II [Function] and select your answer from the codes given:
COLUMN I | COLUMN II | ||
A. | Gastrin | a. | Contraction of gall bladder and stimulation of enzyme secretion by pancreas |
B. | Cholecystokinin | b. | Increased HCl secretion |
C. | Secretin | c. | Inhibition of gastric secretion and motility |
D. | Gastric inhibitory peptide | d. | Stimulation of bicarbonate rich mucoid secretions from pancreas |
Codes
A | B | C | D | |
1. | a | b | c | d |
2. | a | b | d | c |
3. | b | a | d | c |
4. | b | a | c | d |
The causes of indigestion include all except:
1. parasympathetic stimulation
2. anxiety
3. food poisoning
4. eating spicy food
What is released at ovulation?
1. | Primary oocyte arrested at meiosis I |
2. | Primary oocyte arrested at meiosis II |
3. | Secondary oocyte arrested at meiosis I |
4. | Secondary oocyte arrested at meiosis II |
The fetus develops limbs by the end of:
1. One month of pregnancy
2. Two months of pregnancy
3. First trimester of pregnancy
4. Second trimester of pregnancy
What is transferred into the fallopian tube in ZIFT?
1. | Zygote only |
2. | Embryos with more than 8 blastomeres |
3. | Zygote or embryos with up to 8 blastomeres |
4. | All of the above can be transferred during ZIFT |
The neurotransmitter released by a motor neuron at the neuro-muscular junction is:
1. Acetylcholine
2. Adrenaline
3. GABA
4. Serotonin
The tympanic membrane:
1. is covered on both sides by skin
2. is covered on both sides by mucus membrane
3. is covered with skin on the outside and by mucus membrane on the inside
4. is covered with skin on the inside and by mucus membrane on the outside
Examination of blood of a person suspected to be suffering from anemia shows a decrease in the number of all formed elements. He is most likely suffering from:
1. Iron deficiency
2. Megaloblastic anemia
3. Bone marrow dysfunction
4. Liver dysfunction
The value of partial pressure of oxygen in alveolar air is:
1. less than that in oxygenated blood
2. more than that in atmospheric air
3. equal to that in oxygenated blood
4. more than that in tissues
Aldosterone can be secreted by adrenal cortex when it is stimulated most directly by:
1. ADH | 2. Renin |
3. Angiotensin | 4. ANF |
A capillary network around the renal tubule is formed by:
1. Afferent arteriole | 2. Efferent arteriole |
3. Vasa recta | 4. Arcuate artery |
During muscle contraction, when the myosin head releases ADP and iP it:
1. forms cross bridge with actin
2. pulls actin towards M-line
3. goes back to its relaxed state
4. gets detached from the cross bridge
Coca alkaloid or cocaine is obtained from
1. Papaver somniferum
2. Atropha belladona
3. Erythroxylum coca
4. Datura
In RNAi, the genes are silenced using :
1. dsRNA
2. ssDNA
3. ssRNA
4. dsDNA
The nerve centres which control the body temperature and the urge for eating are contained in
1. hypothalamus
2. pons
3. cerebellum
4. thalamus
Which one of the following is the most likely reason for the regular menstruation cycle not occurring in females?
1. | Fertilisation of the ovum |
2. | Maintenance of the hypertrophical endometrial lining |
3. | Maintenance of a high concentration of sex hormones in the bloodstream |
4. | Retention of well-developed corpus luteum |
The property of water that enables it to
stabilize temperature in bodies of organisms
and thus makes it indispensible for life is:
1. High specific heat
2. High latent heat of fusion
3. High latent heat of vaporization
4. High cohesion and adhesion
Which of the given statements is correct in the context of visualizing DNA molecules separated by agarose gel electrophoresis?
1. | DNA can be seen in visible light |
2. | DNA can be seen without staining in visible light |
3. | Ethidium bromide stained DNA can be seen in visible light |
4. | Ethidium bromide stained DNA can be seen under exposure to UV light |
More than 70 per cent of livestock population is found in:
1. | Denmark | 2. | India |
3. | China | 4. | India and China |
How can a healthy man get filariasis?
1. Through droplet infection from an affected person
2. Through contaminated water or food
3. Through sexual contact with an infected person
4. Through the bite by the female mosquito vector
What exactly does the nature act upon when selecting an organism?
1. dominant alleles
2. recessive alleles
3. phenotype
4. combined genotype
The “Biogenetic Law” was given by :
1. | von Baer | 2. | Ernst Haeckel |
3. | Hugo de Vries | 4. | Theodosius Dobzhansky |
The wings of an insect and the wings of a bird are examples of:
1. | analogous structures | 2. | homologous structures |
3. | vestigial structures | 4. | phylogenetic structures |
Signals from a fully developed foetus and placenta ultimately lead to parturition which requires the release of:
1. Oxytocin from the maternal pituitary
2. Oxytocin from foetal pituitary
3. Relaxin from the placenta
4. Estrogen from the placenta
Somatostatin from the hypothalamus:
1. stimulates secretion of insulin and glucagon by pancreas
2. inhibits secretion of insulin and glucagon by pancreas
3. stimulates secretion of growth hormone from anterior pituitary
4. inhibits secretion of growth hormone from anterior pituitary
Two atria are present in the heart of all the following vertebrates except:
1. | Fishes | 2. | Amphibians |
3. | Crocodiles | 4. | Birds |
The type of joint seen between the carpal bones is:
1. Hinge | 2. Pivot |
3. Gliding | 4. Saddle |
Which of the following will bring about inhalation?
1. Contraction of diaphragm and contraction of external intercostals
2. Relaxation of diaphragm and relaxation of external intercostals
3. Contraction of diaphragm and contraction of internal intercostals
4. Relaxation of diaphragm and relaxation of internal intercostals
The phenomenon of the evolution of different species in a given geographical area starting from a point and spreading to other habitats is called:-
(1) Saltation
(2) Co-evolution
(3) Natural selection
(4) Adaptive radiation