Following are the important 100 Biology Questions for Classes 5 to 12 that students should prepare for exams like CBSE, NEET –
Which of the following explains the importance of species in an ecosystem?
Match List I with List II with respect to lac operon List – I List – II A) Product of gene y i) Repressor B) Product of gene z ii) Transporter protein C) Product of gene I iii) Hydrolase D) Product of gene an iv) Transferase.
Which one of the following is a character of all amphibians, without any exception?
The plant body is always undifferentiated in
Coralloid roots in Cycas can fix atmospheric nitrogen because they have
The chief component of lipid bilayer of cell membrane is
Read the given statements regarding Cyanobacteria and identify the correct one. I. The Cyanobacteria are unicellular, colonial or filamentous, and are commonly found in most harsh habitats. II. The colonies of Cyanobacteia often form blooms in polluted water bodies
In the wall of the stomach, oblique muscle layer is present between the
In eukaryotes, RNA polymerase III is not involved in transcribing
Excretory structure in Saccoglossus is
Identify the plant which has marginal placentation in the ovary, diadelphous condition of the stamens and hypogynous flowers.
It was found that when the same environmental challenge was provided to the two sets of organisms who belonged to different ancestors and with different evolution patterns evolved similar phenotypic to survive better is called
Simple epithelium is a tissue in which the cells are
resist infections and are also associated with allergic reactions.
Pinnate compound leaves are more commonly seen in the family
Which of the following is correct about Aves ?
By identifying the shape of the potato, select the option that represents the causative agent for this condition.
Statins, a bioactive molecule, inhibits the enzyme responsible for synthesis of
The following figure shows a human blood cell. Select the option that identifies it and gives its characteristics.
Match the endocrine glands given in column I with their location in column II and select the correct option. Column I (gland) Column II (location) (a) Thymus (i) Dorsal side of diencephalon (b) Hypothalamus (ii) Sella turcica (c) Pineal gland (iii) Diencephalon (d) Pituitary gland (iv) Ventral to aorta
Mark the mismatch .
Which of the following abdominal sterna does not contribute to the formation of brood pouch in the female Periplaneta ?
In erythroblastosis foetalis,
During succession A. composition of community is changed B. structure of community is changed C. biomass of community is changed
The incorrect statement w.r.t proteins
The free living, non pathogenic nematode which was sequenced as a part of HGP is
During secondary growth in dicot root, phellogen forms towards outer side.
In which stage of cell cycle a major decision to divide or not to divide is taken by the cell?
X linked recessive allele found in human male is inherited by
Binomial nomenclature system was first effectively followed by
Which one of the following is not a correct statement?
What is the correct sequence of stages during spermatogenesis?
Identify the parts labelled in the diagram: A B C D E F 1. Pericarp Cotyledon Shoot apical meristem Hypocotyl root axis Root tip Endosperm 2. Seed coat Cotyledon Shoot apical meristem Hypocotyl root axis Coleorhiza Endosperm 3. Seed coat Endosperm Shoot apical meristem Hypocotyl root axis Coleorhiza Cotyledon 4. Seed coat Cotyledon Shoot apical meristem Hypocotyl root axis Root tip Endosperm
Choose the incorrect match.
Which of the following contributes to elongation growth of plant axis in grass A) Intercalary meristem B) Shoot and root apical meristem C) Intercalary and Interfascicular meristem
The members of Phaeophyceae are :
Floral features are mainly used in angiosperms identification because
Spermatogenesis starts at the age of puberty due to a significant increase in the secretion of
Which of the following hormone is not present in the portal veins linking hypothalamus with anterior lobe of pituitary gland?
The ‘Fluid Mosaic Model’ of plasma membrane was proposed by
Which of the following processes contributes maximally to population growth in a newly colonised habitat ?
Edible ascomycetous fungi are I. Puffballs II. Morels III. Bread mould IV. Truffles
Which phase is the reverse of prophase?
Refer to the given figure showing pyramid of number in a certain habitat. Identify A, B and C. A B C 1. Grass Rabbit Fox 2. Phytoplankton Small fish Large fish 3. Tree Birds Hawk 4. Tree Birds Parasites
Evolution of life forms from non-living organic molecules cannot occur now because of the
Choose the wrong match related to stored food in different groups of organisms. 1. Green algae Starch 2. Red algae Floridean starch 3. Brown algae Mannitol 4. Blue green algae Paramylum starch
What is external to the plasma membrane in a prokaryotic cell like bacteria?
Select the correct route for the passage of sperms in male frogs.
Which one of the following is not the characteristic of the phylum to which Pleurobrachia belongs?
A bone disorder that is caused due to accumulation of a nitrogenous waste is
The ratio of length of the long arm to the short arm of a chromosome is called arm ratio. The maximum arm ratio is found in:
Which of the following guards the opening of hepatopancreatic duct into the duodenum?
Match the following and choose the correct option. Column I Column II (a) Asymmetry (i) Pheretima (b) Biradial symmetry (ii) Pleurobrachia (c) Pentamerous radial symmetry (iii) Pila (d) Bilateral symmetry (iv) Asterias
Find the incorrectly matched pair w.r.t placentation.
Match the name of the animal with one characteristic and the taxon to which it belongs. Animal Character Taxon 1 Ophiura Internal fertilisation Echinodermata 2 Balanoglossus Proboscis gland Hemichordata 3 Petromyzon Direct development Cyclostomata 4 Trygon Electric organs Chondricthyes
In hydroponics, plants are grown
Inflorescence of Smilax is
The bundles of sperms of the male cockroach are termed
Floral formula of tomato/tobacco is
Select the incorrect match. 1. GEAC Validity of GM research 2. Developing countries Rich in bio-resources 3. Rice varieties 20,00,000 in India alone 4. Indian patents bill Second amendment recently cleared
The heartwood occupies:
Which one of the following correctly describes the location of some body parts in the earthworm Pheretima ?
According to Darwin, the fitness refers ultimately and only to
Match the column w.r.t. green algae : Column I Column II A. Unicellular alga (i) Ulothrix B. Filamentous alga with collar shaped chloroplast (ii) Spirogyra C. Filamentous alga with ribbon shaped chloroplast (iii) Volvox D. Colonial coenobial alga (iv) Chlamydomonas
In diploid organism the gamete producing cells are called a. gamete mother cells b. gametocytes c. spore cell
Mark the correct sequence with regard to the process of spermatogenesis.
Which of the following are the functions of the large intestine? a. Mass peristalsis and defaecation b. Formation of faeces c. Absorption of some water, minerals and certain drugs d. It contains bacteria that produce some vitamins
Formation of secretory vesicles is a function of
Choose the incorrect statement.
Select the correct set of events that occur during expiration A) relaxation of external intercostal muscles B) diaphragm is arched upwards C) intra-pulmonary pressure increases D) ribs and sternum are lifted up E) pulmonary volume increases
Round and biconcave cells are
The speed of migration of ions in an electric field during gel electrophoresis depends on
Aves originated from reptiles. Which of the following is not an advancement of birds over reptiles?
Which one is a modified leaf? (a) Pitcher of Nepenthes (b) Tendril of Pisum sativum (c) Spine of Cactus
The deficiency of an essential element can be fulfilled by-
Interkinesis is present between :
The process of nitrogen cycle that enrich the soil with ammonia are A. Ammonification B. Nitrification C. Nitrogen assimilation D. Biological Nitrogen fixation
Sporophyte is dominant, photosynthetic and independent phase but gametophytes are parasitic on sporophyte and have limited number of cells show the following type of life cycle
In somatic hybridisation, the naked protoplasts are fused by
The taxonomic category which comes just after species in ascending order of taxonomic hierarchy is
In dicot stem complementary cells are produced by
Select the correct statement with regard to neural tissue.
Which of the following are the general characters of Platyhelminthes? (a) Dorso-ventrally flattened body (b) External fertilisation (c) Development is indirect (d) Sexes are separate
Middle layers of the microsporangial wall
Which of these is not an important component of initiation of parturition in humans?
If the gynoecium is present at the topmost position of the thalamus above the rest of floral parts, then the flower is described as: (a) hypogynous (b) perigynous (c) epigynous
Sickle cell anaemia is
Taylor and his colleagues proved the sem-conservative model of replication of DNA by performing experiments on
According to Hugo de Vries, the mechanism of evolution is
Unisexuality of flowers prevents
World wildlife week is the
Match the following and choose the correct option. Column I Column II (a) Spiracles (i) Digestion (b) Proventriculus (ii) Vision (c) Ommatidium (iii) Circulation (d) Alary muscles (iv) Respiration
Three plants A, B and C are modified for storage in the given diagram. Identify the correct statement.
Pneumatic bones are found in
The oval or round and loosely arranged mesophyll cells situated below elongated compactly placed green cells arranged vertically and parallel to each other in dorsiventral leaf is
In Periplaneta americana,
Choose the incorrect statement.
Identify the non-mendelian disorder.