Equal moles of hydrogen and oxygen gases are placed in container with pin hole through which both can escape. What fraction of the oxygen escapes in the time required for one half of the hydrogen to escape? (1) 1/4 (2) 3/8 (3) 1/2 (4) 1/8
The Avena curvature is used for bioassay of (a) IAA (b) ethylene (c) ABA (d) GA3.
Water soluble pigments found in plant cell vacuoles are (a) carotenoids (b) anthocyanins (c) xanthophylls (d) chlorophylls.
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you ...
Emerson's enhancement effect and Red drop have been instrumental in the discovery of (a) photophosphorylation and cyclic electron transport (b) oxidative phosphorylation (c) photophosphorylation and noncyclic electron transport (d) two photosystems ...
In a chloroplast the highest number of protons are found in (a) intermembrane space (b) antennae complex (c) stroma (d) lumen of thylakoids.
Water vapour 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 following options. (a) The above processes ...
Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the Kingdom (a) Fungi (b) Animalia (c) Monera (d) Protista.
In which of the following all three are macronutrients? (a) Molybdenum, magnesium, manganese (b) Nitrogen, nickel, phosphorus (c) Boron, zinc, manganese (d) Iron, copper, molybdenum
In meiosis crossing over is initiated at (a) zygotene (b) diplotene (c) pachytene (d) leptotene.
Which of the following is not a characteristic feature during mitosis in somatic cells ? (a) Chromosome movement (b) Synapsis (c) Spindle fibres (d) Disappearance of nucleolus
Spindle fibres attach on to (a) centromere of the chromosome (b) kinetosome of the chromosome (c) telomere of the chromosome (d) kinetochore of the chromosome.
Which one of the following statements is wrong ? (a) Uracil is a pyrimidine. (b) Glycine is a sulphur containing amino acid. (c) Sucrose is a disaccharide. (d) Cellulose is a polysaccharide.
A typical fat molecule is made up of (a) one glycerol and one fatty acid molecule (b) three glycerol and three fatty acid molecules (c) three glycerol molecules and one fatty acid molecule (d) one glycerol and three fatty acid molecules.
Which one of the following cell organelles is enclosed by a single membrane ? (a) Lysosomes (b) Nuclei (c) Mitochondria (d) Chloroplasts
Microtubules are the constituents of (a) centrioles, spindle fibres and chromatin (b) centrosome, nucleosome and centrioles (c) cilia, flagella and peroxisomes (d) spindle fibres, centrioles and cilia.
Mitochondria and chloroplast are (A) semiautonomous organelles (B) formed by division of preexisting organelles and they contain DNA but lack protein synthesising machinery. Which one of the following options is correct? (a) (A) is true but (B) is false. ...
Which of the following features is not present in Periplaneta americana ? (a) Exoskeleton composed of Nacetylglucos amine (b) Metamerically segmented body (c) Schizocoelom as body cavity (d) Indeterminate and radial cleavage during embryonic development
Which type of tissue correctly matches with its location ? Tissue Location (a) Transitional epithelium Tip of nose (b) Cuboidal epithelium Lining of stomach (c) Smooth muscle Wall of intestine (d) Areolar tissue Tendons
Specialised epidermal cells surrounding the guard cells are called (a) bulliform cells (b) lenticels (c) complementary cells (d) subsidiary cells.
Cotyledon of maize grain is called (a) coleoptile (b) scutellum (c) plumule (d) coleorhiza.
Stems modified into flat green organs performing the functions of leaves are known as (a) phylloclades (b) scales (c) cladodes (d) phyllodes.
Which of the following is not a stem modification? (a) Tendrils of cucumber (b) Flattened structures of Opuntia (c) Pitcher of Nepenthes (d) Thorns of citrus
Which of the following features is not present in the Phylum Arthropoda? (a) Parapodia (b) Jointed appendages (c) Chitinous exoskeleton (d) Metameric segmentation
Which of the following characteristic features always holds true for the corresponding group of animals? (a) Possess a mouth with an upper and a lower jaw Chordata (b) 3-chambered heart with one incompletely divided ventricle Reptilia (c) Cartilaginous ...
Which one of the following characteristics is not shared by birds and mammals? (a) Viviparity (b) Warm blooded nature (c) Ossified endoskeleton (d) Breathing using lungs
In bryophytes and pteridophytes, transport of male gametes requires (a) birds (b) water (c) wind (d) insects.
Select the correct statement. (a) Sequoia is one of the tallest trees. (b) The leaves of gymnosperms are not well adapted to extremes of climate. (c) Gymnosperms are both homosporous and heterosporous. (d) Salvinia, Ginkgo and Pinus all are gymnosperms.
Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature? (a) The names are written in Latin and are italicised. (b) When written by hand the names are to be underlined. (c) Biological names ...
One of the major components of cell wall of most fungi is (a) cellulose (b) hemicellulose (c) chitin (d) peptidoglycan.