Microtubules are the constituent of
spindle fibres, centrioles and cilia
centrioles, spindle fibres and chromatin
centrosome, nucleosomes and centrioles
centrosome, nucleosomes and centrioles
A.
spindle fibres, centrioles and cilia
Microtubules are structures present in cilia, flagella, centrioles and spindle fibres. They are also the part of fibres found in cytoskeleton.
Which of the following characteristic features always holds true for the corresponding group of animals?
| Viviparous | Mamalia |
| Posess a mouth with an upper and lower jaw | Chordata |
| 3-chmbered heart with one incompletely divided ventricle | Reptilia |
| Cartiliginous- endoskeleton | Chondrichthyes |
Lack of relaxation between successive stimuli in sustained muscle contraction is known as
fatigue
tetanus
tonus
tonus
Photosensitive compound in human eye is made up of
opsin and Retinal
opsin ans Retinol
transducin and Retinene
transducin and Retinene
Tricarpellary, syncarpous gynoecium is found in flowers of
Solanaceae
Fabaceae
Poaceae
Poaceae
Reduction in pH of blood will
reduce the blood supply to the brain
decrease the affinity of haemoglobin with oxygen
release bicarbonate ions by the liver
release bicarbonate ions by the liver
Mitochondria and choloroplast are :
I. semi-autonomous organelles.
II. formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery.
II is true but I is false
I is true but II is false
Both I and II are false
Both I and II are false
The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the
thermoacidophiles
methanogens
eubacteria
eubacteria
Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom
Protista
Fungi
Animalia
Animalia
In which of the following, all three are macronutrients
Iron, copper, molybdenum
Molybdenum, magnesium, manganese
Nitrogen, nickel, phosphorous
Nitrogen, nickel, phosphorous
