Multiple Choice QuestionsMicrotubules are the constituent of
spindle fibres, centrioles and cilia
centrioles, spindle fibres and chromatin
centrosome, nucleosomes and centrioles
cilia, flagella and peroxisomes
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.
Lack of relaxation between successive stimuli in sustained muscle contraction is known as
fatigue
tetanus
tonus
spasm
B.
tetanus
Tetanus results in sustained muscular spasms. This is due to muscle fatigue.
Photosensitive compound in human eye is made up of
opsin and Retinal
opsin ans Retinol
transducin and Retinene
guanosine and Retinol
A.
opsin and Retinal
The photosensitive pigment Rhodopsin of the human eye is made up of opsin and Retinal ( the aldehyde form of vitamin-A/ Retinol).
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 correct
B.
I is true but II is false
Mitochondria and chloroplast have DNA and are capable of self-replication, thus they are semi-autonomous bodies
The organelles do synthesize some of protein and hence they have the protein synthesizing machinery. However, most of the proteins are derived from the nucleus.
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 |
C.
| 3-chmbered heart with one incompletely divided ventricle | Reptilia |
Except for crocodilians, which have a four-chambered heart, all reptiles have a three-chambered heart consisting of two atria and one ventricle. The chamber called the right atrium receives deoxygenated, or "spent," blood returning from the body tissues.
Tricarpellary, syncarpous gynoecium is found in flowers of
Solanaceae
Fabaceae
Poaceae
Liliaceae
D.
Liliaceae
Liliaceae ga G3 condition
In which of the following, all three are macronutrients
Iron, copper, molybdenum
Molybdenum, magnesium, manganese
Nitrogen, nickel, phosphorous
Boron, zinc, manganese
C.
Nitrogen, nickel, phosphorous
Option c is the most appropriate as it has two macronutrients.
The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the
thermoacidophiles
methanogens
eubacteria
halophiles
B.
methanogens
Methanogens are group of obligate anaerobic ancient and primitive bacteria. They are involved in the production of the methane gas which is used as a biogas.
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
reduce the rate of heart beat
B.
decrease the affinity of haemoglobin with oxygen
Reduction in pH of blood that is an increase in acidity favours the dissociation of oxyhaemoglobin thereby giving up more O2. phenomenon occurs due to increase in C02 concentration then it is called Bohr effect.
Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom
Protista
Fungi
Animalia
Monera
A.
Protista
All the single celled eukaryotic organism are grouped under the Kingdom Protista. These includes euglenoids, dinoflagellates, slime moulds and chrysophytes
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