Biology Today - May 2018
The QRS wave (complex) begins after a fraction of second of the P wave. It begins as a small downward deflection (Q) and continu ...
the cuff is then slowly released, causing the pressure in the cuff and on the artery to decrease. When cuff pressure has decreas ...
Fibrillation Fibrillation is a condition in which the heart muscle contracts very rapidly but in an uncoordinated fashion. There ...
THERAPEUTIC DEVICES Prosthetic cardiac pacemaker/Artificial pacemaker. When the natural pacemaker SA node does not work properly ...
(iii) SAN is located on the left upper corner of the right atrium. (iv) Stroke volume × Heart rate = Cardiac output. (a) (i) onl ...
Pacemaker is situated in heart (a) in the wall of right atrium (b) on inter auricular septum (c) on inter ventricular septum (d ...
In normal ECG which of the segment shows the correct representation of respective activity of the human heart? (a) P - depolari ...
(a) SA node → Purkinje fibres → bundle of His → AV node → heart muscles (b) SA node → AV node → bundle of His → Purkinje fibres ...
Class XI Biological Classification The scientific procedure of arranging organisms into groups and subgroups on the basis of th ...
Numerical Taxonomy : It evaluates resemblances and differences through statistical methods based on a large number of characters ...
Phylogenetic relationships, particularly of lower organisms, are not fully reflected. For example, certain green algae and some ...
Heterotrophic nutrition is of three types : saprotrophic, symbiotic and parasitic. Archaebacteria are a group of most primitive ...
Which group of protista is photosynthetic in the presence of sunlight and behave like heterotrophs when deprived of sunlight? H ...
The gametes are multinucleate and are called coenogametes. Sexual reproduction produces a diploid spore called zygospore. Some ...
The food reserves are stored as glycogen or fat. Most of them are capable of locomotion. They have a definite shape and size an ...
The Kingdom Plantae includes eukaryotic, photosynthetic organisms. According to traditional systems of classification, the Kin ...
Table : Characteristics of different classes of algae Classes Structure Occurrence Major pigments Reserve food material Reproduc ...
Embryo stage is present. The embryo grows into a sporophyte. The sporophyte consists of foot, seta and capsule. Sporophyte prod ...
The spores germinate to produce haploid gametophyte, called prothallus. The homosporous pteridophytes produce bisexual gametoph ...
GYMNOSPERMS Gymnosperms are seed plants in which the seeds remain exposed over the surface of the megasporophylls. The plant bo ...
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