Biology Today — May 2017

Symptoms Fig.:^ Life^ cycle^ of^ Plasmodium • Malaria is characterised by fever at intervals, each attack of malaria fever sh ...

Trypanosomiasis or African sleeping sickness Trypanosoma gambiense Biting of tse tse fly (Glossina sp.)/ Weeks or months Swell ...

Cardiovascular diseases are those diseases that affect the blood vessels and heart, for e.g., (i) Arteriosclerosis - Hardening ...

Cellular immunity or cell-mediated immune system or T-cell immunity (CMIS) • T lymphocytes or T-cells are produced in the b ...

N N VH VH N VL CL Variable regions (V) Constant regions (C) Heavy chain (H) N VL Light chain (L) CL C S–S S–S S–S CH 3 CH 2 CH 2 ...

VACCINATION AND IMMUNISATION • Vaccine (L. vacca = cow) is a preparation/suspension or extract of dead/attenuated (weakened) ...

DISORDERS OF IMMUNE SYSTEM Hypersensitivity (Allergy) • Hypersensitivity or allergy is an exaggerated immune response to comm ...

• Symptoms of HIV infection include fever, lethargy, pharyngitis, nausea, headache, rashes, etc. • For prevention, one sho ...

(iii) umor viruses:T Some viruses are known to be involved in oncogenic transformations. Possible symptoms of cancer (i) A lump ...

Addiction and Dependence • Addiction is a psychological attachment to certain effects such as euphoria and a temporary feelin ...

A B C (a) IgM Granules of hapten Mast cell (b) IgG Granules of serotonin Basophil (c) IgE Granules of histamin ...

(d) cancer cells cannot function properly because they suffer from density-dependent inhibition. Live vaccine is a (a) low do ...

SECTION - A Our government has intentionally imposed strict conditions for MTP in our country. Justify giving a reason. State t ...

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p^2 + 2pq + q^2 = 1. Explain the algebraic equation on the basis of Hardy Weinberg's principle. (a) What precaution(s) would yo ...

Embryo sac 3 cells 3 cells DNA packing of eukaryotes is carried out with help of lysine and arginine rich basic proteins called ...

The type of vegetative propagation used by horticulturists to multiply trees like litchi and pomegranate is (a) air layering (b ...

(a) micropyle, mesogamy (b) integuments, mesogamy (c) funicle, mesogamy (d) chalaza, chalazogamy In ovoviviparous animals (a) t ...

Which of the following is false regarding fertilisation? (a) In algae and fishes, fusion of gametes occurs outside the body. (b ...

Key is published in this issue. Search now! J Check your score! If your score is > 90% ExcELLEnT wOrk! You are well prepared ...