List of top Biology Questions asked in AIIMS

Citrus canker is caused by
The endosperm in gymnosperm is formed after fertilisation. The endosperm of gymnosperm is formed by triple fusion.
Ploidy of endothecium, microspore mother cell, tapetum and microspore is respectively,
Thermococcus, Methanococcus and Methanobacterium exemplify
The saturation point of CO in C plants is
Select the correct matching.
Purkinje fibres are present in
Which of the following is/are free living nitrogen fixers?
Which of the following is correct for the given floral diagrams?
Which of the following is not a characteristic of meiosis?
Which of the following is not a bioassay for cytokinins?
Which of the following disorders are caused due to recessive autosomal mutations?
When red and white flowered Mirabilis plants are crossed all pink flowers are seen in F generation. When F progeny is selfed, the expected phenotypic and genotypic ratios are
What is diapedesis?
The amphids are cuticular elevations on the ventrolateral lips of Ascaris. These are
Refer to the given figure of T.S. of penis. How will penile function be altered if the blood supply to the B is impaired?
In frog, mesorchium is a thin fold of membrane extending between
Golgi apparatus is absent in
Glycosylation of proteins is done by
Diagrams of hypogynous, perigynous and epigynous flowers are given below. Find out the option that correctly exemplifies A, B, C and D.
Developing spermatozoa receive nutrition from
Transpiration occurs only when stomata are open. Transpiration occurs only through stomata.
Respiratory pathway is an amphibolic pathway. In respiration, there is breakdown of many substances (catabolism) and synthesis of many substances (anabolism) by respiratory intermediates.
Net primary productivity is gross primary productivity minus respiration. Secondary productivity is produced by heterotrophs.
Colpa aurea is a specialised pollinating agent of orchid Ophrys speculum. Male Colpa mistakes the Ophrys flower for female wasp to copulate with it.