List of top Biology Questions

Given below is the diagram of human lymphatic system, where $A$, $B$, $C$ and $D$ are lymphoid organs. Select incorrect option regarding the lymphoid organs labelled as $A$, $B$, $C$ and $D$.
Given below is a list of different steps $(i-vi)$ involved in respiration. (i) Utilisation of $O_2$ by the cells for catabolic reactions. (ii) Transport of gases by the blood. (iii) Pulmonary ventilation by which atmospheric air is drawn in and $CO_2$ is released out. (iv) Release of resultant $CO_2$. (v) Diffusion of $O_2$ and $CO_2$ between blood and tissues. (vi) Diffusion of gases ($O_2$ and $CO_2$) across alveolar tissues. Select an option which has correct sequence of all the steps.
Given below is a table of factors affecting microbial decomposition. ($'+'$ means 'favouring' and $'-'$ means inhibiting or lowering). Select the correct option.
Given below are types of cells present in some animals. Which of the following cells can differentiate to perform different functions?
Given below are some differences between primary air pollutants and secondary air pollutants. Which one of the following is an incorrect difference?
Given below are a few statements regarding somatic hybridisation. Choose the correct statements. (i) Protoplasts of different cells of the same plant are fused. (ii) Protoplasts from cells of different species can be fused. (iii) Treatment of cells with cellulase and pectinase is mandatory. (iv) The hybrid protoplast contains characters of only one parental protoplast.
Given below are some of the stages of the hydrarch. A. Marsh - meadow stage B. Reed-swamp stage C. Submerged plant stage D. Phytoplankton stage E. Free floating plant stage Select the option that represents the correct sequence of these stages.
Given are names of some transgenic animals. Identify the name of transgenic sheep.
GIFT is
GERL is part of endomembrane system which does not include
Gemmule formation in sponges is helpful in
GEAC (genetic engineering approval committee) has been set up under
GEAC stands for
Gas vacuole is present in
Functions of plant growth promoters and plant growth inhibitors are given here in a jumbled up manner. Select the option that correctly segregates these functions. (i) Cell division (ii) Cell enlargement (iii) Pattern formation (iv) Tropic.growth (v) Flowering (vi) Fruiting (vii) Seed germination (viii) Response to wounding (ix) Response to stresses of biotic and abiotic origin (x) Dormancy
Functional residual capacity can be represented as
Functional unit of skeletal muscle is called
Fruit of custard apple is :
Fruit shape in shephered's purse (Capsella bursa) is of two types? Which pair of strains possess the genotype $Tt$ ?
From the following relationships between respiratory volumes and capacities, mark the correct option. (i) Inspiratory Capacity $(IC) = $Tidal Volume $+$ Residual Volume (ii) Vital Capacity $(VC) =$ Tidal Volume $(TV) +$ Inspiratory Reserve Volume $(IRV) +$ Expiratory Reserve Volume $(ERV)$ (iii) Residual Volume $(RV) =$ Vital Capacity $(VC) -$ Inspiratory Reserve Volume $(IRV)$ (iv) Tidal Volume $(TV) =$ Inspiratory Capacity $(lC) -$ Inspiratory Reserve Volume $(IRV)$
Fragrant flowers with well developed nectaries are an adaptation for
Fossa ovalis occurs in
Founder of binomial nomenclature was
Force developed in cortex of root which pushes water into xylem of root soil is
Foramen of Magendie and foramina of Luschka are found over