When the separation of photosynthetic pigments is carried out using a strip of chromatographic paper, then the dried strip shows four distinct bands P, Q, R and S as shown in the given figure. Identify them and select the correct option.
Read the given paragraph. Where there is alternation of generations, the haploid multicellular plant is called a (i) and the diploid multicellular plant is called a (ii). (iii) generation is the dominant phase in algae showing haplontic type of life cycle. Bryophytes and pteridophytes usually possess (iv) types of life cycle. Select the correct sequence of terms to complete the above paragraph.
Plant hormones play a role in regulating the development of plant seeds. The graphs below plot embryo growth and the changes in hormone concentration over time. Based on these results, which hormone most likely regulates embryo growth?
An investigator places an isolated neuron in a calcium-free medium, gives the neuron a suprathres hold stimulus and then performs an assay to test whether neurotransmitter is released into the medium. Which of the following outcomes would you predict?
No neurotransmitter is detected since influx of calcium into the synaptic knob is required for neurotransmitter release.
No neurotransmitter is detected since influx of calcium is required in order for the neuron to conduct an action potential.
Neurotransmitter is detected since calcium is not required for action potential conduction and the initial stimulus was suprathres hold.
We cannot predict the outcome without knowing whether the neuron was myelinated or non-myelinated.
Complete the following paragraph by selecting the option that correctly fills the blanks (i) - (iv). The kidneys have built-in mechanisms for the regulation of glomerular filtration rate. One such efficient mechanism is carried out by (i). It is a special sensitive region formed by cellular modifications in the (ii) and the (iii) at the location of their contact. A fall in GFR can activate the JG cells to release (iv) which can stimulate the glomerular blood flow and thereby the GFR back to normal.