What Is The Impact Of Human Domination On The Nitrogen Cycle?
Impact of human domination of the nitrogen cycle includes – Global increase in concentrations of nitrous oxide (N2O), a greenhouse... View Article
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What Factors Influence The Affinity Of Hemoglobin For Oxygen?
The affinity of haemoglobin for oxygen can be influenced by these physiological factors – pH-independent of carbon dioxide The partial... View Article
What Factors Affect Gas Exchange In The Lungs?
Through the process of gaseous exchange, carbon dioxide and oxygen move between the lungs and the bloodstream. This is the... View Article
What Does Peristalsis Mean?
Peristalsis is a wave-like pattern of muscular contraction taking place to push liquids or solids along the tube-like structures of... View Article
What Does It Mean When RER Is Greater Than 1?
Respiratory Exchange Ratio (RER) makes it possible to calculate which specific fuel (protein, fat or carbohydrate) is being oxidized. This... View Article
What Does Induced Fit Mean?
It suggests a continuous change in the shape and conformation of an enzyme responding to substrate binding. This creates the... View Article
What Does Hypertension Do To Blood Vessels?
High blood pressure or hypertension is when blood travels through blood vessels with all the more force. When the pressure... View Article
What Does Casparian Strip Mean?
Casparian strips are bands of cell wall matter which are deposited in the transverse and radial walls of the endodermis.... View Article
What Does Blood Coagulation Mean?
Blood coagulation or clotting is a vital process that prevents excessive bleeding in case a blood vessel gets injured. In... View Article
Is there any relationship in the number of chromosomes of meiocytes and gametes?
Meiocytes are the cells, which undergo meiosis to produce gametes. The number of chromosomes present in gametes is half the... View Article
A haploid parent produces gametes by mitotic division. Does this mean that meiosis never occurs in organisms that are haploid?
Organisms that are haploid, e.g. algae such as Volvox, Spirogyra, etc. show meiosis in the zygote. The haploid gametes fuse... View Article
How long do the seeds remain alive after they are dispersed?
The viability of seeds varies from species to species. Some seeds remain viable only for a few months, whereas many... View Article
Is there any relationship between the number of ovules in an ovary and the number of seeds present in a fruit?
Ovules after fertilisation, mature into a seed and the ovary develops into a fruit. So if all the ovules present... View Article
Endosperm development precedes embryo development. Why?
The endosperm is produced from the primary endosperm nucleus, which is produced by triple fusion as the second male gamete... View Article
Do you think that cleistogamy is advantageous or disadvantageous to the plant? Why?
Cleistogamous flowers show autogamy as they do not open. Anthers are present close to the stigma and receive pollen grains... View Article
How long do you think the pollen grains retain viability?
The viability of pollen grains varies from species to species. Pollen grains of cereals such as wheat, rice, etc. show... View Article
What would be the ploidy of the cells of the microspore tetrad?
Microspore tetrad is formed by meiosis in the pollen mother cells. If the plant is diploid then the cells of... View Article
Can you name the two parts in a flower in which the two most important units of sexual reproduction develop?
The two reproductive parts of a flower are the androecium and gynoecium. The androecium is the male reproductive part, which... View Article
Can you name a plant in which the sepals remain attached?
Sepals form the outermost whorl of the flower known as calyx. They are generally green in colour. Normally sepals fall... View Article
When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is
A) pentaploidy B) tetraploidy C) triploidy D) diploidy Answer:B) tetraploidy Explanation: Primary endosperm nucleus is formed by the fusion of... View Article
