Movement of ions or molecules in a direction opposite to that of prevailing electro chemical gradient is known as
Grana and stroma lamellae are the parts of
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Solution
Lamellae of chloroplast are known as thylakoids.
Which of the following is known as ‘resurrection plant’?
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Solution
In dry conditions, the plant rolls up in to a compact ball and during the rainy conditions the ball on absorbing moisture be comes green again. Such plants are called resurrection plants.
Rate of breathing is controlled by
The mast cells secrete
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Solution
Mast cells occur in connective tissue proper, these are modified basophils of blood. Mast cells secrete heparin, histamine and serotonin.
The diagram given here is the standard ECG of a normal person, the P-wave represents the :
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Solution
Thalamus is
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Solution
The broadened base of flower which lies at the tip of pedicel is called torus or thalamus or receptacle.
Manganese is required in:
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Solution
Manganese is essential for many plant functions. Some of them are:
•The assimilation of carbon dioxide in photosynthesis.
•It is involved in the Hill Reaction where water is split during photosynthesis.
•It aids in the synthesis of chlorophyll and in nitrate assimilation.
•Manganese activates fat forming enzymes.
•It functions in the formation of riboflavin, ascorbic acid,and carotene.
•It functions in electron transport during photosynthesis.
In the five kingdom system of classification, which single kingdom out of the following can include blue-green algae, nitrogen fixing bacteria and methanogenic archaebacteria ?
Excretory products of mammalian embryo are eliminated by-
Chromatin structure must be altered in order for gene expression to occur because
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Solution
Nucleosomes condense the DNA. Heterochromatin is transcriptionally inactive, while euchromatin is transcriptionally active.
Who is known as ‘Father of Taxonomy’ :
The drug useful to increase cardiovascular effects in human beings is
Transpiration ratio is the ratio of moles of H2O transpired/moles of CO2 fixed. This ratio is measure of
Chemically hormones are
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Solution
Hormones are chemical messengers formed by endocrine cells. Chemically hormones are of the following types:
Amines – composed of amino group e.g., Melatonin.
Amino acids – eg. thyroxine
Peptides – eg. insulin
Steroids – eg. aldosterone
Angiotensinogen is a protein produced and secreted by
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Solution
Angiotensinogen is a protein secreted by liver cells.
The diagram represents Miller’s experiment. Choose the correct combination of labelling.
Grassland with scattered trees is called:
Conservation is –
Which of the following is the most serious threat to biodiversity?