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Draw a standard ECG and explain the different segments in it.
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Give the diagrammatic representation of ETS
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Which bacteria oxidise various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for their ATP production?
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Polluted water bodies have usually very high abundance of plants like Nostoc and Oscillitoria. Give reasons.
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Apart from chlorophyll, algae have several other pigments in their chloroplast. What pigments are found in blue-green, red and brown algae that are responsible for their characteristic colours?
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Heterospory i.e., formation of two types of spores – microspores and megaspores is a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes. Do you think heterospory has some evolutionary significance in plant kingdom?
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How far does Selaginella one of the few living members of lycopodiales (pteridophytes) fall short of seed habit.
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The heterosporous pteridophytes show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain.
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How are the male and female gametophytes of pteridophytes and gymnosperms different from each other?
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Gametophyte is a dominant phase in the life cycle of a bryophyte. Explain.
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A piece of wood having no vessels (trachea) must belong to ______.
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Protoxylem is the first formed xylem. If the protoxylem lies next to phloem what kind of arrangement of xylem would you call it?
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Distinguish between the following:
Exarch and endarch
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Match the following with reference to cockroach and choose the correct option
| Column I | Column II |
| A. Hermaphrodite | i. Produces blood cells and haemoglobin |
| B. Direct development | ii. Testis and ovary in the same animal |
| C. Chemoreceptor | iii. Larval form absent |
| D. Blood gland in earthworm | iv. Sense of chemical substances |
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Why earthworm is called the friend of farmer?
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Correct the wrong statement from the following:
Muscular layer in the body wall of earthworm is made up of only circular muscles.
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Correct the wrong statement from the following:
Typhlosole is the part of intestine of earthworm.
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Why nephridia in earthworm that are basically similar in structure classified into three types? Mention the names of each.
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Comment upon the gametic exchange in earthworm during mating.
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