Biology GK · all questions

Plant Anatomy and Physiology
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Q221

Consider the following statements and choose the correct answer:
1. The integuments of the ovule become dry and firm, the seed coat
2. Insoluble food is formed in the ovule as a result of dehydration
3. In endospermic seeds the insoluble food is stored in cotyledons
4. The ovary wall forms the fruit wall which may be hard or fleshy

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Q222

In the photosynthetic purple bacteria, the phototactic movements shown by them seem to be due to light absorbed by

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Q223

Who among the following has called a frontier or flat-earth concept of the world instead of spaceship or round-world view?

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Q224

Oxygen, which is liberated during photosynthesis comes from

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Q225

Except which of the following steps, in all other steps the pair of electrons, released in respiration, reduces NAD⁺ to NADH ?

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Q226

When the water is trickling downwards due to gravity, a portion of the water is retained around and between the soil particles due to surface tension. This water is known as

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Q227

The uredospore stage of Puccinia is called the

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Q228

Which of these is a micronutrient for plants?

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Q229

Consider the following statements regarding tobacco mosaic viruses and choose the correct answer:
1. Tobacco mosaic viruses are sap transmissible
2. These can stand a high degree of dilution
3. Breaking of a hair with contaminated instrument serves as a means of transmitting the virus
4. These viruses are insect borne

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Q230

Red-rot of sugarcane was first observed by

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Q231

In alfalfa, cold sensitive cultivars are

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Q232

The most suitable temperature for citrus canker appears to be

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Q233

The green colour of the leaves is due to the presence of

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Q234

Which one of the following does not increase the amount of carbon dioxide in carbon cycle on earth?

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Q235

The first stage in the process of fermentation is the

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Q236

Atmospheric diffusion of air is minimal at elevations above

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Q237

The only plant cells without nuclei among the following are

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Q238

Example of plants which require vernalisation is/are

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Q239

The microbes which are essential for the conversion of ammonium salts to nitrate have been isolated first by

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Q240

The species that dominate in upper Rhododendron zone up to the timber line include

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