Biology GK · all questions

Plant Anatomy and Physiology
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Q181

Many of the germination inhibitors may be leached out of one plant and may inhibit the growth or seed germination of a plant from another species. Plants that exhibit this kind of competitive behaviour are said to be

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Q182

Before maturation, each crop plant requires a certain number of "etfective heat units" - this is called

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Q183

Coenzyme Q (CoQ) functions as a mobile electron carrier between

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Q184

Which of the following are examples of kharif crops?

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Q185

At the time of germination the exosporium ruptures and the endosporium grows out in the form of a short tubular hyphae, called the

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Q186

The formation of 3-PGA from glycolic acid, glyoxylic acid, glycine and serine is referred to as

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Q187

Maximum germination is achieved if

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Q188

In which part of the female flower does fertilisation take place?

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Q189

In which of the following plants, the pollen grains do not separate apart but remain adhered in tetrad to form "Compound pollen grains"?

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Q190

Why are dark reactions called so?

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Q191

Which of the following is the component of water potential influenced by the presence of a matrix?

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Q192

By which of the following means of adaptation the animals orient themselves to face into current and move upstream?

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Q193

The ocean is continuous throughout the world except for the deep water of the

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Q194

Consider the following statements and choose the correct answer:
1. In order to increase the photosynthetic efficiency leaf area index should be increased
2. To increase leaf area index plants should be with horizontal leaves
3. If the time of grain-growth is increased, the grain-yield will decrease
4. Photosynthetic efficiency can be increased by monitoring moisture stress, transpiration loss and light intensity

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Q195

The pressure imposed on a lake-dwelling organism is

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Q196

If we subject a plant to continuous red light, the level of phytochrome in the plant

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Q197

Consider the following statements and choose the correct answer:
1. Roots of grasses are an excellent binding material and keep the soil intact
2. Disruption of the grass cover by the plough loosens the soil and makes it vulnerable to removal by the force of rain or strong winds
3. Tilling or grazing on slopes or semi-arid soils decreases the rate of soil erosion
4. Soil erosion is especially high in Nepal, India, China, Australia, Spain, USSR, USA and Central Africa

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Q198

The ratio of energy flowing between various trophic levels are expressed as

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Q199

As the male gametes in angiosperms have to travel through the pollen tube to reach the egg, the process of sexual fusion is called

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Q200

Which of the following is a copper-containing protein?

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