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Puucho STATIC QUIZ 2020 – 21
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Question 1 of 5
Which of the following plant micronutrients is associated with chlorophyll formation in plants?
- Iron
- Copper
- Magnesium
Select the correct answer code:
CorrectSolution: d)
Magnesium forms a part of the chlorophyll molecule – essential in photosynthesis.
Iron is taken up in ferrous and ferric forms by plants. It acts as a catalyst in the production of chlorophyll.
Cu+2 (copper) can be absorbed through leaves. It becomes very toxic if too much applied. It is also a catalyst in chlorophyll formation.
IncorrectSolution: d)
Magnesium forms a part of the chlorophyll molecule – essential in photosynthesis.
Iron is taken up in ferrous and ferric forms by plants. It acts as a catalyst in the production of chlorophyll.
Cu+2 (copper) can be absorbed through leaves. It becomes very toxic if too much applied. It is also a catalyst in chlorophyll formation.
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Question 2 of 5
Consider the following statements.
- Coniferous trees are most desirable as pulpwood.
- Shorter the cellulose fiber in the pulp of a tree, the more desirable it is for making paper.
Which of the above statements is/are correct?
CorrectSolution: a)
The timber resources used to make wood pulp are referred to as pulpwood. While in theory, any tree can be used for pulp-making, coniferous trees are preferred because the cellulose fibers in the pulp of these species are longer, and therefore make stronger paper.
Some of the most commonly used softwood trees for paper making include spruce, pine, fir, larch and hemlock, and hardwoods such as eucalyptus, aspen and birch.
IncorrectSolution: a)
The timber resources used to make wood pulp are referred to as pulpwood. While in theory, any tree can be used for pulp-making, coniferous trees are preferred because the cellulose fibers in the pulp of these species are longer, and therefore make stronger paper.
Some of the most commonly used softwood trees for paper making include spruce, pine, fir, larch and hemlock, and hardwoods such as eucalyptus, aspen and birch.
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Question 3 of 5
Phytoplankton are generally found in upper layers of ocean water because of
- Abundant sunlight in the upper layer of ocean water
- Absence of nutrients in deep ocean water
Select the correct answer code:
CorrectSolution: a)
Phytoplankton in the open ocean need both sunlight and nutrients (such as nitrate and phosphate) to be able to photosynthesize.
- Abundant Sunlight is available in the uppermost layers.
- During photosynthesis, the nutrients are quickly used up by phytoplankton so they are not available for long periods in the upper layers under normal circumstances.
This is indeed the case in tropical waters, and as a result they are very unproductive.
- To escape this problem the seawater needs to be mixed regularly to bring the nutrient rich deep waters up to the sunlight zone where the phytoplankton can grow.
IncorrectSolution: a)
Phytoplankton in the open ocean need both sunlight and nutrients (such as nitrate and phosphate) to be able to photosynthesize.
- Abundant Sunlight is available in the uppermost layers.
- During photosynthesis, the nutrients are quickly used up by phytoplankton so they are not available for long periods in the upper layers under normal circumstances.
This is indeed the case in tropical waters, and as a result they are very unproductive.
- To escape this problem the seawater needs to be mixed regularly to bring the nutrient rich deep waters up to the sunlight zone where the phytoplankton can grow.
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Question 4 of 5
Consider the following statements regarding plant pathogens.
- Bacteria as well as virus can cause diseases in plants.
- Pathogen transmission cannot happen by the medium of water.
- Pathogens can affect plants only after transmitting itself from the root to the shoots.
Which of the above statements is/are correct?
CorrectSolution: b)
Pathogens can transmit themselves through all three modes – air, water and soil.
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Question 5 of 5
Photoperiodism is a phenomenon related to
CorrectSolution: b)
Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals.
- It has been observed that some plants require a periodic exposure to light to induce flowering. It is also seen that such plants are able to measure the duration of exposure to light.
- For example, some plants require the exposure to light for a period exceeding a well defined critical duration, while others must be exposed to light for a period less than this critical duration before the flowering is initiated in them.
- Together with temperature changes, photoperiod provokes changes in the colour of fur and feathers, migration, entry into hibernation, sexual behaviour etc. For e.g. the singing frequency of birds such as the canary depends on the photoperiod.
IncorrectSolution: b)
Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals.
- It has been observed that some plants require a periodic exposure to light to induce flowering. It is also seen that such plants are able to measure the duration of exposure to light.
- For example, some plants require the exposure to light for a period exceeding a well defined critical duration, while others must be exposed to light for a period less than this critical duration before the flowering is initiated in them.
- Together with temperature changes, photoperiod provokes changes in the colour of fur and feathers, migration, entry into hibernation, sexual behaviour etc. For e.g. the singing frequency of birds such as the canary depends on the photoperiod.
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