Very short answer type questions - 1 mark
1. Which structure in a green plant controls the opening and closing of stomata?
2. What is the principal source of energy input to biological systems?
3. Fungi does not contain chlorophyll to synthesize their food. Then how do they get their food?
4. What is the function of root nodules in leguminous plants?
5. What role does the insect play in the insectivorous plant?
6. Name a parasitic plant.
Short answer type questions - 3 marks
1. Plants are considered an essential part of earth as they keep a check on lot of process occurring all over. What
would happen if all the green plants are wiped from earth?
2. Different modes of nutrition has been observed in plants. What are they? Give example of each
3. Define the following terms
a)Symbiotic relationship
b)Nutrients
c)saprotrophic mode of nutrition
Long answer type question -5 mark
1. Describe the process by which plants prepare their food using different raw materials.
2. Describe the method for replenishing the soils with minerals and other essential constituents used by plants
growing in those soil by farmers.
3. Give reasons for the following:
a) Mushroom is a saprotroph.
b) Sun is the ultimate source of energy for all living organisms.
c)The leaf of a plant 'dies out if its stomata are blocked.
d)Leaf is known as the food factory of the plant.
e) Lichen is a 'living partnership between a fungus and an algae and this partnership is beneficial to
both.
Answers
Answer:
Plants obtain food in two different ways. Autotrophic plants can make their own food from inorganic raw materials, such as carbon dioxide and water, through photosynthesis in the presence of sunlight. Green plants are included in this group. Some plants, however, are heterotrophic: they are totally parasitic and lacking in chlorophyll. These plants, referred to as holo-parasitic plants, are unable to synthesize organic carbon and draw all of their nutrients from the host plant.
Plants may also enlist the help of microbial partners in nutrient acquisition. Particular species of bacteria and fungi have evolved along with certain plants to create a mutualistic symbiotic relationship with roots. This improves the nutrition of both the plant and the microbe. The formation of nodules in legume plants and mycorrhization can be considered among the nutritional adaptations of plants. However, these are not the only type of adaptations that we may find; many plants have other adaptations that allow them to thrive under specific conditions.
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