Question

D. Answer the following questions in brief.
1.
Why is nutrition important for a living organism?
2.
How do green plants synthesise their food?
3.
State the role of 'vessels' present in a plant.
Define the following terms:
(a) Symbiotic relationship
(b) Nutrients
(c) Saprotrophic mode of nutrition
(d) Photosynthesis
5.
When some wheat dough was left in the open for a few days, it start
a foul smell. State, why?​

Answer 1

ANSWER:

tiger- carnivore 

cow- herbivore 

vulture- scavenger

bacteria- decomposers

deer- herbivore

goat- herbivore

human- omnivore

fungus- decopmosers

lion- carnivores

sparrow- herbivore

buffalo- herbivore

frog- carnivore

cockroach- carnivore

tick- parasite

Answer 2

Answer:

(1)Nutrients help break down food to give organisms energy. They are used in every process of an organism's body. Some of the processes are growth (building cells), repair (healing a wound), and maintaining life (breathing). Plants and other autotrophs absorb nutrients from soil and water.

(2)Photosynthesis is the process in which green plants use sunlight to make their own food. Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide gas. Chlorophyll is a substance in all green plants, especially in the leaves.

(3)Vessel elements are the building blocks of vessels, which constitute the major part of the water transporting system in those plants in which they occur. Vessels form an efficient system for transporting water (including necessary minerals) from the root to the leaves and other parts of the plant.

a)symboitic relationship-symbiotic relationship benefits both parties. In biology, symbiotic refers to any diverse organisms that live together, but in this case, the relationship is not necessarily beneficial to both. ... Parasites, for example, have a symbiotic relationship with their hosts, but only the parasite benefits

b)nutrient-A nutrient is a substance used by an organism to survive, grow, and reproduce. The requirement for dietary nutrient intake applies to animals, plants, fungi, and protists.

c) saprophytic mode of nutrition-Saprotrophic nutrition or lysotrophic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of decayed (dead or waste) organic matter. It occurs in saprotrophs, and is most often associated with fungi (for example Mucor) and soil bacteria.

d) Photosynthesis-Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

(5)The wheat dough when left in the open for a few days, starts emitting foul smell due to the action of bacteria and fungi that grow on it. These organisms are called saprotrophs which obtain food from the dead and decaying organic matter.

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