Question

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 a alga and this 'partnership' is beneficial to both.

Answer 1

Answer:

A› Mushrooms are considered to be saprotrophs as they grow on dead and decaying matter and obtain nourishment from it by secreting digestive juices. ... Saprotrophs are the plants that obtain their nutrition from dead and decaying organic matter.

B› The sun is called the ultimate source of energy because it is the source of almost all energies of the earth. Plants convert light energy from the sun into chemical energy (food) by the process of photosynthesis. Animals eat plants and use that same chemical energy for all their activities.

C›The stomata are the pores surrounded by guard cells which help plant to take in carbon dioxide and take out Oxygen. This is so because when the stomata was blocked the plant was unable to take in carbon dioxide and hence unable to perform photosynthesis.

D›The leaf has chlorophyll which gives the green color to the leaf. Chlorophyll makes food for the plant using carbon dioxide, water, nutrients, and sunlight.

E›Lichen is a living partnership between a fungus and algae because the algae present in the relationship produces food whereas the fungus present in the relationship provides shelter to the entire group.

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