Q23. What are nutrients?
Carbohydrates, proteins, fats, vitamins and minerals are components of food.
components of food are called nutrients.
Q24. What is chlorophyll?
A green pigment present in all green plants which helps leaves to capture the
energy of the sunlight is called chlorophyll.
Q25. Where and in what conditions do fungi grow?
Fungi grow on pickles, leather, clothes and other articles that are left in hot
and humid weather for long time.
Q26. How do fungi grow and develop?
The fungal spores are generally present in the air. When they land on wet and
warm things they germinate and grow.
Q27. Why algae are green in colour?
They contain chlorophyll which gives them the green colour. Algae can also
prepare their own food by photosynthesis.
Q28. What are the raw materials required for photosynthesis?
Chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the
process of photosynthesis.
Q29. Do insectivorous plants perform photosynthesis?
Insectivorous plants got leaves therefore they can photosynthesis, which means
they can prepare their food in the presence of sunlight.
Q30. What are algae?
We often see slimy, green patches in ponds or in other stagnant water bodies.
These are generally formed by the growth of organisms called algae.
Q31. Why do organisms need to take food?
The food enables living organisms to build their bodies, to grow, to repair
damaged parts of their bodies and provide the energy to carry out life processes.
Q32. Why plants such as pitcher plant do not get all the
required nutrients from the soil in which they grow?
Plants such as pitcher plant do not get all the required nutrients from the
soil in which they grow because they are deficient in nutrients such as
Q33. What is Cuscuta?
is a parasitic plant. It is yellow tubular structures twining around the stem
and branches. It does not have chlorophyll. It takes readymade food from the
plant on which it is climbing.
Q34. What is the role of rhizobium bacteria in leguminous plant?
The bacterium called Rhizobium present in leguminous plant can take atmospheric
nitrogen and convert it into a soluble form. Thus help in nitrogen fixation.
Q35. Some plants have deep red, violet or brown leaves. Do these
leaves also carry out photosynthesis?
The leaves other than green also have chlorophyll. The large amount of red, brown
and other pigments mask the green colour. Photosynthesis takes place in these
Q36. What is so special about the leaves that they can synthesis
food but other parts of the plant cannot?
The leaves have a green pigment called chlorophyll. It helps leaves to capture
the energy of the sunlight. This energy is used to synthesis (prepare) food
from carbon dioxide and water.
Q37. How would you test the presence of starch in leaves?
Iodine solution is used to test leaves for the presence of starch.
– Remove chlorophyll by boiling it in alcohol and then add 2 drops of iodine
solution. If the color changes to blue, indicates the presence of starch in the
Q38. How do plants obtain the raw materials from the surroundings?
Water and minerals present in the soil are absorbed by the roots. Carbon
dioxide from air is taken in through the tiny pores present on the surface of
the leaves. The leaves have a green pigment called chlorophyll. It
helps leaves to capture the energy of the sunlight.