GSEB Solutions for Class 7 Science and Technology – Constitutes of Diet (English Medium)
GSEB SolutionsMathsScience
Exercise 20:
Solution 1(a):
The roots of carrot and radish are fleshy because they are modified into different structures which carry out specific functions like food and water storage.
Solution 1(b):
Sweet potato, Turnips and Ginger are examples of food storing roots.
Solution 1(c):
The stilt roots grow obliquely from the lower nodes of the stem of plants towards the soil and fix the plant properly. It also supports the plant body against wind like the ropes of a tent. For example- Mangroves, Pandanus, Maize, Sugarcane
Exercise 22:
Solution 1(a):
The leaves arising from tubers are the modified stem arising from the nodes of the potato.
Solution 1(b):
Potato is a stem because it is the underground part of the stem that has thickened which is called the tuber.
Exercise 23:
Solution 1(a):
Ginger, Turmeric and Onion are examples of food storing underground stems.
Solution 1(b):
A tendril is a modified stem, leaf, or petiole. They are typically more round than flat and function to hold the plant up as it grows.
Solution 1(c):
Bitter gourd, Pea and Grapevine show stem tendrils.
Exercise 24:
Solution 1(a):
The lime water evaporates from the bag.
Solution 1(b):
The leaf does not have a supply of carbon dioxide from the air because lime water absorbs carbon dioxide which shows that carbon dioxide is needed for photosynthesis.
Exercise 25:
Solution 1(a):
Most trees and plants evaporate and exhale water from pores in their leaves during the day, while they are photosynthesizing. This evaporation cools the leaves and the air around the tree.
Solution 1(b):
The colour of the leaf will be pale-yellow.
Exercise 26:
Solution 1(a):
The colour of the leaf goes away when the strips are tied because of the absence of sunlight as sunlight is necessary for the plants to survive.
Solution 1(b):
Without strips, the colour of the leaf will remain unchanged owing to the presence of sunlight.
Solution 1(c):
Light is essential for photosynthesis to be carried out.
Solution 1(d):
The animals do not show photosynthesis because they are heterotrophs (depend on other sources for food). Plants however, get their energy from the sun, so, they use the Sun and carbon dioxide to form oxygen and glucose.
Exercise 27:
Solution 1(a):
Leaves are called the kitchen of the plant because they produce their own food which is utilized by the whole plant.
Exercise 28:
Solution 1(a):
Like animals and human beings, plants also need to perform specific functions in order to grow and survive. The various parts of the trees perform different functions. Stem, Roots, Leaves all together perform specific functions.
- The stem holds the plant upright and conducts water and minerals and also carries prepared food from the leaves to the other parts.
- The roots fix the plant to the soil and absorb minerals and water from the soil.
- The leaves are that important component of the plant which is responsible for the manufacturing of food by the process of photosynthesis.
Solution 1:
Solution 2:
Yes the colour of the flower changes according to the solution. The stem of the twig contains narrow tubes for transportation of water and minerals to other parts of the plant making the colour change in the flower.
Solution 3:
T.S of a monocot plant:
