Write true or false. 1. Plants prepare food in the form of oxigen.
A. False
2.photosynthesis takes place in green leaves.
A. True
3.formation of starch takes place only in the presence of sunlight.
A. True
4.starch turns red on coming in contact with iodine solution.
A. False
1.The main vein of a leaf is called as midrib.
2.The tiny microscopic pores on leaves are known as stomata
3.The flat part of a leaf is called leaf blade.
Match the following
1. Mushroom------- Non green plant
2. Indian pipe------- Parasite
3. Croton -------------- Red leaves
Time to answer
1. Plants use chemical energy, water and carbon dioxide to make their food.
A. Solar energy
2.Animals and human beings breathe out water vapour and oxygen.
A. Carbon dioxide.
Let us practice
(a) The process by which plants prepare their own food is called photosynthesis.
(b) Leaves are called food factory or kitchen of green plants.
(c) chlorophyll is a green pigment found in the leaves of plants.
(a) The green colour of a leaf is due to the presence of chlorophyll. (T)
(b) During photosynthesis, carbon dioxide is released into the atmosphere (T)
(c) In sugarcane, the food prepared by the plant is stored in the stem. (T)
(d) Green plants do not require sunlight for photosynthesis. (F)
(a) gas which is a by - product in the process of photosynthesis
A. Oxygen
(b) Tiny pires on leaves that allow exchange of gases in plants
A. Stomata
(c) The storage from of food in plants
A. Starch
(d) Flat part of the leaf
A. Leaf blade
Statement1. In cactus food is prepared in the green stem.
Statement 2. Photosynthesis can take place even in the absence of chlorophyll.
Ans. (a) Statement 1
(a) why are leaves called food factory of plant?
Ans. Only green leaves which contains chlorophyll can prepare food for the plant. Therefore leaves are called the food factory or kitchen of green plants.
(b) what is the function of roots in the plants?
Ans. Roots in the plants absorb the water from the soil.
(c) what are parasitic plants?
Ans. Parasitic plants get all food from another plant or it's host plant. ex. Indian pipe
(a) Describe the structure of a leaf in detail.
Ans. The flat part of the leaf is called the leaf blade. There is a main vein running along the centre of the leaf is called midrib. It has a number of side veins. The leaf have many tiny pores called stomata. The part that cannects to leaf to the sten is called petiole. A leaf takes in carboy dioxiy and gives out oxygen and water vapour through the stomata duy the priy of photosynthesis.
(b) Why do the leaves of croton plant appear dark red?
Ans. The leaves of croton plant appear red as they have green chlorophyll, but the red coloured substance present in the leaves bides the green colour of the plant to colour of the chlorophyll.
(c) How is the balance of oxygen and carbon dioxide maintained in nature?
Ans. Animals and human beings breaths out carbon dioxide. This carbon dioxide goes in to the atmosphere and is used by green plant to prepare their food. In the process of maku food. Plants release oxygen as by product which is used by human beings and other aniy for breathing. This cycle continues maintaining the balance between carbon dioxide and oxygen in nature.
(d) why do we keep the plants in dark for 24 hours prior to photosynthesis- related experiments?
Ans. We keep the plants in dark for 24 hours prior to photosynthesis. Related experiment so as to remove starch from leaves the presence of starch can hinder in the result of the experiment.
1.ans.x- side veins
Y- petiol , z- midrib
2. Ans. Carbon dioxide is taken in and oxygen is released.
3.ans.(a) it performs photosynthesis
(b) it stores food
(c) it performs transpiration.
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