3. How would you test the presence of starch in leaves?
4. Give a brief description of the process of synthesis of food in green plants.
5. Show with the help of a sketch that the plants are the ultimate source
of food.
6. Fill in the blanks:
(a) Green plants are called
their own food.
since they synthesise
(b) The food synthesised by the plants is stored as
(c) In photosynthesis solar energy is captured by the pigment called
(d) During photosynthesis plants take in
release
and
7. Name the following:
(i) A parasitic plant with yellow, slender and tubular stem.
(ii) A plant that has both autotrophic and heterotrophic mode of nutrition.
(iii) The pores through which leaves exchange gases.
Answers
ANS 3 : Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)
_____________________
ANS 4 : The process by which plants make food is photosynthesis. 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.
____________________
ANS 5 : The food chain shows that the plant is the ultimate producer.
_____________________
ANS 6 :
A. autotrophs
B. starch
C. chlorophyll
D. carbon dioxide, oxygen
_____________________
ANS 7 :
(i) Cascuta
(ii) Insectivorous plants
(iii) Stomata
_____________________
HOPE THIS WILL HELP YOU...PLZ MARK AS BRAINLIST...... FOLLOW ME ALSO...PLZZZZZZZZZ
