Biology
Define the following terms:
(a) Photosynthesis
(b) Thylakoids
(c) Chloroplast
(d) Photolysis of water
(e) Polymerisation
Photosynthesis
234 Likes
Answer
(a) Photosynthesis — Photosynthesis is the process by which living plant cells, containing chlorophyll, produce food substances (glucose and starch), from carbon dioxide and water, by using light energy and release oxygen as a by-product.
(b) Thylakoids — Closely packed flattened sacs arranged in piles in the interior of chloroplasts are called Thylakoids.
(c) Chloroplast — Chloroplasts are minute oval bodies bounded by a double membrane which contains Thylakoids arranged in piles called Grana lying in a colourless ground substance called Stroma.
(d) Photolysis of water — Photolysis of water is defined as the splitting of H2O molecules into hydrogen ions and oxygen in the presence of light.
(e) Polymerisation — Polymerisation is the process in which several glucose molecules are transformed to produce one molecule of starch.
Answered By
163 Likes
Related Questions
Complete the following by filling the blanks 1 to 5 with appropriate words/ terms/ phrases:
To test the leaf for starch, the leaf is boiled in water to (1) …………… . It is next boiled in methylated spirit to (2) …………… . The leaf is placed in warm water to soften it. It is then placed in a dish and (3) ………… solution is added. The region, which contains starch, turns (4) …………… and the region, which does not contain starch, turns (5) ……………… .
Write the exact location of each :
(a) Chlorophyll
(b) Chloroplast in the parts of a plant
(c) Stroma
(d) Guard cells
(e) Palisade cells
Given below is the figure of an experimental set-up, showing a physiological act of the plants. Study and answer the following questions.
(a) What is the objective of this experiment ?
(b) Name and define the process shown here.
(c) Why do we destarch the leaves before performing the experiment ?
(d) How do we destarch the leaves ?
(e) What will be the observation when we pour iodine solution over the bleached experimental leaf.
(f) Write a well-balanced equation of the above process.
Give reasons/explain:
It is necessary to place a plant in the dark before starting an experiment on photosynthesis.