What do you understand by parasitic plants? Why are some plants called parasites? What do you understand by a host?

Read the passage and answer the questions that follow:

Chlorophyll

Chlorophyll is the magic compound that can grab sunlight and start the whole process of photosynthesis. Chlorophyll is a photoreceptor and quite a varied compound. There are four types: a, b, c and d. Chlorophyll is the green pigment which imparts colouration in leaves. Chlorophyll can also be found in many microorganisms and even some prokaryotic cells. However, as far as plants are concerned, the chlorophyll is found in the chloroplasts. As the chlorophyll in leaves decays in the autumn season, the green colour fades and is replaced by the oranges and reds of carotenoids. The other big molecules are water (H2O), carbon dioxide (CO2), oxygen (O2) and glucose (C6H12O6). Carbon dioxide and water combine with light to create oxygen and glucose. Then the glucose is used in various forms by every creature on the planet.

1. What is chlorophyll?
2. How many types of chlorophyll are there?
3. Chlorophyll is also called a _____.
4. Why leaves are green in colour?
5. Why some leaves turn orange or red in colour?
6. Name the other big molecules which are involved in the process of photosynthesis.