Q3 of 70 Page 73

Fill in the blanks with the appropriate answer from the choices given in the brackets.

(a) The site of light reaction in the cells of a leaf is ..................(cytoplasm, stroma, grana).


(b) The chemical substance used to test the presence of starch in the cell of a leaf is............... (CaCl2, iodine solution, Benedict solution).


(c) Stroma is the ground substance in ............... (cytoplasm, chloroplast, ribosomes).


(d) The dark reaction of photosynthesis is known as............... (Hill reaction, cyclic phosphorylation, Calvin cycle).


(e) In the flowering plants, food is transported in the form of ........................... (sucrose, glucose, starch).

(a) The site of light reaction in the cells of a leaf is grana.


Explanation: The site of light reaction in photosynthesis is the thylakoids (closely packed flattened sacs) that are arranged in piles (grana).


(b) The chemical substance used to test the presence of starch in the cell of a leaf is Iodine


Explanation: When iodine is added to a solution containing starch, that region will be indicated by a blue-black colour. Iodine is used as it changes colour in the presence of starch.


(c) Stroma is the ground substance in Chloroplast


Explanation: The thylakoids arranged in piles (grana) lie in a colourless ground substance called stroma. These are a part of the interior of the chloroplast.


(d) The dark reaction of photosynthesis is known as Calvin Cycle


Explanation: The dark reaction cycle was discovered by Melvin Calvin. Thus, the cycle is named after him.


(e) In the flowering plants, food is transported in the form of Sucrose


Explanation: Food is transported in the form of sucrose as it is more water soluble and energy efficient compared to glucose and starch.


More from this chapter

All 70 →
2

Identify the false statements and rewrite them correctly by changing the first or the last word only.

Green plants perform photosynthesis.

 2

Identify the false statements and rewrite them correctly by changing the first or the last word only.

Algae are autotrophs.

 4

Are the following statements true or false? Give reason in support of your answer.

(a) The rate of photosynthesis continues to rise as long as the intensity of light rises.


(b) The outside atmospheric temperature has no effect on the rate of photosynthesis.


(c) If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesize in bright sunshine.


(d) Destarching of the leaves of a potted plant can occur only at night.


(e) The starting point of carbon cycle is the release of CO2 by animals during respiration.


(f) If a plant is kept in bright light all the 24 hours for a few days, the dark reaction (biosynthetic phase) will fail to occur.


(g) Photosynthesis is considered as a process supporting all life on earth.

 5

Given below are five terms. Rewrite the terms in the correct order so as to be in logical sequence with regard to photosynthesis: (i) water molecules, (ii) oxygen, (iii) grana, (iv) hydrogen and hydroxyl ions, (v) photons.