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 Multiple Choice QuestionsMultiple Choice Questions

1.

The correct sequence of cell organelles during photorespiration is

  • chloroplast - Golgi bodies - mitochondria

  • chloroplast-rough endoplasmic reticulum -dictyosomes

  • chloroplast-mitochondria-peroxisome

  • chloroplast-vacuole-peroxisome


C.

chloroplast-mitochondria-peroxisome

None of the options is correct. photorespiration required three cell organelles in sequence of chloroplast, peroxisome and mitochondria.
option (c) may be correct if be read as said sequence. 

541 Views

2.

Specialised epidermal cells surrounding the guard cells are called

  • sunbsidiary cells

  • bulliform cells

  • lenticels

  • complementary cells


A.

sunbsidiary cells

The cells surrounding the guard cells are called subsidiary cells and lack chloroplast.

1268 Views

3.

In photosynthesis, the light-independent reactions take place

  • Thylakoid lumen

  • Photosystem I

  • Photosystem II

  • Stromal matrix


D.

Stromal matrix

The light-independent reactions (or dark reactions) take place in the stromal matrix of the chloroplasts. 
In light independent reactions, carbon dioxide is reduced to glucose (carbohydrate) by the hydrogen in NADPH by using the chemical energy stored in ATP. This reaction takes place in the presence of a substance called RuDP.

878 Views

4.

A process that makes important difference between C3 and C4 plants is

  • transpiration

  • glycolysis

  • photosynthesis

  • photorespiration


D.

photorespiration

Photorespiration is a light dependent process which occurs in C3 plants. It is opposite to photosynthesis because during this process uptake of O2 and release of CO2 take place. Due to the presence of Kranz anatomy, C4 plants do not show photorespiration. 

589 Views

5.

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

  • Manganese and Chlorine

  • Manganese and Potassium

  • Magnesium and Molybdenum

  • Magnesium and Chlorine


A.

Manganese and Chlorine

Photolysis of water during photosynthesis evolve nascent oxygen in the presence of manganese, calcium and chloride ions.

1263 Views

6.

The three boxes in this diagram represent the three major biosynthetic pathways in aerobic net reactant or products



Arrows numbered 4, 8 and 12 can all be

  • NADH

  • ATP

  • H2O

  • FAD+ Or FADH2


B.

ATP

Pathway A is glycolysis, pathway B is the kerb' cycle and pathway C is oxidative phosphorylation

Arrow 1 - ADP or NAD+

Arrow 2 - Pyruvate


Arrow 3 - NADH

Arrow 4 - ATP

Arrow 5 - ADP, NAD+ or FAD

Arrow 6 and 7 - FADH2 and NADH (either one can be 6 or 7)

Arrow 8 - ATP or  CO2


Arrow 9 and 10 - O2 and ADP (either one can be 9 or 10)

Arrow 11 and 12 - H20 and ATP (either one can be 11 or 12)
1138 Views

7.

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rate of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

  • C4

  • CAM

  • Nitogen-fixer

  • C3


A.

C4

C4 plants show very little photorespiration and better utilisation of water. 

1965 Views

8.

Chromatophores take part in

  • Photosynthesis

  • Growth

  • Movement 

  • Respiration


A.

Photosynthesis

Chromatophores are found in members of phototrophic bacteria. They contain bacteriochlorophyll pigments and carotenoids and take part in photosynthesis. In purple bacteria, such as Rhodospirillum rubrum, the light-harvesting proteins are intrinsic to the chromatophore membranes. However, in green sulphur bacteria, they are arranged in specialised antenna complexes called chlorosomes. 

1990 Views

9.

Anoxygenic photosynthesis is characteristic of 

  • rhodospirlllum

  • Spirogyra

  • Chlamydomonas

  • Ulva


A.

rhodospirlllum

Anoxygenic photosynthesis (in which O2 is not released) is seen in Rhodospirillum, a purple non- sulphur bacteria. it helps an organism to trap light energy and store it as chemical energy.

1008 Views

10.

Emerson's enhancement effect and red drop have instrumental in the discovery of

  • two photosystems operating simultaneously

  • photophosphorylation and cyclic electron transport

  • oxidative phosphorylation

  • phosphorylation and non-cyclic electron transport


A.

two photosystems operating simultaneously

Emerson performed photosynthetic experiment on Chlorella. The enhancement effect is due to the presence of two photosystems PsI and PSII. 

3308 Views