PHOTOSYNTHESIS IN HIGHER PLANTS-I

_________ showed that sunlight is essential to the plant process that somehow purifies the air fouled by burning candles or breathing animals as demonstrated in the experiment conducted by Joseph Priestley.

• Jan Ingenhousz

• T.W Engelmann

• Julius von Sachs

• Blackmann

T.W Engelmann split light into its spectral components using a prism and then illuminated a green alga, _________, placed in a suspension of aerobic bacteria.

• Chlamydomonas

• Cladophora

• Chlorella

• Desmids

In _________, enzymatic reactions incorporate CO2 into the plant leading to the synthesis of sugar, which in turn forms starch.

• Matrix of mitochondria

• Stroma of chloroplast

• Intermembrane space of mitochondria

• Grana of chloroplast

The former set of reactions in photosynthesis that are directly light driven are called _________.

• Biosynthetic phase

• Dark reactions

• Light reactions

• Synthesis phase

A chromatographic separation of the leaf pigments shows that the colour that we see in leaves is not due to a single pigment but due to

• Chlorophyll a

• Chlorophyll b

• Xanthophylls and carotenoids

• All the above

Photochemical phase of photosynthesis includes _________.

• Light absorption

• Water splitting

• Oxygen release

• All the above

Assertion : Chloroplasts occur inside the leaves mostly in mesophyll cells along their walls.

Reason :The membrane system of chloroplast is responsible for trapping the light energy and also for the synthesis of ATP and NADPH.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

• Assertion is true but Reason is false

• Both Assertion and Reason are false

Assertion: The colour of the leaf is due to the presence of four pigments-chlorophyll a, chlorophyll b, xanthophylls and carotenoids.

Reason: Chlorophyll b is the chief pigment associated with photosynthesis.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

• Assertion is true but Reason is false

• Both Assertion and Reason are false

Assertion : The stroma lamellae have both PS I and PS II.

Reason :The grana lamellae lack PS II as well as NADP reductase enzyme.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

• Assertion is true but Reason is false

• Both Assertion and Reason are false

Assertion : Dark reactions are called biosynthetic phase of photosynthesis.

Reason :Dark reactions do not directly depend on the presence of light but are dependent on the products of the light reaction, i.e. ATP and NADPH.

• Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

• Assertion is true but Reason is false

• Both Assertion and Reason are false