Photosynthesis in Higher Plants - Online Test

Q1. Melvin Calvin use of radioactive 14C in
Answer : Option D
Explaination / Solution:

The use of radioactive C-14 by him in algal photosynthesis studies led to the discovery that the first  fixation product was a 3-carbon organic acid.

Q2. Accessory pigments protect plants from
Answer : Option C
Explaination / Solution:

Other thylakoid pigments like chlorophyll b, xanthophylls and carotenoids, which are called accessory pigments, also absorb light and transfer the energy to chlorophyll a. Indeed, they not only enable a wider range of wavelength of incoming light to be utilized for photosynthesis but also protect chlorophyll a from photo-oxidation.

Q3. The portion of ATPase enzyme that protrudes on outer surface of the thylakoid membrane on the side faces of the stroma
Answer : Option D
Explaination / Solution:

The ATPase enzyme consists of two parts: one called the  is embedded in the membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane. The other portion is called  and protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma.

Q4. Which form of carbon is absorbed by the hydrophytes through their general body surface?
Answer : Option B
Explaination / Solution:

Hydrophytes are those plants that grow in water. Hydrophytes can absorb Bicarbonates through their general body surface.

Q5. Name the photosynthetic pigment which can be converted to Vitamin A?
Answer : Option D
Explaination / Solution:

The photosynthetic pigment Beta-carotenes can be converted to Vitamin A. carrot contain large quantity of carotenes that can be converted into vitamin A.

Q6. What does  represent in plant photosynthesis?
Answer : Option D
Explaination / Solution:

The key features of plant photosynthesis were known, namely, that plants could use light energy to make carbohydratesfrom  and water, where represents glucose.

Q7. Name the central element present in chlorophyll.
Answer : Option B
Explaination / Solution:

As chlorophyll is a complex compoumd, Magnesium(Mg) is found in the centre of the structure of this compond.

Q8. Paper chromatography is technique to separate
Answer : Option D
Explaination / Solution:

Separation of leaf pigments of any green plant through paper chromatography. 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 four pigments: Chlorophyll a (bright or blue greenin the chromatogram), chlorophyll b (yellow-green), xanthophylls (yellow) and carotenoids.

Q9. The substances like ATP carry energy in
Answer : Option D
Explaination / Solution:

Living organisms have the capability of extracting energy from oxidisable substances and store this in the form of bond energy. Special substances like ATP, carry this energy in their chemical bonds.

Q10. The stroma of chloroplast contains
Answer : Option D
Explaination / Solution:

In stroma, enzymatic reactions incorporate  into the plant leading tothe synthesis of sugar, whichare not directly light driven but are dependent on the products of light reactions (ATP and NADPH). Hence, to distinguish the latter they are called, by convention, as dark reactions. However, this should not be construed to mean that they occur in darkness or that they are not lightdependent.