Question

Photosynthesis is a biochemical process that allows autotrophic organisms to convert _____ energy into the _____ energy of organic molecules such a _____, a carbohydrate. Photosynthesis occurs in the _____, a double membrane organelle found in autotrophic organisms. Photosynthesis consists of the _____ reaction and the dark reaction. The _____ reaction occurs in the while the dark reaction occurs in the _____. The main pigment involved in photosynthesis are organized into clusters called _____ and _____. What is the cyclic flow of electrons important? _____ The Calvin cycle consists of three places, _____ The production of ATP during photosynthesis is called _____

Answer 1

Photosynthesis is a biochemical process:

1. ANS: Solar Energy, Bio chemical Energy, Glucose.

2. ANS: Chloroplast

Chloroplast is a green plant cells which contains chlorophyll and in which photosynthesis takes place.

3. ANS: Light reactions , Light reactions , stroma.

Light reactions need light to produce organic energy molecules (ATP and NADPH). They are initiated by colored pigments, mainly green colored chlorophylls.

Dark reactions make use of these organic energy molecules (ATP and NADPH). This reaction cycle is also called Calvin Benison Cycle, and it occurs in the stroma.

4. ANS: Chlorophyll

Chlorophylla-a is the primary pigment for photosynthesis in plants, but the range of light absorption is extended by chlorophyll-b, beta-carotene and other accessory pigments.

5 ANS: photosystem 1 and photosystem 2

6. ANS: Water, Co2 , NADP

Photosynthetic electron transport can involve either a linear flow from water to NADP, via Photosystems (PS) II and I or a cyclic flow just involving PSI.

7. ANS: Cyclic electron flow around photosystem I is essential for photosynthesis. Photosynthesis provides at least two routes through which light energy can be used to generate a proton gradient across the thylakoid membrane of chloroplasts, which is subsequently used to synthesize ATP.

Process by which light energy absorbed by photosystem I in the chloroplast can be used to generate ATP without concomitant reduction of NADP or other electron acceptors. Energised electrons are passed from PS I to ferredoxin and thence along a chain of electron carriers and back to the reaction center of PS I, generating ATP en route. This ATP is then used (with NADPH) in the Calvin Cycle to convert 3-phosphoglycerate to 3-phosphoglyceraldehyde

8. ANS: three stages of the calvin cycle:

1. fixation
2. reduction
3. regeneration

9. ANS: Light Phase Reactions

the "Light Phase Reactions" of photosynthesis, which produce two high energy chemical products, namely NADPH and ATP

10. ANS: chlorophyll

Leaves contain chlorophyll and are the sites of photosynthesis in plants. The cells of a leaf are sandwiched in between two layers of epidermal cells