Tag: chloroplast and pigments of photosynthesis

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Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments

Following table summarises the differences between light reaction and dark reaction. 

Light reaction     Dark reaction      
i These arealso called as biosynthetic phase These are also calledas photochemicalphase
ii These reactionoccur over thylakoids. These reaction occur in stroma of chloroplasts.
iii These produce assimilatory power i.e.$NADPH _{2}$and ATP  These consume $NADPH _{2}$ and ATP.
iv  These are directiondependent uponlight. These depend upon the products synthesisedduring light reaction

Which of the above pairs of difference is/are incorrect?

  1. (i) and (iv)

  2. (iii) and (iv)

  3. (ii) only

  4. (i) only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The light reaction is also called as photochemical phase whereas dark reaction is called as biosynthetic phase.

So the correct option is D.

Multiple choice biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Consider following statements A & B
A - The enzyme acts on 'N' terminal of polypeptide chain
B - The enzyme acts on 'C' terminal of a polypeptide chain
Choose the correct option w.r.t the digestive juices which contain these enzymes

  1. A- Succus entericus B - Pancreatic juice

  2. A - Intestinal juice B - Bile juice in duodenum

  3. A - Pancreatic juice B - Intestinal juice

  4. A - Intestinal juice B - Gastric juice
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carboxypeptidases (C-terminal) are found in pancreatic juice. Aminopeptidases (N-terminal) are found in intestinal juice (succus entericus).

Multiple choice biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Why does the total amount of $CO _2$ in the atmosphere remains constant even though respiration liberates $CO _2$?

  1. $CO _2$ acts as a buffer
  2. $CO _2$ is converted to carbohydrates in photosynthesis
  3. $CO _2$ forms carbonic acid
  4. $CO _2$ undergoes cleavage during photosynthesis.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Most organisms release or exhale $CO _2$ during respiration. This $CO _2$  present in the environment is utilized by plants in the process of photosynthesis with the final product being a carbohydrate. This is how the amount of $CO _2$  in the atmosphere is kept under check.
So, the correct answer is '$CO _2$  is converted to carbohydrates in photosynthesis'.