Tag: biology

Questions Related to biology

If $^{14}CO _2$ is added to a suspension of photosynthesizing chloroplasts, which of the following will be the first compound to be radioactive?

biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

  1. ATP

  2. NADPH

  3. NADH

  4. $3$-phosphor glycerate

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Correct Option: D

Which one of the following options is true in photsynthesis.

biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

  1. $CO _2$ is oxidized and $ H _2O $ is reduced

  2. $H _2O $is oxidized and $CO _2 is reduce d$

  3. Both $CO _2$ and $H _2O$ are reducedd

  4. Both $CO2$ and$ H2O$ are oxidized

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Correct Option: B

With reference to photosynthesis in chloroplasts, consider the following statements.
a. The reactions that break down water and produce oxygen are located on the lumen side of the thylakoid membrane, in granum areas.
b. The molecules of ferredoxin-NADP re-educate that generate NADPH are located on the side of the membrane facing stroma.
Which of the statements given is/are correct?

biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

  1. $1$ only

  2. $2$ only

  3. Both $1$ and $2$

  4. Neither $1$ nor $2$

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Correct Option: A

Which of the following pairs are correctly matched? Principal wavelength Physiological of light event.
a. $700$nm- Photo system I
b. $650$nm- Photo system II
c. $690$nm- Photo system III
d. $620$nm- Phycocyanin
Select the correct answer using the codes given.

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

  1. $1, 2$ and $4$

  2. $1, 3$ and $4$

  3. $2$ and $4$

  4. $1$ and $3$

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Correct Option: A

When one molecule of $NADP^{+}$ is reduced how many water molecule split in to $H^{+}$ and $[O]$?

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

  1. Two

  2. Three

  3. One

  4. Four

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Correct Option: A

When only light of wavelength beyond $680\ mm$ are available then which of the following is not occur?

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

  1. Absorption of light

  2. Formation of ATP

  3. Release of $O _{2}$

  4. Excitetion of electron

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Correct Option: A

Match column I with column II and select the correct option from the given codes

 Sr. no  Column I  Sr.no Column II 
 A.  $C _4$ plant  i.  Succulents
 B.  Chlorophyll $b$  ii.  Accessory photosynthetic pigment
 C.  PS II  iii.  Photooxodation of $H _2O$
 D.  CAM  iv.  Kranz anatomy 

.


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

  1. A - (iv), B - (ii), C - (iii), D - (i)

  2. A - (iii), B - (ii), C - (iv), D - (i)

  3. A - (i), B - (iii), C - (ii), D - (iv)

  4. A - (i), B - (ii), C - (iii), D - (iv)

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Correct Option: A
Explanation:

(A) C$ _4$ plant - Kranz anatomy 

(B) Chlorophyll b - Succulents
(C) PS II - Photooxidation of water
(D) CAM - Accessory photosynthetic pigment
So, the correct answer is (a).

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?

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

  1. (i) and (iv)

  2. (iii) and (iv)

  3. (ii) only

  4. (i) only

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Correct Option: D
Explanation:

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

So the correct option is D.

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

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

  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

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Correct Option: A

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

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

  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.

Show answer
Correct Option: B
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'.