Respiration In Plants

Question 1

Term respiration was given by

Answer 1

Dutrochet.

Question 2

Respiration is 
1️⃣Exergonic cellular process
2️⃣Amphibolic process 
3️⃣Multi step enzymatic process
4️⃣All of these

Answer 2

All of these.

Question 3

What is floating respiration?

Answer 3

When respiratory substrates are stored carbohydrates (like glycogen, starch, sucrose, hexose or fats or proteins).

Question 4

What is protoplasmic respiration?

Answer 4

When proteins(structural or enzymatic ) are oxidized.
* it is the respiration of starved cells.

Question 5

Oxidation of proteins in legumes is
1️⃣Floating respiration
2️⃣Protoplasmic respiration

Answer 5

Floating respiration.
# Usually when proteins are oxidised it’s called protoplasmic respiration.but when stored carbohydrates which include proteins are used its called floating respiration.
    So, exceptionally, in legumes also STORED PROTEINS are oxidized therefore floating respiration.

Question 6

Floating respiration occurs in

Answer 6

When;
Mustard respire by stored oils.
Cereals by proteins.

Question 7

Protoplasmic respiration occurs in

Answer 7

When;
Mustard respire through proteins .
Cereals by lipids.

Question 8

Most commonly used substrate is

Answer 8

Glucose.

Question 9

Glycolysis occurs in

Answer 9

Cytoplasm (or cytosol)

Question 10

Glycolysis is known as EMP pathway. Why?

Answer 10

Scheme of glycolysis was given by 3 scientists;

Embden, Mayerhof & Parnas =EMP

Question 11

Glycolysis consists of 10 rxns. Name these in order.

Answer 11

1. Phosphorylation of glucose
2. Isomerisation
3. Phosphorylation of fructose-6-phosphate
4. Splitting
5. Isomerisation
6. Oxidative phosphorylation
7. Substrate level phosphorylation
8. Isomerisation
9. 9th step=enolase wala step
10. Substrate level phosphorylation

Question 12

Preparatory phase includes first ____ reactions.

Answer 12

First 4 rxns upto splitting one.

Question 13

What’s oxidative phosphorylation?

Answer 13

Glyceraldehyde-3-phosphate is oxidised through the removal of hydrogen & addition of phosphate from inorganic source I.e H3PO4 in presence of glyceraldehyde-3-phosphate dehydrogenase.
This step is k/a oxidative phosphorylation.

Question 14

Enolase is inhibited by _________.

Answer 14

Fluoride.

Question 15

Oxidative phosphorylation can be inhibited by

Answer 15

Iodoacetate.

Question 16

In glycolysis reaction___,___,___&___ are reversible.

Answer 16

1,3,7,10.

Question 17

__________is considered the connecting link between glycolysis & kreb’s cycle.

Answer 17

Acetyl-co-A

Question 18

Write link rxn or gateway rxn or oxidative decarboxylation of pyruvic acid.

Answer 18

Pyruvic acid, a 3 carbon compound, gets converted into Acetylene-co-A, a 2 carbon compound + CO2 in presence of co enzymes(Mg2+,lipoic acid,tpp, pyruvate dehydrogenase complex).During this NAD+ ——> NADH + H+

Question 19

What’s Kreb’s cycle?

Answer 19

Sequential or step wise oxidative and cyclic degradation of activated acetate is called Krebs cycle.(aka metabolic sink)

Question 20

Name complexes involved in ETS.

Answer 20

Complex 1:NADH-Dehydrogenase or Nadh-UQ Reductase
Complex 2: succinate dehydrogenase or Fadh2 dehydrogenase.
Complex 3: cytochrome reductase or cytochrome bc1
Complex 4: cytochrome oxidase or cytochrome aa3
* Complex 5: ATP synthase or fo-f1 particles.
*if ETS + ATP synthesis is considered.

Question 21

____ is the final electron/hydrogen acceptor in ETS.

Answer 21

O2.

Question 22

Name mobile carriers involved in ETS.

Answer 22

▪️Ubiquinone or Co-UQ

▪️Cyt. C

Question 23

Respiratory coefficient of tripalmitin ( a fat) is :

Answer 23

0.7

R.Q= 102 co2 / 145 o2 = 0.7 [NCERT]

Question 24

Respiratory coefficient of carbohydrates is

Answer 24

1

R.Q = 6 co2 / 6 o2 = 1

Question 25

Respiratory coefficient of fats and proteins is

Answer 25

Less than 1.
Bcz fats need more o2 for oxidation
For proteins it’s usually 0.9

Question 26

Respiratory coefficient of oxalic acid and malic acid is resp.:

1) 1, 0.9
2) 0.9, 1
3) 4, 1.33
4) 1.33, 4

Answer 26

3) oxalic acid = 4 and for malic acid = 1.33