R4RIN – MCQs, Mock Tests | Botany Botany MCQS[NEET-2021 to 2022]-Plant respiration

The process of respiration in green plants occurs

1. only when stomata are open
2. only when photosynthesis ceases
3. only when photosynthesis is in progress
4. At all times

✅ Correct Answer: 4

Respiratory enzymes are located in

1. mitochondrial matrix
2. cristae
3. perimitochondrial space
4. outer membrane

✅ Correct Answer: 2

The site of glycolysis in a cell is

1. nucleus
2. chloroplast
3. cytoplasm
4. mitochondria

✅ Correct Answer: 3

Respiration is

1. Anabolic process
2. Exothermic process
3. Endothermic process
4. Endergonic process

✅ Correct Answer: 1

The annual plant exchange of gases takes place mainly through

1. Leaf scars
2. lenticels
3. stomata
4. stem

✅ Correct Answer: 3

Krebs cycle take place in

1. vesicles of ER
2. Mitochondrial matrix
3. lysosomes
4. Dictyosomes

✅ Correct Answer: 2

Common immediate source of energy in cellular activity

1. NAD
2. ATP
3. DNA
4. RNA

✅ Correct Answer: 2

Photorespiration involves

1. Glycolate cycle
2. krebs cycle
3. calvin cycle
4. CAM cycle

✅ Correct Answer: 1

In succulent xerophytes the R.Q is

1. Zero
2. unity
3. less than one
4. more than one

✅ Correct Answer: 1

R.Q. of fatty substances is generally

1. unity
2. Zero
3. more than one
4. less than one

✅ Correct Answer: 4

Conversion of pyruvic acid into ethyl alcohol is facilitated by the enzymes

1. carboxylase
2. phosphatase
3. dehygrogenase
4. carboxylase and dehygrogenase

✅ Correct Answer: 4

During respiration yeast converts glucose to

1. ethanol and water
2. ethanol and oxygen
3. ethanol and CO2
4. lactic acid and CO2

✅ Correct Answer: 3

The net gain of ATP produced during the oxidation of one glucose molecule in a plant cell

1. 38 ATP molecules
2. 30 ATP molecules
3. 36 ATP molecules
4. 24 ATP molecules

✅ Correct Answer: 3

The final acceptor of electrons in the electron transport chain is

1. Water
2. Oxygen
3. Hydrogen
4. Cytochrome b

✅ Correct Answer: 2

In plant cell, digestion of fats occurs with the help of

1. lysosomes
2. Peroxisomes
3. glyoxisomes
4. microtubules

✅ Correct Answer: 3

The ultimate respiratory substrate, yielding maximum number of ATP molecules, is

1. glycogen
2. glucose
3. amylose
4. ketogenic amino acid

✅ Correct Answer: 2

End product of citric acid/ Krebs cycle is

1. citric acid
2. pyruvic acid
3. latic acid
4. carbon dioxide and water

✅ Correct Answer: 4

The first phase in the breakdown of glucose, in animal cell, is

1. glycolysis
2. E.T.S
3. Krebs cycle
4. Glycolysis

✅ Correct Answer: 4

End product of fermentation are

1. O2 and C2H5OH
2. CO2 and C2H5OH
3. CO2 and O2
4. CO2 and acetyaldehyde

✅ Correct Answer: 2

Out of 36 ATP molecules produced per glucose molecule during respiration

1. 2 are produced outside glycolysis and 34 during repiratory chain
2. 2 are produced outside mitochondria and 34 inside the mitochondria
3. all the formed inside mitochondria
4. 2 during glycolysis and 34 during Krebs cycle

✅ Correct Answer: 2

Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is known as

1. TCA pathway
2. Glycolysis
3. HMS pathway
4. Glycolysis

✅ Correct Answer: 4

When one glucose molecule is completely oxidised, it changes

1. 36 ADP molecules into 36 ATP molecules
2. 38 ADP molecules into 38 ATP molecules
3. 30 ADP molecules into 30 ATP molecules
4. 32 ADP molecules into 32 ATP molecules

✅ Correct Answer: 2

Link between glycolysis, Krebs cycle and ÃŽÂ² oxidation of fatty acid or carbohydrate and fat metabolism is

1. citric acid
2. succinic acid
3. acety CoA
4. Oxaloacetic acid

✅ Correct Answer: 3

Terminal cytochrome of respiratory chain which donates electrons to oxygen is

1. Cyt. b
2. Cyt.a1
3. Cyt.c
4. Cyt.a3

✅ Correct Answer: 4

R. Q is ratio of

1. CO2 produced to substarate consumed
2. oxygen consumed to CO2 produced
3. CO2 produced to O2 consumed
4. Oxygen consumed to water produced

✅ Correct Answer: 2

Dormancy is the

1. failure of a seed to germinate under favourable condition
2. failure of a seed to germinate under unfavourable condition
3. the ability of a seed to germinate under favourable condition
4. the ability of a seed to germinate under unfavourable condition

✅ Correct Answer: 2

Which of the following statement is true regarding dormancy?

1. Dormancy may be due to seed coats impermeability to CO2
2. Dormancy helps the seed to overcome unfavourable condition
3. Dormancy helps the seed to germinate during unfavourable condition
4. Dormancy may be due to soft fragile seed coat

✅ Correct Answer: 2

Which of the following is a natural germination inhibitor that induces dormancy?

1. auxin
2. cytokinin
3. ABA
4. gibberellin

✅ Correct Answer: 3

Some seeds enter dormancy when exposed to unfavourable condition for some time. Such dormancy is called

1. immediate dormancy
2. primary dormancy
3. secondary dormancy
4. short term dormancy

✅ Correct Answer: 3

Which of the following plant exhibit dormancy due to immature embryo

1. Xanthium
2. Orchids
3. Hibiscus
4. Solanum

✅ Correct Answer: 2

The process of weakening the seed coat to break dormancy is called

1. vernalization
2. scarification
3. photoperiodism
4. stratification

✅ Correct Answer: 2

Photoblastic seeds are seeds

1. affected by light for germination
2. not affected by light for germination
3. independent of light for germination
4. affected by light and temperature for germination

✅ Correct Answer: 1

Which is the pigment is involved in the germination of photoblastic seeds

1. chlorophyll
2. carotenes
3. phytochromes
4. phaeophytin

✅ Correct Answer: 3

Which of the following hormone is a dormancy inducer?

1. 2-4D
2. GA4
3. ABA
4. GA3

✅ Correct Answer: 3

Which of the following is the structure in the seed coat that prevents water and O2 entry into seed thereby inducing dormancy

1. strophiolar plug
2. pericarp
3. exocarp
4. epicarp

✅ Correct Answer: 1

Conversion of pyruvic acid into lactic acid depends upon

1. Presence of NAD
2. Presence of enzymes
3. Absence of oxygen
4. None

✅ Correct Answer: 3

The rate of glycolysis increases during anaerobic conditions is known as

1. Extinction point
2. Pasteur effect
3. Compensation point
4. Warburg effect

✅ Correct Answer: 2

The process of fermentation is discovered by

1. Buchner
2. Pasteur
3. Jones
4. Krebs

✅ Correct Answer: 2

Which of the following process may be toxic to plants

1. Photolysis of water
2. Aerobic respiration
3. Photosynthesis
4. Anaerobic respiration

✅ Correct Answer: 4

A brewery subjects about 1 tonne of purified jaggary to fermentation under ideal conditions. If it has produced 0.3 tonne of alcohol, what quantity of CO2 it has expelled to its atmosphere

1. 0.1 tonne
2. 0.2 tonne
3. 0.3 tonne
4. 0.4 tonne

✅ Correct Answer: 3

In anaerobic condition, The incomplete breakdown of sugars results in the formation of

1. Alcohol and CO2
2. Fructose and water
3. Alcohol and water
4. Alcohol and Fructose

✅ Correct Answer: 1

Which among the following plant is widely accepted to respire in absence of oxygen ?

1. Grass
2. Yeast
3. Potato
4. Chlorella

✅ Correct Answer: 2

Alcohol is produced during which process ?

1. Aerobic respiration
2. Anerobic respiration
3. Photosynthesis
4. None

✅ Correct Answer: 2

When a molecule of pyruvic acid is subjected to anaerobic oxidation and forms lactic acid, there is

1. Loss of 9 ATP molecules
2. Loss of 3 ATP molecules
3. Gain of 3 ATP molecules
4. Gain of 9 ATP molecules

✅ Correct Answer: 2

The end products of fermentation when sugars are used as raw material

1. Alcohol and acetic acid
2. CO2 and C2H5OH
3. Alcohol and CO2
4. None

✅ Correct Answer: 3

Fermentation is

1. Anaerobic respiration
2. Incomplete oxidation of carbohydrates
3. Complete oxidation of carbohydrates
4. None

✅ Correct Answer: 1

Conversion of pyruvic acid into ethyl alcohol is facilitated by the enzymes

1. Dehydrogenase
2. Carboxylase
3. Dehydrogenase and Carboxylase
4. Decarboxylase and dehydrogenase

✅ Correct Answer: 4

During anaerobic respiration in yeast

1. Water and CO2 are end products
2. CO2, C2H5OH and energy are end products
3. Water and C2H5OH and energy are end products
4. None

✅ Correct Answer: 2

Fermentation is represented by the equation

1. C6H12O6 + 6O2 Ã¢â€ â€™ 6CO2 + 673 kcal
2. C6H12O6 Ã¢â€ â€™ 2C2H5OH + 2CO2 + 18 kcal
3. A and B
4. None

✅ Correct Answer: 2

Anaerobic respiration takes place in the

1. Chloroplast
2. Mitochondria
3. Cytoplasm
4. Ribosome

✅ Correct Answer: 3