Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

In aerobic respiration, the ultimate or final electron acceptor is:

  1. Atomic oxygen

  2. Molecular oxygen
  3. Cytochrome $a _3$

  4. Water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In cellular respiration: NADH and FADH2 are converted to ATP through an electron transport chain with oxygen as the 'terminal electron acceptor'. Oxygen is the final electron acceptor. This is the only reason oxygen is required for living systems.

So, the correct option is 'Atomic oxygen'.

Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

Which of the following processes is not related to the pathway of respiration which occurs in both aerobic and anaerobic respiration?

  1. Dehydrogenation of triose phosphate

  2. Substrate level phosphorylation
  3. Reduction of coenzyme $NAD^+$

  4. Release of Carbon dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Substrate level phosphorylation provides quicker, less efficient, source of ATP, independent of external electron acceptors.This is only present in human erythrocytes which have no mitochondria and in oxygen depleted muscle. 

Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

Which one is product of aerobic respiration?

  1. Malic acid

  2. Ethyl alcohol

  3. Lactic acid

  4. Pyruvic acid.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glucose breakdown into pyruvic acid in the absence of oxygen and in the absence of oxygen pyruvic acid is converted into lactic acid even yeast in converted to ethyl alcohol in no-oxygen.

So the correct option is 'Malic acid'.

Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

Which can readily respire without oxygen?

  1. Anabaena

  2. Saccharomyces

  3. Mushroom

  4. Fish
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yeast possesses good fermentation potential in the absence of oxygen. Saccharomyces grow anaerobically (without oxygen) same as it grows in aerobically (with oxygen).

So the correct option is 'Saccharomyces'.

Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

Mark the correct statement.

  1. Anaerobes grow in absence of oxygen.

  2. Aerophiles can grow in complete absence of oxygen.

  3. Aerobes can grow in absence of oxygen.

  4. Obligate anaerobes can live in the presence of abundant oxygen.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The first statement is the correct one which say the organism grow with no oxygen is called as anaerobes.

So the correct option is 'Anaerobes grow in absence of oxygen'.

Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

Which one yields the maximum energy?

  1. Krebs cycle

  2. Anaerobic respiration

  3. Glycolysis

  4. Aerobic respiration.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Maximum number of ATP is generated per glucose molecule oxidation by aerobic respiration.

Glycolysis gives 2 ATP by  substrate-level phosphorylation and 2 NADH yields 6 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation, Transition Reaction gives 2 NADH yields 6 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation, citric acid cycle gives 2 ATP from substrate-level phosphorylation, 6 NADH yields 18 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation, 2 FADH$ _2$ yields 4 ATP (assuming 2 ATP per FADH$ _2$) by oxidative phosphorylation. So the total maximum yield of ATP generated from one glucose molecule is 38 ATP: 4 from substrate-level phosphorylation; 34 from oxidative phosphorylation.
So the correct option is 'Aerobic respiration'.

Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

Aerobic respiration occurs in 

  1. Mitochondria

  2. Peroxisomes

  3. Cytoplasm

  4. Cytoplasm and mitochondria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aerobic respiration occurs in the presence of oxygen. Glycolysis, Krebs' cycle and ETS are all stepwise processes of aerobic respiration. While glycolysis occurs in the cytoplasm, Krebs' cycle and ETS both take place in the mitochondria of the cell. 

So the answer is 'Cytoplasm and mitochondria'.

Multiple choice zoology respiratory system do plants breathe? plant respiration respiration-plants

The respiratory process of yeast is

  1. Rarely anaerobic

  2. Anaerobic

  3. Purely aerobic

  4. Both aerobic and anaerobic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A unicellular organism like yeast can carry out both aerobic as well as anaerobic respiration depending on the environmental conditions. Anaerobic respiration is usually alcoholic fermentation and the end products are ethanol and carbon dioxide. Aerobic respiration produces CO$ _2$ and H$ _2$O as end products.

So, the correct answer is 'Both aerobic and anaerobic'.

Multiple choice zoology control and coordination in living organisms adrenal gland thymus and adrenal gland adrenal glands

The secretion of aldosterone by adrenal cortex is directly controlled by

  1. Plasma $K^{+}$ concentration

  2. Plasma Ca concentration

  3. Level of blood angiotensin

  4. Both A and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aldosterone secretion is primarily regulated by the renin-angiotensin-aldosterone system (RAAS) and directly by plasma potassium (K+) concentration. An increase in plasma K+ directly stimulates the adrenal cortex to release aldosterone.