Tag: evs

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Questions Related to evs

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Root cap is absent in 

  1. Mesophytes

  2. Hydrophyte

  3. Epiphytes

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

Root cap is present at the tip of the root and it contains meristematic cells which divide and increase the length of the root.
Mesophytes are terrestrial plants. Therefore, root cap is essential in mesophytic plants.
Epiphytes are plant which grows upon another plant or any object. They require physical support for the growth. Such plants also possess roots which anchor the plant to another plant or object.
Xerophytes are terrestrial plants which have adapted to survive in an environment with little water. Hence, roots are necessary for xerophytes. 
Hydrophytes grow in water. Hydrophytes have plenty of water hence, the root system takes secondary importance. Therefore, root cap is absent in hydrophytes. 
Therefore, the correct answer is 'Hydrophyte'.

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

A continuous system of air passages from aerial leaves to anchored roots is found in

  1. Submerged hydrophytes

  2. Floating hydrophytes

  3. Emergent hydrophytes

  4. Suspended hydrophytes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A continuous system of air passages from leaves to roots is found in emergent hydrophytes because these are the type of plants that keep themselves up from the top of water and these air passages provide buoyancy to it. submerged plants are sinked in water, floating plants are there on the surface of water. suspended hydrophyte are the plants that are just below the surface of water. So the correct answer is ' Emergent hydrophytes '. 

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Petioles are inflated in floating hydrophytes 

  1. Wolffia

  2. Eichhornia

  3. Salvinia

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

The petiole is the stalk that attaches the leaf blade to the stem. Water hyacinth leaves in natural populations vary from being long and thin‐petioled to being short with inflated petioles. water hyacinth is a floating hydrophyte that has an inflated petiole which helps in keeping it on top of the water level thus allowing it not to sink. So the correct answer is ' Eichhornia or water hyacinth. '

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

A rooted floating leaved hydrophyte is

  1. Nymphaea

  2. Hydrilla

  3. Ceratophyllum

  4. Eichhornia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Rooted Hydrophytes with Floating Leaves:
The roots of these type of hydrophytes are fixed in mud, but leaves have long
petioles which keep them floating on the water surface. Except leaves, the restof the plant body remains in water. Some examples are Nelumbo nucifera,
Nymphaea stellate (water lily), Trapa, Marsilea. 
So the correct answer is 'Nymphaea'. 
Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation

Which of the following is incorrect?

  1. Herbarium houses dried, pressed and preserved plant specimens.

  2. John Ray developed key for the identification of animals.

  3. The category division is used instead of phylum in case of plants which comprises of fewer similar features.

  4. The set of methods used in classification based on evolutionary relationship is called phenetics.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The statement- the set of methods used in classification based on evolutionary relationship is called phenetics is wrong.

Phenetics is an attempt to classify organisms based an overall similarity usually in morphology or other observable traits regardless of their phylogeny of evolutionary relation.

Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements
Select the wrong statement

  1. Oxidative decarboxylation of pyruvic acid requires the presence of enzyme pyruvate dehydrogenase.

  2. All living cells whether aerobic or anaerobic, perform glycolysis.

  3. Cyanide does not stop chemiosmosis.
  4. Respiratory chain uses ${O} _{2}$ as final hydrogen acceptor.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cyanide is an inhibitor of complex IV (in ETS) and other heme-containing enzymes of mitochondria. Thus, cyanide blocks ATP production in the cells.

Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

All of the following statements are true except

  1. Contraction of diaphragm increases volume of thoracic cavity in cephalocaudal axis

  2. During normal breathing, intrapleural pressure is always subatmospheric

  3. High surfave tention of alveolar surfactant facilities inhalation

  4. Passive exhalation results from elastic recoil of chest wall and lungs
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Which of the following is true for all mammals without any exception?

  1. Presence of diaphragm

  2. Presence of pinna
  3. Presence of $7$ cervical vertebrae

  4. Testis in extra abdominal scrotal sac
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The diaphragm is a characteristic feature of all mammals, used for respiration. Other options like pinna, 7 cervical vertebrae, or scrotal sacs have exceptions among mammals.

Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Given are the data on breathing rate, heart rate and body temperature of four different mammals A, B, C and D.

Animals Breathing Rate per min Heart Rate per min Body temperature $(^oC)$
A $160$ $500$ $36.5$
B $15$ $40$ $37.2$
C $28$ $190$ $38.2$
D $8$ $28$ $35.9$

Study the data and rank theses animals in descending order of surface area per unit volume?

  1. A $>$ B $>$ C $>$ D
  2. D $>$ B $>$ A $>$ C
  3. A $>$ C $>$ B $>$ D
  4. B $>$ D $>$ C $>$ A
Reveal answer Fill a bubble to check yourself
A Correct answer