Tag: evs

Questions Related to evs

Dispersal of seed in Opium or Poppy/Argemone occurs by

evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods

  1. Explosive mechanism

  2. Parachute mechanism

  3. Censer mechanism

  4. jaculator mechanism

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Correct Option: C
Explanation:

Dispersal of seeds in poppy occurs by censer mechanism. In this mechanism, the seeds are scattered after dehiscence of fruit occur when it is shaken by the wind. 

The seeds of poppy are dispersed by

evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods

  1. Wind

  2. Animals

  3. Water

  4. Explosion mechanism

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Correct Option: A
Explanation:

In pollination, pollinators play a major role and different plants adopt different methods to pollinate themselves.

  1. By wind also called anemophily and is used by around 19% of plants. Ex poppy and palm.
  2. By animals also called zoophily in which various animals mainly insects help in pollination and get a reward for this. Majority of plant use this method around 80%.ex Sunflower (by bees), potato (by bumblebees).
  3. By water also called as hydrophily and is not used as much only 0.4 % of plant favored it. Ex Vallisneria.
  4. Explosion mechanism occurs when the triggering agent come in contact and is a violent explosion in which either only anther or both anther and stigma burst to release pollen. Ex Lamiaceae family.
So the correct option is "Wind".

Which of the following is a seed borne disease

evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods

  1. Bacterial blight of rice

  2. Kharia of paddy

  3. Whiptail of Brassica

  4. All of these

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Correct Option: A
Explanation:

Bacterial blight of rice is a seed borne disease which is transmitted to paddy. Seedlings when raised under high humid conditions. This disease is caused by Xanthomonas oryzae.

Which one is endospermic seed?

evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods

  1. Pea

  2. Bean

  3. Gram

  4. Castor

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Correct Option: D

Which of the following is correct chronological order of the division taking place through an apical or embryo cell to a sixteen cell stage?

evs the journey of seeds vegetative propagation and seed dispersal seed dispersal seed dispersal and its methods

  1. Vertical division $\rightarrow$ Transverse division $\rightarrow$ Division at right angles to both the previous divisions $\rightarrow$ periclinal division

  2. Vertical division $\rightarrow$ Vertical division at right angles to the first division $\rightarrow$ Division at right angles to both the previous divisions $\rightarrow$ Periclinal divisions

  3. Vertical division $\rightarrow$ Transverse division $\rightarrow$ Periclinal division

  4. Vertical division $\rightarrow$ Vertical division at right angles to the first divisions $\rightarrow$ Transverse division $\rightarrow$ Periclinal division

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Correct Option: D

How is water conserved when evaporation is reduced?

evs receding water table water resources and conservation water conservation and irrigation water a precious resource

  1. Low temperature

  2. Low wind speed

  3. Both (A) and (B)

  4. High temperature

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Correct Option: C

Which one is not a beneficial effect of water conservation?

evs receding water table water resources and conservation water conservation and irrigation water a precious resource

  1. Reduction in water loss

  2. Reduction in water fall

  3. Reduction in waste of resources

  4. All of the above

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Correct Option: B

Among these which of the following is a man made disaster?

evs when there is a disaster disaster and its types disaster and types disasters

  1. Radioactive radiations

  2. Mutations

  3. Industrial accidents

  4. All of the above

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Correct Option: C

Manmade disasters are mainly caused by

evs when there is a disaster disaster and its types disaster and types disasters

  1. Mishandling of chemicals in industries

  2. Biowars

  3. Flood

  4. Both A and C

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Correct Option: D

Tornado is a 

evs when there is a disaster disaster and its types disaster and types disasters

  1. Natural disaster

  2. Man-made disaster

  3. Both A and B

  4. None of the above

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Correct Option: A