Tag: evs

Questions Related to evs

The major role in the dehiscence of a fern sporangium is
played by its

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. Annulus

  2. Indusium

  3. Tapetum

  4. Sorus

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Correct Option: A
Explanation:

Annulus in the major part of median vertical ring. It extends  from top to the base of the capsule.

The species of Tilletia responsible for hill bunt or stinking smut of wheat are __________________.

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. Tilletia caries and T. Foetida

  2. Tilletia caries and T. Barclayana

  3. Tilletia contraversa and T. Caries

  4. None of these

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Correct Option: A

A minimum number of meiotic divisions required to produce $50$ seeds of an angiosperm is?

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. $13$

  2. $26$

  3. $50$

  4. $63$

Show answer
Correct Option: A

'Tropane' is obtained from ____________.

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. Daucus carota

  2. Catharanthus roseus

  3. Datura Stramoneum

  4. Mentha piperata

Show answer
Correct Option: A

Put a tick mark against the correct alternative in the following statements :
Peas, gram, etc. are grown as rotation crops because

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. they are cheap

  2. they maintain soil fertility by converting soil nitrogen into nitrates

  3. provide pulses

  4. they do not require irrigation.

Show answer
Correct Option: A

Which one of the following is not a category?

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. Phylum

  2. Species

  3. Class

  4. Glumaceae

Show answer
Correct Option: D
Explanation:

Phylum, Species, and Class are taxonomic category. But, Glumaceae is not a category. It is a botanical name assigned to order including the family of grass, used by Bentham and Hooker. So, the correct answer is (D).

Which of the following is the correct sequence of events happening during germination of a seed
1. The hypocotyl of the germinating seed elongates and pushes the cotyledon above ground
2. Seed absorbs water by wicking moisture through the seed coat into the seed
3.The exterior of the seed cracks open
4. The radicle emerges from the seed and forms into the root

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. 1-3-4-2

  2. 1-2-4-3

  3. 2-3-4-1

  4. 2-3-1-4

Show answer
Correct Option: C
Explanation:
  • Initially, the seed absorbs water by wicking moisture through the seed coat into the seed itself. 
  • Moisture essentially brings the seed back to life. 
  • Once enough moisture has been absorbed by the seed, the exterior of the seed cracks open. 
  • At this point, the radicle emerges from the seed and forms into the root.
  • The hypocotyl, or stem of the germinating seed, elongates and pushes the the cotyledon above ground.
  • So the correct answer is' 2-3-4-1'

Which one of the following events takes place after in angiosperms are _______________.

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. The pollen grain germinates on the stigma

  2. The pollen tubes enter the embryo sac

  3. Two male gametes are discharged into the embryo sac

  4. The PEN(Primary Endosperm Nucleus) develops into endosperm

Show answer
Correct Option: D
Explanation:

Options (a), (b) and (c) represent the events that take place before fertilisation. Primary endosperm nucleus (PEN) is formed after double fertilisation and develops into endosperm.

Which of the following remained unchanged for last many million years?

evs developmental journey of seed seed to plants germination of seeds life within the seed

  1. Pinus

  2. Rice

  3. Acacia

  4. Ginkgo

Show answer
Correct Option: D
Explanation:

Ginkgo biloba, or maidenhair tree, has been described as a living fossil, because it is the sole survivor of an ancient group of trees older than the dinosaurs. 

The Ginkgo is an oddity in nature because it is a single species with no known living relatives; a living fossil that has been essentially unchanged for more than 200 million years. 
Ginkgo biloba has been used in Chinese traditional medicine for centuries. The leaves are used in herbal remedies for cognitive complaints, such as alzheimers disease, dementia and vertigo. The phytochemistry and bioactivity of it, have been the subject of extensive research.

The pipes which carry the waste waters from the houses is known as

evs sources of water water as nutrient basics of water pollution nutrients and deficiency

  1. Waste lines

  2. Drainage lines

  3. Water lines

  4. Wastewater lines

Show answer
Correct Option: B
Explanation:

Drainage lines are artificial passageway used to carry the waste water from the houses. It then carries the waste water to the municipal sewage system where it is treated before discharging in water body. Water lines are artificial passageway used to carry the water to the houses.  

Thus, the correct answer is option B.