Tag: evs

Questions Related to evs

Male and female gametophytes do not have free independent existence in 

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Pteris

  2. Cedrus

  3. Polytrichum

  4. Funaria

Show answer
Correct Option: B
Explanation:

Cedrus is a gymnosperm. In gymnosperms, male and female gametophytes do not have free independent existence. They remain within the sporangia retained on the sporophytes. 

Thus, the correct answer is option B.

Choose the correct answers from the alternatives given.
In which one of the following groups would you place a plant which produces seeds but lacks fruits

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. Bryophytes

  2. Pteridophytes

  3. Gymnosperms

  4. Dicotyledonous plants

Show answer
Correct Option: C
Explanation:

The gymnosperms are the plants in which the ovules are not enclosed by an ovary wall and remain exposed, both before and after fertilization. This is that developers fertilization are not covered that is they are naked.


So, the correct option is gymnosperm.

Choose the correct answers from the alternatives given.
Gymnosperms generally lack

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. xylem vessels and companion cells in phloem

  2. xylem tracheids and sieve tubes in phloem

  3. xylem vessels and sieve tubes in phloem

  4. xylem tracheids and companion cells in phloem

Show answer
Correct Option: A
Explanation:

Gymnosperm generally lacks xylem vessels and companion cells in phloem as it grows in a cold and dry climate and they didn't evolve to have vessels and vessels are considered as advanced elements of xylem. And companion cells in phloem assist active transport of minerals which is absent in Gymnosperm.

So, the correct answer is 'xylem vessels and companion cells in phloem'.

Choose the correct answers from the alternatives given.
Fruits are not formed in gymnosperms because:

evs flowers and fruits phanerogams gymnosperms pictorial feature of plant kingdom

  1. they are seedless

  2. they are not pollinated

  3. the process of fertilization does not occur

  4. they have no ovary

Show answer
Correct Option: D
Explanation:

Gymnosperms have no ovary, they can never produce fruit.  

Seeds develop from the ovules which are found in the developed ovaries or fruit, but in the case of gymnosperms, the ovules are located directly on the surface of the flower or cone.  Yews and ginkgoes develop fruit-like structures, but their seed is not inside these organs, which makes them gymnosperms.
So the correct answer is 'They have no ovary'.

The geographic limit within which a population exists is called

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. Niche

  2. Ecosystem

  3. Habitat

  4. Biome

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Correct Option: C

Biotic components are dependent on abiotic components of environment.

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. True

  2. False

Show answer
Correct Option: A

Two species in the same habitat can coexist when they

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. differ in their use of resources

  2. share the same resource in different ways

  3. use the same resource at different times

  4. all of these

Show answer
Correct Option: D
Explanation:

2 species that are coexisting in a particular area have few characteristic features to avoid intraspecific competition.

These differ in the use of resources
These share the same resource in different ways
These use the same resource at different times
So, the correct option is 'all of these'

An example of biotic components in nature is

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. Cells

  2. Organic molecules

  3. Plants

  4. All of the above

Show answer
Correct Option: D
Explanation:
Biotic components are the living things that shape an ecosystem. Examples of biotic components include animals, plants, fungi, and bacteria. Abiotic components are non-living components that influence an ecosystem. Examples of abiotic factors are temperature, air currents, and minerals.

So, the correct answer is 'D'.

Which of the following examples show the interdependency of biotic and abiotic factors?

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. Frigid climates do not support lizards and other cold-blooded animals

  2. Relation between water and life

  3. The need of sunlight for the process of photosynthesis

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • The biotic components of the ecosystem are the producers and consumers. The abiotic or the non-living components include soil, water, light, inorganic substances.
  • Both biotic and abiotic factors are interdependent in an ecosystem, and if one factor is changed or removed, it can affect the entire ecosystem. Abiotic factors are especially important because they directly affect how organisms survive.
  • Examples showing the interdependency of biotic and abiotic factors include Frigid climates do not support lizards and other cold-blooded animals, Relation between water and life and the need for sunlight for the process of photosynthesis.
  • So, the correct answer is 'All the above'.

An ecosystem is made up of one type of community.

evs interdependence in our environment meaning of environment significance of biodiversity habitat and adaptation

  1. True

  2. False

  3. Either

  4. Neither

Show answer
Correct Option: B
Explanation:
Ecosystem is a community of different organisms that interact with each other and with their surroundings or environment. A community is a group of populations of different species present in a given area. An ecosystem is made up of different communities. It includes different populations which interact with the biotic components and abiotic components of environment.
Hence, the statement given in the question is not correct.
So, the correct answer is 'False'.