Tag: biological diversity

Questions Related to biological diversity

Cotyledon is also known as

biology biological diversity species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Seed leaves

  2. Endosperm

  3. Embryo

  4. None of the above

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Correct Option: A
Explanation:
The cotyledons are referred to as seed leaves. It is because they act as the leaves of the seed during the process of germination. This in the sense that, as the leaves of plants provide food for the plants, so does the cotyledons provide food for the germinating plant. This is possible because the cotyledons store food necessary used during this process. So, the correct option is 'Seed leaves'.

Which character of pteridophytes is not similar to bryophytes?

biology biological diversity species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Water requirement for fertilization

  2. Dependence of sporophyte on gametophyte

  3. Heterospory

  4. None of these

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Correct Option: A
Explanation:

  • Bryophytes are known as the amphibians of plant kingdom because they need water for fertilisation. The sperms of bryophytes are flagellated and reach the eggs by means of swimming in water. On the other hand, pteridophytes do not need water for fertilisation.
  • Bryophytes have gametophyte as dominant phase of life on which sporophyte is dependent whereas Pteridophytes have sporophyte as dominant phase but sporophyte is not dependent on gametophyte.
  • Heterospory is the formation of two types of spores which are different in size i.e. large spores and small spores. Large spores are called megaspores while small spores are called microspores. Spores are formed by the sporophyte both in bryophytes and pteridophytes.
Hence, option A is defines a character which is not same in bryophytes and pteridophytes.
So, the correct answer is 'Water requirement for fertilization'.

Midrib is present in leaves of

biology biological diversity species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Monocots

  2. Bryophytes

  3. Pteridophytes

  4. None of these

Show answer
Correct Option: D
Explanation:
option (d) is correct.
Explanation- It is in this layer that photosynthesis occurs. it contains a prominent midrib at the centre of the leaf blade which is the main vein. From this midrib arise branches called veins. they are of different types depending upon the type of edges, the pattern of the veins and the number of blades per leaf.