Tag: species, communities and ecosystems

Questions Related to species, communities and ecosystems

Which of the following is called the walking fern?

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

  1. Selaginella

  2. Adiantum

  3. Equisetum

  4. Psilotum

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Correct Option: B
Explanation:
A.Selaginella - spike moss
B.Adiantum - walking fern
C.Equisetum - Horsetails
D.Psilotum - whisk fern
Walking fern is a common name for Adiantum. It belongs to Pteridophyta. It got its name as wherever arching leaves of parent plant body touches the ground, new plantlets grow giving it a walking appearance.
So, the correct option is 'Adiantum'.

Roundworms belong to the phyla

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

  1. Nematoda

  2. Porifera

  3. Platyhelminthes

  4. None of these

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Correct Option: A
Explanation:
Nematodes are roundworms, named as such because they are round in cross-section. They belong to phylum Nematoda. Nematodes possess digestive, nervous, excretory, and reproductive systems, but lack a discrete circulatory or respiratory system.
So, the correct answer is 'Nematoda'.

Approximately how many cells are present in the boy of an adult person?

biology evolution and biodiversity species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. $10^{14}$

  2. $10^{15}$

  3. $10^{18}$

  4. $10^{21}$

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Correct Option: A
Explanation:

An adult human being has approximately 100 000 billion cells, all originating from a single cell, the fertilized egg cell.

So the correct answer is option A

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'.

Which of the following is an edible fungus? 

biology biosystematics species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Mushroom

  2. Cabbage

  3. Pea

  4. Rhizobium

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Correct Option: A
Explanation:
Edible mushrooms are fleshy and have edible fruit bodies. They are found either below ground or above ground where they may be picked by hand. Edibility is due to the absence of poisonous effects on humans and desirable taste and aroma.

So, the correct answer is 'So, the correct answer is 'Mushroom'

A taxonomic group of closely related genera is known as?

biology ecology species, communities and ecosystems kingdom fungi monera, protista, fungi

  1. Species

  2. Order

  3. Family

  4. Class

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Correct Option: A
Explanation:
Species represents a distinct group of the population that really or most likely breed from close animals. This taxonomic class is segregated from other classes through the method of reproduction. It bears minimal taxonomic traits.
It includes individuals that inherit basic similarities.It can be differentiated from other closely connected species because of idiosyncratic morphological characteristics. Option A is the answer

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.

Which one of the following is not one of the three aspects studied in biogeochemical cycling?

botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

  1. The nature and size of natural reservoir

  2. The rate of movement between reservoirs

  3. Interaction between different biogeochemical cycles

  4. Creation of their own biogeochemical cycles by new species

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Correct Option: D
Explanation:
The cyclic movement of the elements from the abiotic system to the biotic system and back again is the biogeochemical cycle. These chemicals form the compounds of food, so these are also known as nutrient cycles.
Some of the important biogeochemical cycles are carbon cycle, Oxygen cycle nitrogen cycle, Phosphorus cycle.
Following aspect are studied in biogeochemical cycling-
The nature and size of the natural reservoir
The rate of movement between reservoirs
The interaction between different biogeochemical cycles
The correct option is the 'creation of their own biogeochemical cycles by new species'

The reservoir for the gaseous type of biogeochemical cycle exists in.

botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

  1. Stratosphere

  2. Atmosphere

  3. Ionosphere

  4. Lithosphere

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Correct Option: B
Explanation:

The reservoir for gaseous type of nutrient cycles, e.g., nitrogen, carbon cycle exist in the atmosphere.