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Biological diversity - class-XI

Description: biological diversity
Number of Questions: 18
Created by:
Tags: biological diversity evolution and biodiversity biosystematics biology kingdom animalia systematics of living world ecology
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Vascular bundles are absent in

  1. Gymnosperms

  2. Angiosperms

  3. Pteridophytes

  4. None of the above


Correct Option: D

Scorpions are

  1. Sanguivorous

  2. Carnivorous

  3. Herbivorous

  4. Omnivorous


Correct Option: B

"Mother-of-Pearl" is

  1. A hard iridescent substance forming the inner layer of certain shells

  2. A special large sized pad found in Japan

  3. An oyster which yields the pearl

  4. A title given to Queen Victoria on becoming the Empress of India


Correct Option: A
Explanation:

Nacre, also known as the mother of pearl, is an organic-inorganic composite material produced by some molluscs as an inner shell layer; it also makes up the outer coating of pearls. It is strong, resilient, and iridescent. So, the correct option is A. ( A hard iridescent substance forming the inner layer of certain shells )

Snakes are

  1. Viviparous

  2. Oviparous

  3. Herbivores

  4. None of the above


Correct Option: B
Explanation:

Snakes lay eggs and are hence Oviparous and not Oviparous.

Snakes are carnivores as they eat other small prey like rats, birds, etc.
So the correct answer is 'Oviparous'. 

The animals that give birth to young ones are

  1. Reptiles

  2. Birds

  3. Amphibians

  4. Mammals


Correct Option: D
Explanation:

Mammals are the warm-blooded vertebrate animal that is distinguished by the possession of hair or fur, females that secrete milk for the nourishment of the young. They give birth to young ones so they are known as viviparous.
So, the correct answer is 'Mammals'.

Which one is true of male gamete of angiosperms?

  1. Large nucleus

  2. Thick sheath of cytoplasm

  3. Thin sheath of cytoplasm devoid of ce organelles

  4. Both B and C


Correct Option: A
Explanation:

Pollen grains form the first cell of male gametophytic generation.It divides into two unequal cells; a small generative cell and a larger vegetative cell. During the germination of pollen tube over the carpel, the vegetative tube nucleus migrates into the pollen tube and reaches up to the distal end. The generative cell also migrates into the pollen tube and divides to form two male gametes. Each male gamete consists of a large nucleus surrounded by a thin sheath of cytoplasm. 

Thus, the correct answer is option A. 

Which of the following is correct in case of  homosporous pteridophytes?

  1. All the sporangia are similar

  2. Male and female gametophytes exist

  3. Two different types of spores are present

  4. None of the above


Correct Option: A
Explanation:

Homosporous pteridophytes produce only one type of spores. Also, all the sporangia in a homosporous pteridophyte are similar.

So, the correct option is 'All the sporangia are similar'.

The zygote of angiosperms is

  1. Haploid

  2. Diploid

  3. Triploid

  4. Polyploid


Correct Option: B
Explanation:
  • In angiosperms, as the pollen tube penetrates the ovule, it releases two sperm cells. One fuses with the egg to create a diploid zygote which develops into an embryo, while the other joins with the fusion nucleus to form a triploid nucleus that develops into endosperm.
  • So the correct answer is ' Diploid'.

Which of the following external characters help in differentiating a male cockroach from a female one? 

  1. Abdominal segments

  2. Anal cerci

  3. Anal styles

  4. Antennae


Correct Option: C
Explanation:

Anal style are a pair of thread like appendages arising from the 9th segment of the male cockroaches. They are characteristic feature of male cockroaches and help in copulation.

So, the correct option is 'Anal Styles'.

The blood of cockroach contains no heamoglobin. It means that

  1. Oxygen goes directly into tissues by diffusion

  2. Respiration is anaerobic

  3. Cockroach does not respire

  4. Oxygen goes, directly into intracellular capillary system


Correct Option: A
Explanation:

Cockroach blood is not red because they do not use hemoglobin to carry oxygen. In fact, their bloodstream is not used to carry oxygen either. They use a system of pipes called tracheae to bring the oxygen and remove carbon dioxide from their tissues and oxygen goes directly into tissues by diffusion. So, the correct option is A. ( Oxygen goes directly into tissues by diffusion )

Which of the following is called the walking fern?

  1. Selaginella

  2. Adiantum

  3. Equisetum

  4. Psilotum


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

  1. Nematoda

  2. Porifera

  3. Platyhelminthes

  4. None of these


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?

  1. $10^{14}$

  2. $10^{15}$

  3. $10^{18}$

  4. $10^{21}$


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

  1. Seed leaves

  2. Endosperm

  3. Embryo

  4. None of the above


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?

  1. Water requirement for fertilization

  2. Dependence of sporophyte on gametophyte

  3. Heterospory

  4. None of these


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? 

  1. Mushroom

  2. Cabbage

  3. Pea

  4. Rhizobium


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?

  1. Species

  2. Order

  3. Family

  4. Class


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

  1. Monocots

  2. Bryophytes

  3. Pteridophytes

  4. None of these


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.
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