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Mixed Test (Biology)

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What is the correct sequence of ecological complexities?

  1. Biosphere, community, ecosystem, niche

  2. Community, niche, biosphere, ecosystem

  3. Niche, community, ecosystem, biosphere

  4. Ecosystem, biosphere, niche, community


Correct Option: C
Explanation:

This is the correct order.

Which of the following types of root modifications is found in radish?

  1. Fusiform

  2. Conical

  3. Napiform

  4. Tuberous


Correct Option: A
Explanation:

It has swollen middle part and tapering ends.

If a couple of medium height has three tall-statured children, then what could be the possible explanation for it?

  1. Dominant genes

  2. Cumulative genes

  3. Codominant genes

  4. Sex-linked genes

  5. None of the above


Correct Option: B
Explanation:

This trait is quantitative in nature. 

The correct sequence of the constituents of a food chain given below is

  1. field rat, grasshopper, hawk, clover

  2. grasshopper, field rat, clover, hawk

  3. hawk, grasshoper, field rat, clover

  4. clover, grasshoper, field rat, hawk


Correct Option: D
Explanation:

Clover is a producer, grasshoper is a herbivore, rat is a 10 consumer and hawk is a  20 consumer.

What does the term 'locus' refer to in genetics?

  1. The physical expression of a character

  2. The genetic expression of a character

  3. The position of an allele on a chromosome.

  4. The basic unit of character inheritance


Correct Option: C
Explanation:

It is the position of an allelic form of gene on the homologous chromosomes.

Which of the following types of stipules is present in Castor?

  1. Opposite stipule

  2. Free lateral stipule

  3. Interpetiolar stipule

  4. Ochreate stipule


Correct Option: A
Explanation:

In this type, two stipules are fused by outer margin.

Which of the following is the only artery in the body that carries deoxygenated blood?

  1. Aorta

  2. Pulmonary artery

  3. Hepatic artery

  4. Renal artery


Correct Option: B
Explanation:

It carries deoxygenated blood to lungs for oxygenation.

What is the shape of lamina of leaf in vallisneria?

  1. Linear

  2. Acicular

  3. Oblong

  4. Lanceolate


Correct Option: A
Explanation:

Lamina is long, narrow and flattened in this plant.

According to the ecological behaviour, to which category do the sun loving plants belong?

  1. Photophytes

  2. Sciophytes

  3. Heliophytes

  4. Xerophytes


Correct Option: C
Explanation:

Helio means sun and phytes means plants. So these are the sun loving plants.

What is the function of elaters?

  1. Spore dispersal

  2. Nutrition of archaegonium

  3. Spore production

  4. Nutrition of the spore


Correct Option: A
Explanation:

The elaters help in the dispersal of spores as they form wing like structure.

Which of the following is the correct representation of the scientific name of tiger according to binomial nomenclature?

  1. Oanthera Tigris

  2. Lanthera Tigris

  3. Vanthera Tigris

  4. Panthera Tigris


Correct Option: D
Explanation:

The above patteren is the correct method of writing the scientific name of tiger.

Which one of the following ratios remains constant in the DNA of different species?

  1. A+T/C+G

  2. A+G/T+C

  3. A+C/T+G

  4. A+U/C+G


Correct Option: B
Explanation:

This is the correct constant ratio for a species according to Chargaff's rule.

Which of the following is/are considered while doing classification in the Kingdom Fungi?

  1. The nature of reproductive bodies

  2. Cell wall material of hyphae

  3. Type of pigment present in mycellium

  4. All of these


Correct Option: A
Explanation:

Fungi shows an unconventional trend that the complexity of the sex organs decreases with the higher groups.

What is the shape of the bacterium Treponema pallidium that causes syphilis?

  1. Bacillus

  2. Coccus

  3. Spirochaete

  4. Vibrio


Correct Option: C
Explanation:

This bacteria is spiral in shape like all the members of spirochaete.

Which of the following is a function of amyloplast?

  1. Storage of starch

  2. Trapping of light

  3. Absorption of water

  4. Storage of fats


Correct Option: A
Explanation:

The name itself suggests that amyloplast is the body that encloses something.

The sporophyte of moss is mainly parasitic, but can have a nutritional autonomy by the help of

  1. columella

  2. apophysis

  3. trabeculae

  4. calyptra


Correct Option: B
Explanation:

It is the mouth of the capsule of the mosses which have toothed openings.

Which of the following is the basic unit of classification?

  1. Phylum

  2. Family

  3. Genus

  4. Species


Correct Option: D
Explanation:

The members of a species are reproductively isolated from other species and are basic units of classification.

Algae 'volvox' is considered a colonial form and not a multicellular organism because

  1. all the cells are arranged in a single layer

  2. the cells are invested with mucilagenous layer

  3. the cells are able to communicate with the environment

  4. all the cells are joined by plasmodesmata with a clear division of labour


Correct Option: D
Explanation:

This is the correct reason due to which volvox is called colonial.

If a segment of a chromosome is broken and attached to the same chromosome upside down with no loss or gain of genes, then the aberration will be termed as

  1. deletion

  2. duplication

  3. translocation

  4. inversion


Correct Option: D
Explanation:

It is the aberration in which a segment detaches, gets inverted and rejoins the main chromosome.

Which of the following pigments is a characteristic of red algae?

  1. Chlorophyll

  2. Phycocyanine

  3. Phycoerythrin

  4. Xanthophyll


Correct Option: C
Explanation:

Phyco means plants and erythrin means red.

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