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Biology (Mixed Test)

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What is the ecological behaviour in which the animals inhabit the trees called?

  1. Arboreal

  2. Terrestrial

  3. Cosmopolitan

  4. Crepuscular


Correct Option: A
Explanation:

It is the ecological behaviour in which the animals inhabit the trees.

Which of the following types of root modifications is present in Beta vulgaris?

  1. Napiform

  2. Fusiform

  3. Conical

  4. Tuberous


Correct Option: A
Explanation:

This is the type of modification is found in turnip.

To which of the following categories does the protein rich spirulina belong?

  1. Chlorophycae

  2. Mycoplasma

  3. Blue-green algae

  4. Bacteria


Correct Option: C
Explanation:

Spirulina is the member of the cyanobacteria which are prokaryotic.

Which of the following antibacterial drugs is produced from algae?

  1. Penicillin

  2. Chlorellin

  3. Aspergillin

  4. Streptomycin


Correct Option: B
Explanation:

Chlorellin is an antibacterial drug obtained from chlorella.

Which of the following is the correct ascending order of a hierarchy of biological organisation?

  1. Kingdom, species, genus and series

  2. Order, family, genus and species

  3. Species, genus, family and cohort

  4. Division, kingdom, family and series


Correct Option: C
Explanation:

This is the correct order amongst which the species is the smallest and cohort is the largest taxon.

Which of the following is the characteristic stipule of genus Ficus?

  1. Protective stipule

  2. Tendrilar stipule

  3. Ochreate stipule

  4. Interpetiolar stipule


Correct Option: A
Explanation:

In this type, the stipule is large enough to protect the leaves.

Why is spirogyra called the silk of the pond?

  1. It forms a silky mat in water where it is present.

  2. It is grass which is green in colour.

  3. It forms oxygen bubbles during photosynthesis.

  4. It has a mucilagenous layer over it.


Correct Option: D
Explanation:

The cells are covered by a sheath of mucilage, due to which it looks like silk.

What type of interaction does the epiphytes show?

  1. Commensalism

  2. Symbiosis

  3. Amensalism

  4. Parasitism


Correct Option: A
Explanation:

It is a kind of interaction in which one organism is benefited and other is unaffected.  a plant that grows on another plant, especially one that is not parasitic, such as the numerous ferns, bromeliads, air plants, and orchids growing on tree trunks in tropical rainforests.

Which of the following parts of a cell is concerned with aerobic respiration?

  1. Cytoplasm

  2. Mitochondria

  3. Plastids

  4. Lysosomes


Correct Option: B
Explanation:

Kreb's cycle is the main part of aerobic respiration that requires oxygen, and it occurs in the mitochondria.

A splash of rain plays an important role in effecting the fertilization in

  1. fern

  2. riccia

  3. funaria

  4. cycas


Correct Option: C
Explanation:

It is a bryophyte, that depends on water for its fertilization and is called the amphibians of the plant kingdom.

In which of the following plants is a ciliate type margin present?

  1. Zizyphus

  2. Bryophyllum

  3. Water lily

  4. Mentha


Correct Option: A
Explanation:

Margin bears a fringe of fine hair.

Which of the following test-cross ratios indicates linkage?

  1. 1 : 1

  2. 1 : 2 : 1

  3. 9 : 3 : 3 : 1

  4. 7 : 1 : 1 : 7


Correct Option: D
Explanation:

In this ratio, the parental type is more than the recombinant type.

In a monohybrid cross, red is dominant over white (RRrr), what will be the phenotypic ratio in a cross of RR X Rr?

  1. 50% red

  2. 100% red

  3. 100% white

  4. 75% red


Correct Option: B
Explanation:

Only two types of progenies will be obtained, RR and Rr, and red (R) allele is present in both the situations; it will mask the effect of white.

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 'Entropy' signify with reference to the living systems?

  1. Gain of energy

  2. Loss of energy

  3. Transfer of energy

  4. Transformation of energy


Correct Option: B
Explanation:

Loss of energy leads to entropy, which leads to the stability of the system.

In which of the following phases does the mitotic spindle get organised?

  1. Prophase

  2. Metaphase

  3. Anaphase

  4. Telophase


Correct Option: B
Explanation:

Spindles get organised and the chromosomes get arranged in the equatorial plate.

Why is Fungi imperfecti called so?

  1. The sex organs develop very late in the life cycle.

  2. The sexual reproductive cycle is not known.

  3. The nutrition is of photosynthetic type.

  4. The nutrition is of saprophytic type.


Correct Option: B
Explanation:

Imperfect fungi is the least understood group of fungi overall. Fungi imperfecti is called so because the complete sexual reproductive cycle is unknown. When the fungi has just been discovered, it is automatically placed in the imperfect fungi group. When the exact sexual cycle is found, the fungi is classified in one of the threadlike, sac, club or lichen. The scientific name is Deuteromycytes.

What is the usual method of DNA replication?

  1. Conservative

  2. Dispersive

  3. Non-conservative

  4. Semi-conservative


Correct Option: D
Explanation:

In this type, one strand is parental and the other is formed new.

Which of the following valves guards the opening of aorta?

  1. Tricuspid valve

  2. Bicuspid valve

  3. Mitral valve

  4. Semilunar valve


Correct Option: D
Explanation:

It is a trilobed valve present at the opening of aorta.

The type of gene mutation in which a purine gets replaced by a pyrimidine and vice-versa is called

  1. transduction

  2. translation

  3. inversion

  4. transversion


Correct Option: D
Explanation:

This kind of aberration arises when a purine gets replaced by a pyrimidine or a pyrimidine gets replaced by a purine.

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