Biology Test 136

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Biology Test 136

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Question 1
4 / -1

In mung bean, resistance to yellow mosaic virus and powdery mildew was induced by

A
Heterozygosity

B
Pure line

C
Mutation

D
Homozygosity

Solution

Breeding techniques helped in the development of new resistant varieties of the plants. The mutation techniques help in the production of the mung bean varieties which are resistant to the yellow vein mosaic virus and the powdery mildew. The generation of these varieties helped in increasing the yield.

Hence, the correct option is (C).
Question 2
4 / -1

Guttation is mainly due to

A
Root pressure

B
Osmosis

C
Transpiration

D
Imbibition

Solution

Guttation is mainly due to the 'Root pressure'. As various mineral ions from the soil are actively transported into the vascular tissue of the roots, water follows and increases the pressure inside the xylem. This positive pressure is termed root pressure.

Hence, the correct option is (A).
Question 3
4 / -1

The wings of a bird and the wings of insects are

A
Analogous structures

B
Homologous structures

C
Phylogenetic structures

D
None of the above

Solution

Analogous structures are structures that are similar in unrelated organisms. The structures are similar because they evolved to do the same job, not because they were inherited from a common ancestor. For example, the wings of insects and birds, look similar on the outside.

Hence, the correct option is (A).
Question 4
4 / -1

The function of which of the following is to act like a one-way valve?

A
Synapse

B
Dendrite

C
Myelin

D
None of these

Solution

Synapse acts as a one way valve because the chemical substances is present on only one side of the gap. Due to this, the message from one nerve to another moves only through one side. This way synapse ensures that nerve impulses travel only in one direction.

Hence, the correct option is (A).
Question 5
4 / -1

When the union of stamens takes place among themselves, it is called as cohesion. The cohesion observed in well known ornamental flower Hibiscus is ________________.

A
Diadelphous

B
Monadelphous

C
Polyadelphous

D
Syngenesious

Solution

When all the petals are free it is called polypetalous. In twisted aestivation, one part of a petal covers adjacent petals and the other part is covered by posterior petal. One margin of the petal overlaps that of the next one and the other margin is overlapped by the third one. e.g., Cotton, Ladyfinger, China rose. In monadelphous, all the filaments are united into a single bundle but anthers are free from each other. In this type of cohesion, a tube is formed around the gynoecium which is called a staminal tube e.g., Cotton, Hollyhock, Ladyfinger. Hibiscus has all of the above characteristics.

Hence, the correct option is (B).
Question 6
4 / -1

Which of the following are an example of lipid-anchored proteins?

A
Hormones

B
G-proteins

C
Pump proteins

D
None of these

Solution

In lipid anchored proteins, a covalently attached fatty acid such as palmitate or myristate serves to anchor them to either face of the cell membrane. Examples include G proteins and certain kinases.

Hence, the correct option is (B).
Question 7
4 / -1

Which of the following statements is/are false?

(a) The respiratory quotient depends upon the type of respiratory substrate used during respiration.

(b) In oxidative phosphorylation, O₂ is the ultimate acceptor of electrons and it gets reduced to water.

(c) The ratio of the volume of CO₂ consumed to the volume of O₂ evolved in respiration is called respiratory quotient.

A
Only (a)

B
Only (a) and (b)

C
Only (b)

D
Only (c)

Solution

A respiratory quotient is a dimensionless number used in calculations of basal metabolic rate when estimated from carbon dioxide production. It is calculated from the ratio of carbon dioxide produced by the body to oxygen consumed by the body.

In the body, oxygen is used by cells of the body's tissues and carbon dioxide is produced as a waste product.

Hence, the correct option is (D).
Question 8
4 / -1

Which of the following features is common among urochordata, cephalochordata and vertebrata?

A
Notochord is present only in the larval tail

B
Notochord extends from head to tail

C
All have notochord only during the embryonic period

D
Notochord is present in all

Solution

Members of these groups also possess the four distinctive features of chordates at some point during their development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. Unlike vertebrates, urochordates and cephalochordates never develop a bony backbone.

Hence, the correct option is (D).
Question 9
4 / -1

______ is the branch of genetics, which deals with heritable changes in gene activity that are not caused by changes in the DNA sequence.

A
Molecular genetics

B
Metagenics

C
Archaeogenetics

D
Epigenetics

Solution

Epigenetics is the study of how your behaviors and environment can cause changes that affect the way your genes work. Unlike genetic changes, epigenetic changes are reversible and do not change your DNA sequence, but they can change how your body reads a DNA sequence.

Hence, the correct option is (D).
Question 10
4 / -1

How do rhizoids differ from roots?

A
Rhizoids are unicellular, but roots are multicellular.

B
Rhizoids arise in gametophytes, but roots arise in sporophytes.

C
Roots have vascular supply, but rhizoids are without vascular supply.

D
All of the above

Solution

A rhizoid (such as is found on the gametophytes of bryophytes or ferns) is basically just a filament that anchors the plant to the ground. A root, on the other hand, is a sophisticated structure containing many differentlayers including vascular tissue, playing a key role in water and nutrient uptake.

Hence, the correct option is (D).

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Biology Test 136

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Biology Test 136

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SHARING IS CARING

Question 1

Heterozygosity

Pure line

Mutation

Homozygosity

Solution

Question 2

Root pressure

Osmosis

Transpiration

Imbibition

Solution

Question 3

Analogous structures

Homologous structures

Phylogenetic structures

None of the above

Solution

Question 4

Synapse

Dendrite

Myelin

None of these

Solution

Question 5

Diadelphous

Monadelphous

Polyadelphous

Syngenesious

Solution

Question 6

Hormones

G-proteins

Pump proteins

None of these

Solution

Question 7

Only (a)

Only (a) and (b)

Only (b)

Only (c)

Solution

Question 8

Notochord is present only in the larval tail

Notochord extends from head to tail

All have notochord only during the embryonic period

Notochord is present in all

Solution

Question 9

Molecular genetics

Metagenics

Archaeogenetics

Epigenetics

Solution

Question 10

Rhizoids are unicellular, but roots are multicellular.

Rhizoids arise in gametophytes, but roots arise in sporophytes.

Roots have vascular supply, but rhizoids are without vascular supply.

All of the above

Solution

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