Biology Test 349

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Biology Test 349

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Weekly Quiz Competition

Question 1
4 / -1

Assertion : One single maize root apical meristem can give rise to more than 17,500 new cells per hour.

Reason : This growth is expressed as increase in size of the cell.

A
Assertion and reason both are true and the reason is correct explanation of assertion.

B
Assertion and reason both are true but reason is not correct explanation of assertion.

C
Assertion is true but reason is wrong.

D
Assertion and reason both are wrong.

Solution

Reason : Maize root apical meristem produces 17,500 new cells in one hour and the growth is due to increase in number.
Question 2
4 / -1

Which of the following is incorrect regarding rules of binomial nomenclature?

A
Biological names are in latin language

B
Biological names should be italicized when typed

C
Biological names are consist of generic name and subspecific epithet

D
Citation with biological name provide information about the scientist who first gave the valid name.

Solution

Biological names are consist of generic name and specific epithet
Question 3
4 / -1

Assertion : Cyclic photophosphorylation is shown by both PS-I and PS-II

Reason : In cyclic phosphorylation the electron moves from PS-I to PS-II and PS-II to PS-I.

A
Assertion and reason both are true and the reason is correct explanation of assertion.

B
Assertion and reason both are true but reason is not correct explanation of assertion.

C
Assertion is true but reason is wrong.

D
Assertion and reason both are wrong.

Solution

Assertion : When the two photosystems work in a series, first PS II and then the PS I, a process called non-cyclic photo-phosphorylation occurs.

Reason : In cyclic phosphorylation the electron moves from PS I to ETS and than back to PS I.
Question 4
4 / -1

A
A - Imbricate, B - Vexillary, C - Valvate, D - Twisted

B
A - Vexillary, B - Valvate, C - Twisted, D - Imbricate

C
A - Valvate, B - Twisted, C - Imbricate, D - Vexillary

D
A - Twisted, B - Imbricate, C - Vexillary, D - Valvate

Solution
Question 5
4 / -1

Which of the following statements with respect to algae are correct.

(i) Fusion between one large, non-motile female gamete and a smaller, motile male gamete is termed as oogamous.

(ii) Fusion of two gametes dissimilar in size is termed as isogamous.

(iii) Fusion of two gametes similar in size is called anisogamous.

(iv) In chlorophyceae, the major pigments are chlorophyll a and b , and the food is stored as starch.

(v) In rhodophyceae, the major pigments are chlorophyll a and d , and the food is stored as mannitol.

A
(i) and (v)

B
(iii) and (v)

C
(i) and (ii)

D
(i) and (iv)

Solution

Isogamous fertilization is the fusion of two similar gametes while anisogamous fertilization is fusion of two morphologically dissimilar motile gametes. In rhodophyceae, the major pigments are chlorophyll ‘a’ and ‘d’ but the stored food is floridean starch.
Question 6
4 / -1

The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures is called:

A
Differentiation

B
Redifferentiation

C
Development

D
Plasticity

Solution

Plasticity - it is the ability of the plants to follow different pathways in response to the environment leading to formation of different kinds of structures.
Question 7
4 / -1

The phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as:

A
Secondary growth

B
Differentiation

C
Dedifferentiation

D
Redifferentiation

Solution

The phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called Dedifferentiation.
Question 8
4 / -1

The gaseous plant growth regulator is used in plants to :

A
speed up the malting process

B
promote root growth and roothair formation to increase the absorption surface

C
help overcome apical dominance

D
kill dicotyledonous weeds in the fields

Solution

Ethylene is a gaseous plant hormone. It induces development of adventitious roots on various types of cutting. It promotes the development of lateral roots and growth of root hairs. Cytokinin helps to overcome the apical dominance.

Auxin is used to kill dicot weeds. Gibberellin speeds up the malting process
Question 9
4 / -1

The plant hormone used to destroy weeds in a field

A
IAA

B
NAA

C
2, 4-D

D
IBA

Solution

Some synthetic auxins are used as weedicides.

2,4-D is widely used to remove broad leaved weeds or dicotyledonous weeds in cereal crops or monocotyledonous plants.

IAA and IBA are natural auxins.

NAA is a synthetic auxin.
Question 10
4 / -1

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

A
Gibberellin

B
Ethylene

C
Abscisic acid

D
Cytokinin

Solution

Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield by as much as 20 tonnes per acre.

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Biology Test 349

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Biology Test 349

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Question 1

Assertion and reason both are true and the reason is correct explanation of assertion.

Assertion and reason both are true but reason is not correct explanation of assertion.

Assertion is true but reason is wrong.

Assertion and reason both are wrong.

Solution

Question 2

Biological names are in latin language

Biological names should be italicized when typed

Biological names are consist of generic name and subspecific epithet

Citation with biological name provide information about the scientist who first gave the valid name.

Solution

Question 3

Assertion and reason both are true and the reason is correct explanation of assertion.

Assertion and reason both are true but reason is not correct explanation of assertion.

Assertion is true but reason is wrong.

Assertion and reason both are wrong.

Solution

Question 4

A - Imbricate, B - Vexillary, C - Valvate, D - Twisted

A - Vexillary, B - Valvate, C - Twisted, D - Imbricate

A - Valvate, B - Twisted, C - Imbricate, D - Vexillary

A - Twisted, B - Imbricate, C - Vexillary, D - Valvate

Solution

Question 5

(i) and (v)

(iii) and (v)

(i) and (ii)

(i) and (iv)

Solution

Question 6

Differentiation

Redifferentiation

Development

Plasticity

Solution

Question 7

Secondary growth

Differentiation

Dedifferentiation

Redifferentiation

Solution

Question 8

speed up the malting process

promote root growth and roothair formation to increase the absorption surface

help overcome apical dominance

kill dicotyledonous weeds in the fields

Solution

Question 9

IAA

NAA

2, 4-D

IBA

Solution

Question 10

Gibberellin

Ethylene

Abscisic acid

Cytokinin

Solution

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