Biology Test 279

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Biology Test 279

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Weekly Quiz Competition

Question 1
4 / -1

Family Fabaceae differs from Solanaceae and Liliaceae. With respect to the stamens, pick out the characteristics specific to family Fabaceae but not found in Solanaceae or Liliaceae.

A
Polyadelphous and epipetalous stamens

B
Monoadelphous and Monothecous anthers

C
Epiphyllous and Dithecous anthers

D
Diadelphous and Dithecous anthers

Solution

Fabaceae → Diadelphous and dithecous anther.

Solanaceae → Polyandrous, epipetalous and dithecous anther.

Liliaceae → Polyandrous, epiphyllous and dithecous anther.
Question 2
4 / -1

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.

Reason R : Internode of the shoot gets condensed to produce different floral appendages laterally at successive node instead of leaves.

In the light of the above statements, choose the correct answer from the options given below :

A
Both A and R are true but R is NOT the correct explanation of A

B
A is true but R is false

C
A is false but R is true

D
Both A and R are true and R is the correct explanation of A

Solution

The correct answer is :

Option D : Both A and R are true and R is the correct explanation of A

Statement A is true. A flower is indeed a modified shoot wherein the shoot apical meristem changes to a floral meristem.

Statement R is also true. In the process of flower formation, the internodes of the shoot get condensed, and instead of leaves, different floral appendages (such as sepals, petals, stamens, and carpels) are produced laterally at successive nodes.

Moreover, Statement R is indeed the correct explanation for Statement A. The transition from the shoot apical meristem to the floral meristem involves the condensation of internodes and the lateral production of floral appendages at nodes, which leads to the formation of a flower.
Question 3
4 / -1

Which of the following statement is not correct?

A
The rhizome is thick, prostrate and branched

B
Rhizome is a condensed form of stem

C
The apical bud in rhizome always remains above the ground

D
The rhizome is aerial with no distinct nodes and internodes

Solution

Rhizome is an underground (sub-aerial) stem. It bears distinct nodes and internodes.
Question 4
4 / -1

The type of tissue commonly found in the fruit wall of nuts is :

A
Sclereid

B
Parenchyma

C
Collenchyma

D
Sclerenchyma

Solution

The sclereids are the spherical, oval or cylindrical, highly thickened dead cells with very narrow cavities (lumen). These are found commonly in the fruit wall of nuts.
Question 5
4 / -1

Choose the correct answer from the options given below

A
(a) - (i), (b) - (iii), (c) - (iv), (d) - (ii)

B
(a) - (ii), (b) - (i), (c) - (iii), (d) - (iv)

C
(a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)

D
(a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)

Solution

Imbricate aestivation is found in Cassia

Valvate aestivation is found in Calotropis

Vexillary aestivation is found in Bean

Twisted aestivation is found in cotton
Question 6
4 / -1

Which of the following is NOT a method by which CO₂ is transported in the blood?

A
Attached to oxygen molecules

B
Bound to hemoglobin as carbaminohaemoglobin

C
As bicarbonate ions in plasma

D
Dissolved in plasma

Solution

Solution: Carbon dioxide is transported in the blood in three main ways: dissolved in plasma, as bicarbonate ions in plasma, and bound to hemoglobin as carbaminohaemoglobin. It does not attach to oxygen molecules for transport. This highlights the body's efficient mechanisms for transporting gases where they need to go.
Question 7
4 / -1

Which one of the following is the correct statement for respiration in humans?

A
Cigarette smoking may lead to inflammation of bronchi.

B
Neural signals from pneumotaxic center in pons region of brain can increase the duration of inspiration.

C
About 90% of carbon dioxide is carried by haemoglobin as carbaminohaemoglobin.

D
Workers in grinding and stone-breaking industries may suffer from lung fibrosis.

Solution

Grinding or stone breaking industries produce so mud dust that long exposure to this can give rise to inflammatior of lungs leading to fibrosis (proliferation of fibrous tissues' and thus causing serious lung damage. Inflammation ol the bronchi may also be caused by cigarette smoking. The primary function of pneumotaxic center is to limit inspiration which increase breathing rate.
Question 8
4 / -1

Given below are few respiratory disorders. Identify occupoational respiratory disorders among these.

(i) Coryza
(ii) SARS
(iii) Silicosis
(iv) Asbestosis
(v) Emphysema

A
(i) and (ii)

B
(i) and (v)

C
(iii) and (iv)

D
(i), (ii) and (v)

Solution

Silicosis and asbestosis are known as occupational disorder as they occur due to one's occuption. Workers working in industries where silica and asbestos are used can suffer from these respiratory disorders.
Question 9
4 / -1

Directions For Questions

Read the following four statements carefully.

(i) Asthma is a difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles.

(ii) The part of the respiratory system starting with the external nostrils up to the terminal bronchioles constitutes the respiratory or exchange part of the respiratory system.

(iii) During swallowing epiglottis can be covered by a thin elastic cartilaginous ilap calied glottis to prevent the entry of food into the larynx.

(iv) Binding of oxygen with haemoglobin is primarily related to partial pressure of O₂.

...view full instructions

Which of the above two statements are correct?

A
(ii) and (iii)

B
(iii) and (iv)

C
(i) and (ii)

D
(i) and (iv)

Solution

Both statements (i) and (iv) are correct. Asthma is a difficulty in breathing caused by inflammation of the bronchi and bronchioles, and the binding of oxygen to hemoglobin is primarily related to the partial pressure of O₂.

Statements (ii) and (iii) are not correct. The respiratory system starts at the external nostrils and extends to the alveoli, not the terminal bronchioles. The epiglottis is a flap of cartilage that covers the glottis to prevent the entry of food into the larynx during swallowing, not the other way around.
Question 10
4 / -1

The role of mitosis is not merely to divide a cell into two daughter cells but to ensure genetic continuity from one cell generation to another cell generation. The mechanism ensuring genetic continuity is

A
Formation of cells with new chromosomes

B
Formation of two daughter cells

C
Formation of two cells with identical DNA

D
Halving the chromosome number between the two new cells

Solution

All the daughter cells of multicellular organism have the same number and type of chromosomes as parent cells due to equitable distribution of all chromosomes in mitosis. This helps in ensuring genetic continuity.

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Biology Test 279

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Biology Test 279

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SHARING IS CARING

Question 1

Polyadelphous and epipetalous stamens

Monoadelphous and Monothecous anthers

Epiphyllous and Dithecous anthers

Diadelphous and Dithecous anthers

Solution

Question 2

Both A and R are true but R is NOT the correct explanation of A

A is true but R is false

A is false but R is true

Both A and R are true and R is the correct explanation of A

Solution

Question 3

The rhizome is thick, prostrate and branched

Rhizome is a condensed form of stem

The apical bud in rhizome always remains above the ground

The rhizome is aerial with no distinct nodes and internodes

Solution

Question 4

Sclereid

Parenchyma

Collenchyma

Sclerenchyma

Solution

Question 5

(a) - (i), (b) - (iii), (c) - (iv), (d) - (ii)

(a) - (ii), (b) - (i), (c) - (iii), (d) - (iv)

(a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)

(a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)

Solution

Question 6

Attached to oxygen molecules

Bound to hemoglobin as carbaminohaemoglobin

As bicarbonate ions in plasma

Dissolved in plasma

Solution

Question 7

Cigarette smoking may lead to inflammation of bronchi.

Neural signals from pneumotaxic center in pons region of brain can increase the duration of inspiration.

About 90% of carbon dioxide is carried by haemoglobin as carbaminohaemoglobin.

Workers in grinding and stone-breaking industries may suffer from lung fibrosis.

Solution

Question 8

(i) and (ii)

(i) and (v)

(iii) and (iv)

(i), (ii) and (v)

Solution

Question 9

(ii) and (iii)

(iii) and (iv)

(i) and (ii)

(i) and (iv)

Solution

Question 10

Formation of cells with new chromosomes

Formation of two daughter cells

Formation of two cells with identical DNA

Halving the chromosome number between the two new cells

Solution

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