Morphology of Flowering Plants Test 17

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Morphology of Flowering Plants Test 17

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Question 1
1 / -0

Pneumatophores take part in, which of the following functions?

A
Excretion

B
Feeding

C
Respiration

D
Reproduction

Solution

Pneumatophores are erect roots that are some form of upward appendage or extension of the underground root system. Because these roots are exposed at least part of the day and not submerged underwater, the root system can obtain oxygen in an otherwise anaerobic substrate. In Avicennia and Sonneratia species, the pneumatophores are erect side branches of the horizontal roots which grow just below the soil. So, pneumatophores take part in respiration and not in excretion, feeding and reproduction.
Thus, the correct answer is option C.
Question 2
1 / -0

Number of female flowers in a cyathium inflorescence is

A
1

B
2

C
3

D
Several

Solution

Cyathium inflorescence - Here, the inflorescence is highly reduced. It has a cup shaped receptacle formed by the fusion of five bracts. On the surface of this cup, generally a yellow coloured nectar secreting gland is present. A single female flower arises from the centre of the cup. It is highly reduced and is borne on a long stalk. The male flowers are highly reduced and are produced in a scorpioid manner from the axil of each bract e.g., Euphorbia pulcherrima.
Therefore, the correct answer is option A.
Question 3
1 / -0

Which of the following part of cauliflower is used as vegetable?

A
Terminal bud with immature leaves

B
Unripe inflorescence

C
Fruit

D
Swollen stem

Solution

Cauliflower is one of several vegetables in the species Brassica oleracea, in the family Brassicaceae. It is an annual plant that reproduces by seed. Typically, only the head (the white curd) is eaten. The cauliflower head is composed of a white inflorescence meristem. It is an unriped inflorescence. Thus, the correct answer is option B.
Question 4
1 / -0

Plants growing on high walls or on tall trees obtain water from:

A
The source on which they are growing

B
The land

C
Water bodies

D
The moisture present in the atmosphere

Solution

An epiphyte is an organism that grows on the surface of tall trees or on high walls, derives its moisture and nutrients from the air, rain, water (in marine environments) or from debris accumulating around it. Epiphytes take part in nutrient cycles and add to both the diversity and biomass of the ecosystem.
So, the correct answer is 'The moisture present in the atmosphere'.
Question 5
1 / -0

Hypostomatous (stomata on the lower surface) plants are usually

A
Aquatic plants

B
Semi-aquatic plants

C
Non-aquatic plants

D
All of the above
Solution
- A leaf is said to be hypostomatous where stomata are present on abaxial surface only (lower surface). Most tree species of dicotyledons possess such leaves. Ex. Ficus, Nerium etc.
- Hypostomatous plants are non-aquatic plants in which stomata are present on the lower surface because their function is to regulate the amount of water in the leaf and being on the bottom prevents it from absorbing too much water in the rain or transpirating too much in the sun.
So, the correct answer is 'Non-aquatic plants'.
Question 6
1 / -0

Leguminosae is important for

A
Vegetables

B
Pulses

C
Oils

D
Fibres

Solution

Leguminosae is commonly known as grain, legumes or pea family. It is important for pulses. Grain legumes are cultivated for pulses.
Question 7
1 / -0

The apical meristem of the root is present

A
Only in radicals

B
Only in tap roots

C
Only in adventitious roots

D
In all the roots

Solution

A meristem is the tissue in most plants containing undifferentiated cells (meristematic cells), found in zones of the plant where growth can take place. Meristematic cells give rise to various organs of the plant and keep the plant growing. The shoot apical meristem (SAM) gives rise to organs like the leaves and flowers, while the root apical meristem (RAM) provides the meristematic cells for the future root growth. Unlike the shoot apical meristem, the root apical meristem produces cells in two dimensions. It harbors two pools of stem cells around an organizing centre called as the quiescent center (QC) cells and together produce most of the cells in an adult root. The apical meristem of the root is present in all roots.
Thus, the correct answer is option D.
Question 8
1 / -0

Root apex has a zone of slow dividing cells in the middle of rapidly dividing cells. It is

A
Quiescent centre

B
Non-meristematic centre

C
Dormant centre

D
None of the above

Solution

The quiescent centre (QC) is a small group of cells with low mitotic activity (they divide sometimes, but only rarely). QC's are to be found at the tips of growing roots, in the root meristem, and are typically surrounded by groups of initial cells. Through rounds of cell division, these initial cells give rise to the various tissues of the root and so there are usually vascular initials, pericycle initials, cortex initials etc. It is thought that the QC sends out signals to these initial cells to ensure that they remain in an initial state and keep dividing to produce whatever tissue they are responsible for. So, root apex has a zone of slow dividing cells in the middle of rapidly dividing cells which is called as quiescent centre and not dormant centre or non-meristematic zone.
Thus, the correct answer is option A.
Question 9
1 / -0

Modern day (advanced) plants are

A
Monocots

B
Dicots

C
Gnetales

D
Ferns

Solution

Plants are classified into two main groups: the bryophytes (nonvascular plants) and the tracheophytes (vascular plants). The tracheophytes include ferns, gymnosperms and angiosperms, and are characterized by specialized vascular tissues- the phloem and xylem. The study of living species suggests that angiosperms evolved from the gnetophytes, a group of gymnosperms. however, the oldest known angiosperms were a diverse group of plants called magnoliids from which dicots and monocots are evolved. Monocots are more advanced plants than dicot.
Question 10
1 / -0

Root apex is sub-terminal because it is

A
Covered by root hairs

B
Covered by root cap

C
Covered by epidermis

D
Under the soil

Solution

The terminal region of the root though is known as root apex. The apical region is sub-terminal because the root apex is protected by a root cap. The root cap protects the growing tip in the plants.
Thus, the correct answer is option B.

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Morphology of Flowering Plants Test 17

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Morphology of Flowering Plants Test 17

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SHARING IS CARING

Question 1

Excretion

Feeding

Respiration

Reproduction

Solution

Question 2

1

2

3

Several

Solution

Question 3

Terminal bud with immature leaves

Unripe inflorescence

Fruit

Swollen stem

Solution

Question 4

The source on which they are growing

The land

Water bodies

The moisture present in the atmosphere

Solution

Question 5

Aquatic plants

Semi-aquatic plants

Non-aquatic plants

All of the above

Solution

Question 6

Vegetables

Pulses

Oils

Fibres

Solution

Question 7

Only in radicals

Only in tap roots

Only in adventitious roots

In all the roots

Solution

Question 8

Quiescent centre

Non-meristematic centre

Dormant centre

None of the above

Solution

Question 9

Monocots

Dicots

Gnetales

Ferns

Solution

Question 10

Covered by root hairs

Covered by root cap

Covered by epidermis

Under the soil

Solution

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