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Test: Morphology of Flowering Plants - Assertion and Reasoning - NEET MCQ


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20 Questions MCQ Test Topic-wise MCQ Tests for NEET - Test: Morphology of Flowering Plants - Assertion and Reasoning

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Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 1

Assertion : Apical meristem of root is subterminal.
Reason : At the terminal end of root, root cap is present.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 1

Root cap is the terminal part of root.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 2

AssertionFibrous root system consists of large number of fine, fibrous roots developing from the base of the stem.

Reason: Fibrous root system is found in dicots only.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 2

In fibrous type of root system, the radicle, primary roots stops growth or becomes rudimentary, while new roots for anchorage and absorption develop from the base of the stem. This type of root formation is observed in Monocots. Therefore assertion is correct, because it is a distinguishing feature of monocots it is not found in dicots. The dicots have tap root system also called the true roots that develop from the radicle. Therefore, reason is false

So, the correct answer is 'Assertion is correct but Reason is incorrect

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Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 3

Assertion : Ginger has a prostrate-growing rhizome.
Reason : Shoot growth is not effected by gravity.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 3

Ginger is horizontal in position and generally branched and producing aerial leaves or shoots above ground and adventitious roots on lower side in favourable season. Thus, shoot growth is not effected by gravity.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 4

Assertion: Avicennia has pneumatophores.
Reason: Pneumatophores help the plant to get oxygen for respiration.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 4

In plants such as Avicennia, growing in swampy areas, many roots come out of the ground and grow vertically upwards. Such roots are called pneumatophores which help to get oxygen for respiration. These roots are also known as respiratory roots.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 5

Assertion: Roots do not possess nodes but no leaves or buds.
Reason: Root branches arise endogenously.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 5

Root is typically a non green underground cylindrical structure forming the descending axis of the plant which gives rise to endogenous branches and does not possess nodes, leaves or buds. Presence of nodes and internodes is the characteristic feature of stems.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 6

Assertion: Root caps are absent in floating aquatic plants.
Reason: Root pockets are present in aquatic plants.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 6

The root cap protects the root meristem from friction of the soil particles. In the process, its outer cells are continuously peeled off and replaced by new cells formed from root meristem. In floating aquatic plants, the root apices possess finger glove-like coverings called root pockets instead of root cap.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 7

Assertion: Root pockets are very similar to root caps.
Reason: Root caps and root pockets have the ability to regenerate.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 7

Root pockets are present in floating aquatic plants. They act as balancers. They are structurally similar to root caps but differ from them, in the fact, that the damaged root pockets are not regenerated. Pandanus, possess multiple root caps with a number of sheaths found successfully one after the other because they are not peeled off in the absence of soil friction.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 8

Assertion: Root hairs are not present on whole of root surface.
Reason: Root hairs absorb water.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 8

Root hair zone is 1-6 cm in length. The root hairs increase the exposed surface of the root for absorption of water and minerals.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 9

Assertion: Deep feeder tap root system is called racemose tap root system.
Reason: It is found in trees.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 9

Deep feeder tap root system has an elongated tap root which penetrates the deeper layers of the soil. It is mostly found in trees. Deep feeder tap root is also called racemose tap root system. In surface feeders, the tap root does not elongate very much. The secondary roots spread to a greater extent. Such a system is also named as cymose tap root system.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 10

Assertion: Orchis root resembles human hand.
Reason: It is an example of fasciculated fleshy roots.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 10

The fleshy roots are thickened like the palm of human hand. They similarly possess finger like outgrowth, e.g., Orchis. They are palmate roots. Fasciculated fleshy roots are the swollen roots or root tubers occurring in clusters.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 11

Assertion: Momordica roots look like necklace.
Reason: Momordica possess moniliform roots.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 11

Moniliform of beaded roots are swollen at regular intervals like beads of a necklace. Hence, the roots have the appearance of necklace. Such roots are found in Discorealata, Momordica charauter etc.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 12

Assertion: Assimilatory roots can photosynthesize.
Reason: Assimilatory roots possess chlorophyll.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 12

Assimilatory roots are green roots (as they contain chlorophyll) which are capable of photosynthesis. e.g., Taeniophyllum, is a leafless epiphytic orchid with thick flattened photosynthetic roots.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 13

Assertion: Epiphytes are called space parasites.
Reason: Their roots possess velamen

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 13

Epiphytes live on the surface of other plants for shelter and space only, hence are also called space parasites. Epiphytic roots possess a covering of dead spongy tissue known as velamen. They are able to absorb water from moist atmosphere, dew and rain with the help of velamen.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 14

Assertion: Pneumataphores are seen in Rhizophora.
Reason: From the region of elongation, some of the epidermal cells form root hairs.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 14

The zone of elongation region of a root lies behind the growing point. The cells of this region are newly formed cells which lose the power of division. They elongate rapidly. This increases the length of the root. The root hair zone represents the zone of differentiation or maturation because of different types of primary tissues differentiates or matures in this region. Some of the outer cells of this zone give rise to lateral tubular outgrowths called root hairs.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 15

Assertion : Bud may form leaves and flowers.
Reason : Bud is a condensed shoot.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 15

A bud is a condensed immature or embryonic shoot having a growing point surrounded by closely placed immature leaves. The largest bud is cabbage. According to their nature, buds can be vegetative, reproductive and mixed.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 16

Assertion: Stems of some plants protect them from browsing animals.
Reason: Axillary buds of stems of these plants are modified into thorns.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 16

Stems are modified to perform different functions like storage, protection, mechanical support and photosynthesis etc. Axillary buds of stems may also get modified into woody, straight and pointed thorns.Thorns are found in many plants such as Citrus, Bougainvillea, etc. They protect plants from browsing animals and also reduce transpiraton .

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 17

Assertion: Stem develops from the hypocotyl of embryo.
Reason: Internodes bear axillary buds.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 17

Stem is usually the above-ground erect ascending part of the plant body that develops from the plumule, grows by means of a terminal bud and shows distinction of nodes and internodes. The nodes bear leaves having auxillary buds.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 18

Assertion: Thorns of Artabotrys are modified floral stalks.
Reason: The upper floral buds develop thorns in Antigonon.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 18

The pedicles or floral stacks of Artabotrys are modified into stiff curved thorns or hooks for climbing. In Antigonon, the flowers occur in bunches in the axils of scale leaves on the floral shoot. The upper floral buds develop into tendrils instead of forming flowers.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 19

Assertion: Prickles lack vascular cylinder.
Reason: Prickles show deposition of silica or calcium carbonate.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 19

Prickles are superficial outgrowths of stem or leaves which do not possess a vascular cylinder. They can be easily pulled off. Bristles are stiff hair which become thickened due to deposition of silica or calcium carbonate.

Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 20

Assertion: Small leaflets are present on the phyllode of Parkinsonia aculeata.
Reason: Phyllode does not bear leaves and flowers.

Detailed Solution for Test: Morphology of Flowering Plants - Assertion and Reasoning - Question 20

Phyllodes do not bear leaves, branches, flowers, etc. In Parkinsonia aculeata, the rachis ends in a spine. Rachis are elongated, flattened and green to function as phyllodes. They bear small leaflets which fall off very easily.

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