Questions & Answers
Question
AnswersPhloem parenchyma is absent in
(a) Dicots
(b) Monocots
(c) Gymnosperms
(d) All of the above
Answer
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Hint: Monocotyledons (Lilianae sensu Chase & Reveal) are flowering plants (angiosperms) similar to grass and grass, whose seeds usually contain only one embryonic leaf or cotyledon. They are one of the key classes into which the flowering plants have historically been split, with two cotyledons in the remainder of the flowering plants and thus known as dicotyledons or dicots.
Complete answer:
Phloem parenchyma consists of elongated, tapering cylindrical cells with a nucleus and thick cytoplasm. The cell wall consists of cellulose and has pits in which there are contacts of plasmodesmata between the cells. The phloem parenchyma stores food products, such as resins, latex and mucilage, and other substances. In most monocotyledons, Phloem's parenchyma is absent as they store their food in other vacuoles.
The parenchyma tissue is used to store the monocot plants' food for the plant or actually store food in seeds and this is called endosperm and the conduction of the food content is also very easy to prove that the monocot plants typically do not have the phloem parenchyma in their stems.
Additional information: The dicotyledons are one of the two classes into which all the flowering plants or angiosperms were formerly divided, also known as dicots (or more rarely dicotyle). The name refers to one of the group's typical features, namely that two embryonic leaves or cotyledons are present in the seed.
Gymnosperms are plants that are flowerless and growth cones and seeds. As gymnosperm seeds are not encased inside an ovary, the word gymnosperm literally means "naked seed." Instead, on the surface of leaf-like structures called bracts, they rest exposed.
So, the correct answer is ‘(b) Monocots’.
Note: Monocots have at least three of the following: sections of the flower are in 3's or multiples of 3's, leaves are parallel-veined, vascular bundles seem to be distributed across the cross-section of the stem (atactostele), and seeds have one cotyledon.
Complete answer:
Phloem parenchyma consists of elongated, tapering cylindrical cells with a nucleus and thick cytoplasm. The cell wall consists of cellulose and has pits in which there are contacts of plasmodesmata between the cells. The phloem parenchyma stores food products, such as resins, latex and mucilage, and other substances. In most monocotyledons, Phloem's parenchyma is absent as they store their food in other vacuoles.
The parenchyma tissue is used to store the monocot plants' food for the plant or actually store food in seeds and this is called endosperm and the conduction of the food content is also very easy to prove that the monocot plants typically do not have the phloem parenchyma in their stems.
Additional information: The dicotyledons are one of the two classes into which all the flowering plants or angiosperms were formerly divided, also known as dicots (or more rarely dicotyle). The name refers to one of the group's typical features, namely that two embryonic leaves or cotyledons are present in the seed.
Gymnosperms are plants that are flowerless and growth cones and seeds. As gymnosperm seeds are not encased inside an ovary, the word gymnosperm literally means "naked seed." Instead, on the surface of leaf-like structures called bracts, they rest exposed.
So, the correct answer is ‘(b) Monocots’.
Note: Monocots have at least three of the following: sections of the flower are in 3's or multiples of 3's, leaves are parallel-veined, vascular bundles seem to be distributed across the cross-section of the stem (atactostele), and seeds have one cotyledon.