Answer: opuntia has a stem which serve the function of water and it also store the photosynthesis.it is actually leaf which gets modified to spines . it offers defence and protection to plant part.
Is Opuntia leaf modified?
Hence, the correct answer is option A. In opuntia, the spines are a modification of leaf.
What are the leaves of cactus modified into?
In cactus, leaves are modified into spines. It is the green stem that performs all the functions to be performed by leaves including photosynthesis.
What are the advantages of leaves modified into spines?
Answer: Most species of cacti have lost true leaves, retaining only spines, which are highly modified leaves. As well as defending against herbivores, spines help prevent water loss by reducing air flow close to the cactus and providing some shade. In the absence of leaves, enlarged stems carry out photosynthesis.
In which plant leaves are modified into tendrils?
In the garden pea, it is only the terminal leaflets that are modified to become tendrils. In other plants such as the yellow vetch (Lathyrus aphaca), the whole leaf is modified to become tendrils while the stipules become enlarged and carry out photosynthesis.
Why are leaves modified into spines in prickly pear?
Leaves of certain plants become wholly or partially modified for defensive purpose into sharp, pointed structures known as spines. Thus, in prickly pear the minute leaves of the axillary bud are modified into spines. … Their function is to protect the axillary bud that they bear in their axil.
Why are the leaf of a cactus plant modified into spines?
Its leaves are modified to extremely small-sized spines to minimize the surface area from which water can be lost. Its stem takes up the role of photosynthesis thus allowing it to survive in deserts. Hence, the Cactus is the correct answer here.
Which modified stem is used for the storage of food?
The stem modification that has enlarged fleshy leaves emerging from the stem or surrounding the base of the stem is called a bulb; it is also used to store food. Aerial modifications of stems include tendrils, thorns, bulbils, and cladodes..
Are there any leaves present in Opuntia?
Answer: Opuntia is a xerophytic plant, in which leaves are modified into spine to reduce the rate oftranspiration and they do not perform the photosynthesis at all. … They are present in axil of scale leaves while true leaves are reduced to scales or spines.
Is tendrils of cucumber stem modification?
Tendrils are spirally coiled or claw-like structure by which a plant grasps an object or clings to it. A tendril may be a modified stem or a modified leaf. In the Cucurbitaceae (Cucumber family), tendrils are leaves, modified from their base.
Which is a modified leaf?
In Nepenthes, the leaves are modified into pitchers. Hence, it is also called as pitcher plant. In Pisum sativum (pea), the upper leaflet is modified into tendril. In cactus, the leaves are modified into spine. They help in protection.
What is Cladode example?
Examples of plants with cladodes: (left) Engelmann prickly pear (Opuntia engelmannii), (centre) butcher’s broom (Ruscus aculeatus), and (right) asparagus (Asparagus) shoots. … The stem does not bear leaves but rather becomes flattened and leaflike, assuming the plant’s photosynthetic functions.
Why is sunflower not a flower?
Sunflower is not a flower, but it is a kind of inflorescence called capitulum in which the receptacle is flattened. It bears numerous sessile and small florets. The youngest floret is in the centre and oldest lies at the periphery. Whole cluster of florets gets surrounded by bracts, known as involucre.
Is the main function of the leaf?
Leaf function
The main function of a leaf is to produce food for the plant by photosynthesis. … Oxygen is passed into the atmosphere through stomata—pores in the leaf surface. photosynthesis. Green plants such as trees use carbon dioxide, sunlight, and water to create sugars.
What is the purpose of a modified cactus?
The leaves of cactus plant are modified into spine because it helps them to lose less water during transpiration and also protect from beings eaten by animal.
What are the two main functions of leaves?
The two main functions performed by the leaf are photosynthesis and transpiration. Photosynthesis is the process by which green plants make their food from carbon dioxide and water in the presence of sunlight.
How are leaves modified to suit a purpose?
Leaves can be modified in the form of spines that reduce water loss and also act as a defence. Some are modified into tendrils to provide support to the plant. Some leaves are thick that help in water storage. Some are modified to catch and digest insects.
Is become modified into spines in?
Explanation: In Opuntia, leaves become modified into spines to avoid transpiration so as to save water for desert adaptation. The stems of this plant appear like – leaf, termed as- phylloclades which perform the process of photosynthesis.
What is the importance of veins in leaves?
The veins in a leaf represent the vascular structure of the organ, extending into the leaf via the petiole and providing transportation of water and nutrients between leaf and stem, and play a crucial role in the maintenance of leaf water status and photosynthetic capacity.
What is the arrangement of leaves on a stem called?
The arrangement of leaves on a stem is known as phyllotaxy; leaves can be classified as either alternate, spiral, opposite, or whorled.
What are the example of tendrils?
Its anatomy may be of stem tissue or of leafstalk tissue. Common examples of tendril-producing plants are the grape, members of the squash or melon family (Cucurbitaceae), the sweet pea (Lathyrus odoratus), and the passionflowers (Passiflora species).
Which part of the leaf is called petiole?
The petiole is a stalk that connects the blade with the leaf base. The blade is the major photosynthetic surface of the plant and appears green and flattened in a plane perpendicular to the stem.