Weekly Test On Pinus - Dept Of Botany, Ddcw.
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Pinus belongs to the order
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Cycadales
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Coniferales
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Cordaitales
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Cycadofilicales
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This weekly test from the Dept of Botany at DDCW assesses knowledge on Pinus, covering its classification, anatomy, and physiological features. It evaluates understanding of Pinus's vascular structure, root associations, and reproductive biology, essential for students specializing in plant sciences.
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- 2.
Vascular bundles in pinus are
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Conjoint collateral Open
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Conjoint collateral close
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Conjoint bicollateral open
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Option 4
Correct Answer
A. Conjoint collateral OpenExplanation
The correct answer is "Conjoint collateral Open". In Pinus, the vascular bundles are arranged in a conjoint manner, meaning they are arranged together in a single ring. They are also collateral, meaning the xylem and phloem are located next to each other within the bundle. Additionally, the vascular bundles are open, meaning there is no cambium present between the xylem and phloem.Rate this question:
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- 3.
Type of root association found in Pinus
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Mycorrhizal
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Endomycorrhizal
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Ectomycorrhizal
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Both A and b
Correct Answer
A. Both A and bExplanation
Pinus, commonly known as pine trees, have a type of root association called mycorrhizal. Mycorrhizal association refers to a mutually beneficial relationship between the roots of plants and fungi. In this association, the fungus helps the plant in absorbing nutrients, especially phosphorus, from the soil, while the plant provides the fungus with sugars produced through photosynthesis. Within mycorrhizal association, there are two types: endomycorrhizal and ectomycorrhizal. Endomycorrhizal association occurs when the fungus penetrates and colonizes the root cells, while ectomycorrhizal association occurs when the fungus forms a sheath around the root cells. Therefore, Pinus exhibits both endomycorrhizal and ectomycorrhizal associations, making the answer "Both A and b" correct.Rate this question:
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- 4.
Identify the Pinus stem t.s
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Option 1
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Option 2
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Option 3
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None of the above
Correct Answer
A. Option 1Explanation
Option 1 is the correct answer because it is the only option that mentions "Pinus stem t.s". The other options do not mention anything related to a Pinus stem or its transverse section. Therefore, Option 1 is the most appropriate choice for identifying the Pinus stem transverse section.Rate this question:
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- 5.
Mesophyll tissue of pinus needle is composed of
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Armed parenchyma
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Chlorenchyma
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Spongy parenchyma
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Transfusion tissue
Correct Answer
A. Spongy parenchymaExplanation
The mesophyll tissue of pinus needle is composed of spongy parenchyma. Spongy parenchyma is a type of plant tissue that consists of loosely packed cells with large intercellular spaces. It is responsible for gas exchange and photosynthesis in the leaf. In pinus needles, the spongy parenchyma cells are located towards the lower surface of the needle, allowing for efficient gas exchange and maximizing the absorption of sunlight for photosynthesis.Rate this question:
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- 6.
The male cone of pinus is modified of
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Long shoot
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Needle leaves
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Dwarf shoot
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None of the above
Correct Answer
A. Dwarf shootExplanation
The male cone of Pinus is modified from a dwarf shoot. This means that the male cone is derived from a short, stunted branch or shoot on the pine tree. Unlike the long shoot, needle leaves, or none of the above options, the dwarf shoot specifically refers to the structure from which the male cone develops.Rate this question:
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- 7.
Male gametophyte in pinus is having
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1 prothallial cell
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2 prothallial cells
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3 prothallial cells
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4 prothallial cells
Correct Answer
A. 2 prothallial cellsExplanation
In Pinus, the male gametophyte, also known as pollen grain, consists of two prothallial cells. These cells are responsible for providing nourishment to the developing male gametes. The presence of two prothallial cells is a characteristic feature of the male gametophyte in Pinus.Rate this question:
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- 8.
Among the following which does not belong to sporophytic generation in pinus
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Roots
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Endosperm
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Dwarf shoot
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Long shoot
Correct Answer
A. EndospermExplanation
The sporophytic generation in Pinus refers to the phase of the plant's life cycle where it produces spores. The roots, dwarf shoot, and long shoot are all structures that are part of the sporophytic generation in Pinus. However, the endosperm is not part of the sporophytic generation. Endosperm is a nutrient-rich tissue that is typically found in the seeds of flowering plants, not in the sporophytic generation of Pinus.Rate this question:
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- 9.
Cataphylls are
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Leaves of selaginella
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Scaly leaves of pinus
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Needles of pinu
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Foliar leaves of pinus
Correct Answer
A. Scaly leaves of pinusExplanation
Cataphylls are specialized leaves found in certain plants, including pinus (pine trees). These leaves are scaly in nature and serve various functions such as protection, support, and storage. Unlike true leaves, cataphylls are often smaller, modified, and have a different structure. In the case of pinus, the scaly leaves help reduce water loss and protect the tree from harsh environmental conditions. Therefore, the correct answer is "Scaly leaves of pinus."Rate this question:
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- 10.
Pinus produces
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No seeds
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Flowers
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No Vascular tissues
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Naked seeds in cones
Correct Answer
A. Naked seeds in conesExplanation
Pinus is a type of coniferous tree that produces naked seeds in cones. This means that the seeds are not enclosed within a fruit or protective covering, but rather exposed and attached to the scales of the cones. This adaptation allows for efficient dispersal of the seeds through wind, as the cones open up and release the seeds when they are mature. The presence of naked seeds in cones is a characteristic feature of many coniferous plants, including Pinus.Rate this question:
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- 11.
In pinus, the terminal portion of microsporophyll of male cone is called
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Embryo sac
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Bract scale
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Ovule
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Apophysis
Correct Answer
A. ApophysisExplanation
The correct answer is Apophysis. In Pinus, the terminal portion of the microsporophyll of the male cone is called the apophysis. The apophysis is a specialized structure that helps in the dispersal of pollen grains. It often has a distinct shape or coloration that aids in attracting pollinators.Rate this question:
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- 12.
Microsporophyll of pinus is euivalent to
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Pollen grain of angiosperm
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Stamen
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Male gametophyte
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Inflorescence
Correct Answer
A. StamenExplanation
The microsporophyll of Pinus is equivalent to the stamen. The stamen is the male reproductive organ in angiosperms that produces pollen grains. Similarly, the microsporophyll in Pinus produces microspores, which develop into pollen grains. Therefore, the microsporophyll of Pinus is functionally equivalent to the stamen in angiosperms.Rate this question:
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- 13.
The megasporophyll of pinus consist of
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Both bract and ovuliferous scales
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Only bract scales
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Only ovuliferous scales
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None of the above
Correct Answer
A. Both bract and ovuliferous scalesExplanation
The megasporophyll of pinus consists of both bract and ovuliferous scales. This means that the structure includes both protective scales (bract scales) and scales that bear the ovules (ovuliferous scales).Rate this question:
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- 14.
What nature does pinus needle depicts
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Mesophytic
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Xerophytic
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Hydrophytic
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Sporophytic
Correct Answer
A. XerophyticExplanation
The correct answer is Xerophytic. Xerophytic nature refers to the adaptations of plants to survive in dry and arid conditions. Pinus needles are long, thin, and covered in a waxy cuticle, which helps to reduce water loss through transpiration. This adaptation allows Pinus trees to thrive in xeric environments with limited water availability.Rate this question:
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- 15.
Endospore of pinus is
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Male gametophyte
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Female gametophyte
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Sporophyte
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None of the above
Correct Answer
A. Male gametophyteExplanation
The correct answer is male gametophyte because in Pinus (a type of coniferous plant), the male gametophyte is represented by the pollen grain, which contains the male gametes (sperm cells). The pollen grain is responsible for fertilizing the female gametophyte (represented by the ovule) in order to produce seeds. Therefore, the endospore of Pinus is the male gametophyte.Rate this question:
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- 16.
Annual rings are well seen in
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Pinus wood
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Pinus root
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Pinus cones
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None of the above
Correct Answer
A. Pinus woodExplanation
Annual rings are well seen in Pinus wood because Pinus trees are known for their distinct growth patterns. Each year, a new layer of wood is added to the tree trunk, forming a ring. These rings can be observed when a tree is cut or a sample of wood is taken. By counting the number of rings, one can determine the age of the tree and also gather information about its growth rate and environmental conditions during different years. Therefore, Pinus wood is the correct answer as it clearly exhibits annual ring formation.Rate this question:
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- 17.
Plant of pine is
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Annual herb
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Biannual herb
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Evergreen tree
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Deciduous tree
Correct Answer
A. Evergreen treeExplanation
Pine plants are classified as evergreen trees because they retain their green foliage throughout the year. Unlike deciduous trees that shed their leaves in the fall, evergreen trees maintain their leaves or needles all year round. Pine trees are known for their needle-like leaves that stay green and provide a constant source of photosynthesis. This allows them to thrive in colder climates and adapt to various environmental conditions. Additionally, their evergreen nature enables them to continuously produce oxygen and provide shelter for wildlife throughout the year.Rate this question:
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- 18.
The pollination in pinus is
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Entemophilous
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Anemophilous
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Hydrophilous
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Malscophilous
Correct Answer
A. AnemophilousExplanation
Anemophilous refers to plants that are pollinated by wind. Pinus, commonly known as pine trees, have characteristics that make them well-suited for wind pollination. They produce large amounts of lightweight pollen that can be easily carried by the wind to reach female cones for fertilization. This method of pollination is efficient for pine trees as it allows for long-distance pollen dispersal and increases the chances of successful fertilization. Therefore, the correct answer for the pollination in pinus is anemophilous.Rate this question:
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- 19.
Pinus male and female reproductive structures occur
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On different plant
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On same branches
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On different branches of the same plant
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None of the above
Correct Answer
A. On different branches of the same plantExplanation
In the case of Pinus, the male and female reproductive structures occur on different branches of the same plant. This is known as monoecious reproduction, where both male and female cones are present on the same individual tree. The male cones produce pollen, while the female cones contain ovules that can be fertilized by the pollen. This arrangement allows for cross-pollination between different branches of the same plant, promoting genetic diversity within the species.Rate this question:
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- 20.
Pinus is
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Deciduous
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Dioecious
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Monoecious
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None of these
Correct Answer
A. MonoeciousExplanation
Pinus is a type of tree that belongs to the conifer family. It is known for its evergreen nature, meaning it does not shed its leaves seasonally, so it is not deciduous. Pinus is also known to be monoecious, which means that it has separate male and female reproductive structures on the same tree. This allows for pollination and reproduction to occur within a single tree. Therefore, the correct answer is monoecious.Rate this question:
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- 21.
In pinus male gametes are produced in the pollen tube by the division of which of the following cells
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Body cell
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Stalk cell
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Tube cell
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Prothallial cell
Correct Answer
A. Body cellExplanation
In pinus, male gametes are produced in the pollen tube by the division of the body cell.Rate this question:
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- 22.
Discharge of pollen grains in pinus known as
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Pollen wind
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Yellow shower
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Pollen shower
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Sulphur shower
Correct Answer
A. Sulphur shower -
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