Recent questions tagged class11

Regarding Phylum Coelenterata (Cnidaria) :

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Choose the odd one out :

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Regarding reproduction in sponges:

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Sponges have a water transport or canal system which is helpful in:

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Non-chordates are:

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1. Animals with notochord are called chordates 2. Those animals which do not form this structure are called hemichordates Regarding 1 and 2:

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Regarding Notochord are all correct except:

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Choose the odd one out (regarding coelem):

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Choose the odd one out (regarding coelem):

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In animals: 1. Presence or absence of a cavity between the body wall and the gut wall is not important in classification. 2. The body cavity, which is lined by mesoderm is called coelom.

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Regarding complexity of the circulatory system in animals: 1. open type - blood is pumped out of the heart and the cells and tissues are directly bathed in it 2. closed type - blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries).

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Regarding complexity of digestive system in animals: 1. An incomplete digestive system has single opening to the outside of the body that serves as both mouth and anus. 2. A complete digestive system has two openings, mouth and anus.

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Assertion (A): The digestive system in Platyhelminthes is complete. Reason (R): The digestive system in Platyhelminthes has a single opening to the outside of the body that serves as both mouth and anus Regarding (A) and (R) :

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Classification of animals is based on all except:

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Syngamy and Triple fusion are respectively:

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In Bryophytes: 1. The plant body of liverworts is thalloid and dorsiventral. 2. The plant body of mosses have upright, slender axes bearing spirally arranged leaves. Regarding 1 and 2:

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Regarding Bryophytes incorrect one is:

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Regardnig Alternation of generations choose the incorrect one:

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Plant life cycle and alternation of generations: 1. The haploid plant body represents a gametophyte. 2. The haploid plant body produces gametes by meiosis. Regarding 1 and 2:

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In plants: Assertion (A): The body of a plant may be - haploid sporophyte and diploid gametophyte. Reason (R): In plants, both haploid and diploid cells can divide by mitosis. Regarding (A) and (R) :

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Identify the correct statement:

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Identify the correct sequence:

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Each embryo-sac has a three-celled egg apparatus that includes –

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Angiosperms include:

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The male and the female gametophytes do not have an independent free-living existence and they remain within the sporangia retained on the sporophytes in

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In gymnosperms : 1.The megaspore mother cell is differentiated from few of the cells of the nucellus. 2.The nucellus is protected by envelopes and the composite structure is female cone. Regarding 1 and 2:

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In Gymnosperms : 1. The male or female cones or strobili may be borne on the same tree as in Pinus 2. In cycas male cones and megasporophylls are borne on different trees. Regarding 1 and 2:

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1. One of the angiosperms, the giant redwood tree Sequoia is one of the tallest tree species. 2. The leaves in gymnosperms are ill-adapted to withstand extremes of temperature, humidity and wind. Regarding 1 and 2:

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In conifers (Gymnosperms):

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Gymnosperms include:

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The gymnosperms are plants in which:

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The pteridophytes are further classified into following classes except:

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Assertion (A): The spread of pteridophytes is unrestricted and have spread to many geographical regions Reason (R): The gametophytes of pteridophytes require cool, damp, shady places to grow and need for water for fertilisation Regarding (A) and (R) :

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In pteridophytes: 1. The sporangia produce spores by meiosis in spore mother cells. 2. The spores germinate to give rise to small, multicellular,free-living, mostly photosynthetic thalloid gametophytes called prothallus. Regarding 1 and 2:

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Choose the incorrect statement:

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Pteridophytes include:

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Pteridophytes are used for:

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Choose the odd one out:

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1. The sporophyte in liverworts is more elaborate than that in mosses. 2. The mosses have an elaborate mechanism of spore dispersal. Regarding 1 and 2:

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The predominant stage of the life cycle of a moss is the gametophyte which consists of

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Regarding liverworts : 1. The plant body of a liverwort is thalloid - dorsiventral and closely appressed to the substrate. 2. The leafy members have tiny leaf-like appendages in two rows on the stem-like structures.

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Assertion (A): Species of Sphagnum, a moss, is used as packing material for trans-shipment of living material Reason (R): They have capacity to hold water. Regarding (A) and (R) :

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1. Regarding the economic importance of mosses: Species of Sphagnum, a moss:

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Assertion (A): Mosses prevent soil erosion. Reason (R): Mosses form dense mats on the soil, they reduce the impact of falling rain Regarding (A) and (R) :

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Assertion (A): The main plant body of the bryophyte is called a gametophyte. Reason (R): The main plant body of the bryophyte is diploid. It produces gametes after meiosis Regarding (A) and (R) :

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1. Bryophytes play an important role in plant succession on bare rocks or soil. 2. The plant body of bryophytes is more differentiated than that of algae. Regarding 1 and 2 :

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Assertion (A):Bryophytes are also called amphibians of the plant kingdom Reason (R): Bryophytes can grow in both soil and water Regarding (A) and (R) :

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Bryophytes are found commonly growing:

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Regarding Floridean starch:

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In Rhodophyceae:

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