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jyoti

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Assertion : Pinus shows formation of annual rings. Reason : Pinus grows in area of environmental fluctuation

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Angiosperms and gymnosperms both are flowering plants. Reason : Both form seeds.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Cedrus deodara yields highly-valued timber. Reason : Cedrus deodara is resistant to pathogen attack.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Pinus displays the alternation of generations. Reason : The gametophyte is dependent upon the sporophyte phase.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Pinus embryo has two cotyledons. Reason : Pinus shows polyembryony.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : The female cones take much time to mature. Reason : The seeds are shed when the cone is 22 months old.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : The female cones are same in number as male cones. Reason : Male and female cones appears alternately on the same branch of the Pinus.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Male cone of Pinus is equivalent to stamens of angiosperms. Reason : Male cone bears pollen grains.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Pinus is monoecious. Reason : Each sporophyll bears only one microsporangia.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : The mesophyll of Pinus shows no distinction as mesophyll and palisade. Reason : Parenchymatous cells are present in mesophyll of Pinus.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : The scale leaves on the long shoots are called cataphylls. Reason : Cataphylls lack mid rib.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : In gymnosperms, plants show well-developed vessels and fibres. Reason : Companion cells are absent in gymnosperm.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Pinus has a pyramidal appearance. Reason : The older parts of long shoot have scars of fallen dwarf shoots.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : The female cone of Cycas is not true cone. Reason : Its formation checks the growth of the stem.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : All living species of Cycas are dioecious. Reason : Cycas contains male and female cones on the same plant.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Fertilized ovule forms seed. Reason : Ripened ovary forms fruit.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Angiosperms are mostly terrestrial. Reason : Angiosperms are found in plains only.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Pinus wood is used as fuel wood. Reason : Pinus wood can easily be ignited.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : In Pinus, pollination is anemophilous Reason : Pinus bear winged pollen grains.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Angiosperms are most recent plants. Reason : Angiosperms lack archegonia.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Double fertilization is unique to angiosperms. Reason : Triple fusion occurs in double fertilization.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

cAssertion : Angiosperm and Gymnosperms both are spermatophyta. Reason : Angiosperm and Gymnosperms both form triploid endosperm.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Flower is aggregation of sporophylls. Reason : Sporophylls are modified in angiosperms

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Angiosperms lack flagellate male gametes. Reason : Sperms are not dependent on water for fertilization.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Adiantum caudatom is called walking fern. Reason : It can reproduce by its leaf tips.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Stamens are comparable to microsporophylls. Reason : Ovules are comparable to megasporophylls.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : More dicot species are known than that of monocot species. Reason : Two cotyledons are present in the dicot plants.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Biennial plants flower in two year. Reason : The biennial plants live for two years.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Angiosperms contain microsporophyll and megasporophyll. Reason : Microsporophyll and megasporophyll forms microspore and megaspore respectively.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Pinus is heterosporous. Reason : Microspore and megaspore are present in them.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : “Upper Carboniferous” period is also called “Age of Ferns”. Reason : Ferns dominated during the period.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Cycas embryo has many cotyledons. Reason : Compound suspensor is formed due to fusion of suspensors of proembryos.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : The interval between pollination and fertilization is about 4 months in Cycas. Reason : Cycas show retention of swimming sperm.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : The male of Cycas change in size when the microspores became mature. Reason : The microspores are dispersed by wind.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

52. When a liquid that is immiscible with was steam distilled at

95. 2 ° C at a total pressure of 99.652 KPa. The distillate contained 1.27 g of the liquid per...

51. Low concentration of oxygen in the blood and tissues of people living at high altitude is due to…..

a.  Low temperature b. Low atmospheric pressure c. High atmospheric pressure d. Both low temperature and high atomospheric pressure Ans....

Assertion : Xylem of gymnosperms consists of tracheids and no vessels. Reason : Phloem of gymnosperms consists of phloem parenchyma, companion cells and sieve tubes.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

Assertion : Cycas has two types of root-tap root system and coralloid roots. Reason : Coralloid root contains Anabaena.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

50. Pick out the wrong statement (s)

1.. Vapour pressure of a liquid is the measure of the strengh of intermolecular attttactive forces 2. Surface tension of...

Assertion : In leptosporangiate development, sporangia are formed from a group of initials. Reason : Eusporangiate development of sporangia starts from single initial.

(a)       If both the assertion and the reason are true and the reason is a correct explanation of the assertion...

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