jyotiFlame Institute

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 (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion …

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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 gram of water. What will be the molar mass of the liquid if the vapour pressure of water is 85.140 …

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. b Explanation : Low concentration of oxygen in the blood and tissues of people living at high altitude is due …

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

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

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 a liquid acts perpendicular to the surface of the liquid 3. Vapour pressure of all liquid is same at their …