17640.The first node indicates point of attachment of ______ to embryo axis
Plumule
Radicle
Cotyledons
All of the above
17641.Syngamy refers to
Fusion of one of the sperm with synergid
Fusion of one male gamete with female gamete
Fusion of male gamete with secondary nucleus
Fusion of one male gamete with egg and other male gamete with secondary nucleus
17643.Free nuclear divisions occurs in
Cellular endosperm
Nuclear endosperm
Helobial endosperm
Both 2 and 3
17644.Suspensor formed during development of dicot embryo is
2-3 celled
3-4 celled
5-6 celled
6-10 celled
17645.In monocot seeds, radicle is covered by a protective covering called
Coleoptile
Coleorrhiza
Scutellum
Aleurone layer
17646.The pollen are liberated in Cassytha by:
Transverse dehiscence
Longitudinal dehiscence
Porous dehiscence
Valvular dehiscence
17649.The type of seed in which endosperm is completely utilized by developing embryo
Endospermic seed
Non endospermic sees
Albuminous seed
None of these
17650.There are 10 flowers in one individual plant of Crotalaria. In each microsporangium of every stamen of all the flowers, there are 30 microspore mother cells. How many pollen grains are formed from that plant?
48,000
24,000
10,000
4,000
17652.Agamospermy includes
Non recurrent apomixis
Recurrent apomixis
Adventive polyembryony
All the above
17654.Pick out the wrong statement.
Double fertilization is unique to gymnosperms and monocotyledons
Sequoia, a gymnosperm, is one of the tallest trees
Phaeophyceae members possess chlorophyll a, c, carotenoids and xanthophylls
Moss is gametophyte which consists of two stages namely, protonema stage and leafy stage
17656.Plants identical to mother plant can be obtained through
Stem cutting
Seed
Leaf cutting
Both 1 and 3
17658.Population of genetically similar plants obtained from same invidual by vegatative method
Propagule
Bud
Clone
Callus
17659.The nucellus in the ovule is often called
megagametophyte.
megasporangium.
megasporophyte.
female sporogenous tissue.
17664.Buds develops in Bryophyllum daigremonthianum
From marginal notches when leaf falls on ground
From marginal notches while attached to plant
From marginal notches of leaves
From the place of injury
17665.Stem cuttings are treated wih IAA or NAA to promote
Development of buds
Formation of root
Formation of shoot
Both 2 and 3
17666.The technique of joining together parts of two plants to form one composite plant is
Budding
Cutting
Crafting
Sowing
17667.The diagram given by the side represents the sectional view of
Amphitropous ovule
Orthotropous ovule
Anatropous ovule
Campylotropous ovule
17669.Male gametes in angiosperms are formed by the division of:
Generative cell
Microspore
Microspore mother cell
Vegetative cell
17673.In which of following, diameter of stock is larger than scion
Side grafting
Tongue grafting
Wedge grafting
Crown grafting
17674.Grafting technique is successful between two plants having
Viable seed
Parenchymatous tissue
Active buds
Active vascular cambium
17675.Sweet potato and potato are similar to each other in having
Nature of stem
Storage food
Origin of root
Modified part
17678.Pollen grain representes
Male gametophyte
Partly developed male gametophyte
Female gametophyte
Male gamete
17679.Innermost layer of anther is tapetum, whose function
Protection
Nutrition
Mechanical support
Help in dehiscence
17681.The fully formed male gametophyte of angiosperms contains
one generative cell, one tube cell and one body cell.
one generative cell, one tube cell and one stalk cell.
one tube nucleus, one vegetative cell and one generative cell.
one vegetative nucleus, and two male gametes.
17682.If the endosperm cells of an angiosperm seed sre pentaploid, then such a seed may have been formed by which of the following parents?
Triploid female and diploid male.
Diploid male and tetraploid female.
Both parents tetraploid.
Triploid male and diploid female.
17683.The continued existence of any race can be basically attributed to the
reprodution
domestication
conservation
None of these