HOTs Sexual Reproduction In Flowering Plants Class 12 Biology

Please refer to Sexual Reproduction In Flowering Plants HOTs Class 12 Biology provided below with Sexual Reproduction In Flowering Plants. All HOTs for Class 12 Biology with answers provided below have been designed as per the latest syllabus and examination petter issued by CBSE, NCERT, KVS. Students of Standard 12 Biology should learn the solved HOTS for Class 12 Biology provided below to gain better marks in examinations.

Sexual Reproduction In Flowering Plants Class 12 Biology HOTs

Question. Attractants and rewards are required for 
(a) anemophily
(b) entomophily
(c) hydrophily
(d) cleistogamy

Question. True fruit is directly derived from
(a) stem
(b) root
(c) ovary
(d) None of these

Question. False fruit is a fruit in which
(a) only ovary take part in fruit development
(b) only embryo take part in fruit development
(c) only chalazal cells take part in fruit development
(d) ovary and other floral part are included in fruit development

Question. Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
(a) Banana
(b) Yucca
(c) Hydrilla
(d) Viola

Question. Pollen grains can be stored for several years in liquid nitrogen having temperature of
(a) – 196°C
(b) – 80°C
(c) – 120°C
(d) – 160°C

Question. The innermost layer of microsporangium is
(a) tapetum
(b) endothecium
(c) middle layer
(d) epidermis

Question. Identify A to F in the diagram given below. 

(a) A–Egg, B–Filiform apparatus, C–Synergid, D–Antipodals, E–Polar nuclei, F–Central cell
(b) A–Egg, B–Synergid, C–Filiform apparatus, D–Antipodals, E–Central cell, F–Polar nuclei
(c) A–Central cell, B–Egg, C–Synergid, D–Antipodals, E–Filiform apparatus, F–Polar nuclei
(d) A–Filiform apparatus, B–Synergid, C–Egg, D–Central cell, E–Polar nuclei, F–Antipodals

Question. Filiform apparatus are
(a) special cellular thickenings at antipodal cell
(b) special cellular thickenings at the micropylar end
(c) special cellular thickenings at synergid cells
(d) special cellular thickenings at nuclear end

Question. Double fertilisation is
(a) fusion of two male gametes with one egg
(b) fusion of one male gamete with two polar nuclei
(c) fusion of two male gametes of pollen tube with two different eggs
(d) syngamy and triple fusion

Question. Centre of each microsporangium is occupied by
(a) sporogenous tissue
(b) tapetum
(c) central tissue
(d) microspore mother cell

Question. Number of seeds are equal to the
(a) number of ovules
(b) number of ovaries
(c) Both (a) and (b)
(d) None of these

Question. Persistent nucellus in the seed is known as 
(a) perisperm
(b) hilum
(c) tegmen
(d) chalaza

Question. In the given diagram of pistil, in which part fertilisation takes place?  

(a) D
(b) C
(c) B
(d) A

Question. Wind pollination is common in 
(a) lilies
(b) grasses
(c) orchids
(d) legumes

Question. Out of the following choose the post-fertilisation event(s).
(a) Endospermogenesis
(b) Embryogenesis
(c) Both (a) and (b)
(d) Megasporogenesis

Question. The morphological nature of the edible part of coconut is 
(a) perisperm
(b) cotyledon
(c) endosperm
(d) pericarp

Question. Pollination in water hyacinth and water lily is brought about by the agency of NEET 2016
(a) water
(b) insects or wind
(c) birds
(d) bats

Question. Autogamy can occur in a chasmogamous flower if
(a) pollen matures before maturity of ovule
(b) ovules mature before maturity of pollen
(c) Both pollen and ovules mature simultaneously
(d) Both anther and stigma are of equal lengths

Question. Choose the correct statement from the following.
(a) Cleistogamous flowers always exhibit autogamy
(b) Chasmogamous flowers always exhibit geitonogamy
(c) Cleistogamous flowers exhibit both autogamy and geitonogamy
(d) Chasmogamous flowers never exhibit autogamy

Question. Identify the type of pistil in the diagram. 

(a) Multicarpellary, apocarpous
(b) Multicarpellary, syncarpous
(c) Multicarpellary, pistillate
(d) Monocarpellary, apocarpous

Question. Embryo sac is to ovule as …… is to an anther.
(a) stamen
(b) filament
(c) pollen grain
(d) androecium

Question. A dicotyledonous plant bears flowers, but never produces fruits and seeds. The most probable cause for the above situation is
(a) plant is dioecious and bears only pistillate flowers
(b) plant is dioecious and bears both pistillate and staminate flowers
(c) plant is monoecious
(d) plant is dioecious and bears only staminate flowers

Question. Identify the type of pistil in the diagram alongside. 

(a) Monocarpellary, syncarpous
(b) Monocarpellary, apocarpous
(c) Multicarpellary, syncarpous
(d) Multicarpellary, apocarpus

Question. Identify A to I in the given diagram. 

(a) A–Chalazal end, B–Embryo sac, C–Nucellus, D–Inner integuments, E–Outer integuments, F–Micropylar pole, G–Micropyle, H–Funicle, I–Hilum
(b) A–Inner integuments, B–Nucellus, C–Embryo sac, D–Chalazal end, E–Hilum, F–Funicle, G–Micropyle, H–Micropylar end, I–Outer integuments
(c) A–Hilum, B–Funicle, C–Micropyle, D–Micropylar pole, E–Outer integuments, F–Inner integuments, G–Nucellus, H–Embryo sac, I–Chalazal pole
(d) A–Micropylar end, B–Micropyle, C–Funicle, D–Hilum, E–Outer integuments, F–Inner integuments, G–Nucellus, H–Embryo sac, I–Chalazal end

Question. Type of cell division takes place in apomixis is
(a) reductional
(b) meiosis
(c) Both (a) and (b)
(d) mitosis

Question. Vegetative/Asexual reproduction and apomixis are common to each other in
(a) type of cell division
(b) clone nature of offspring
(c) Both (a) and (b)
(d) only in dicot plant

Question. Chalazal pole is present
(a) opposite to micropyle
(b) at the origin of integuments
(c) opposite to nucellus
(d) near the embryo sac

Question. Mass of cells enclosed by integuments is called
(a) nucellus
(b) embryo
(c) ova
(d) pollen

Question. The most common abiotic pollinating agency in flowering plant is/ are
(a) water
(b) wind
(c) Both (a) and (b)
(d) None of these

Question. From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
(a) Monoecious plant bearing unisexual flowers
(b) Dioecious plant bearing only male or female flowers
(c) Monoecious plant with bisexual flowers
(d) Dioecious plant with bisexual flowers

Question. In an embryo sac, the cells that degenerate after fertilisation are
(a) synergids and primary endosperm cell
(b) synergids and antipodals
(c) antipodals and primary endosperm cell
(d) egg and antipodals

Question. Characteristic of wind pollinated pollens is, they are
(a) non-sticky
(b) light
(c) produced in large number
(d) All of the above

Question. Embryo sac is also called
(a) female gamete
(b) synergids
(c) female gametophyte
(d) egg of angiosperm

Question. While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps would not be relevant?
(a) Bagging of female flower
(b) Dusting of pollen on stigma
(c) Emasculation
(d) Collection of pollen

Question. In the embryos of a typical dicot and a grass, true homologous structures are
(a) coleorhiza and coleoptile
(b) coleoptile and scutellum
(c) cotyledons and scutellum
(d) hypocotyl and radicle

Question. Megasporogenesis is
(a) formation of fruits
(b) formation of seeds
(c) formation of megaspores
(d) Both (b) and (c)

Question. Intine is made up of
(a) cellulose
(b) pectin
(c) Both (a) and (b)
(d) protein

Question. A dioecious flowering plant prevents both 
(a) autogamy and xenogamy
(b) autogamy and geitonogamy
(c) geitonogamy and xenogamy
(d) cleistogamy and xenogamy

Question. In which of the following, both autogamy and geitonogamy are prevented?
(a) Wheat
(b) Papaya
(c) Castor
(d) Maize

Question. Exine of pollen is made up of
(a) sporopollenin
(b) sporogenous tissue
(c) spongiform tissue
(d) inorganic material

Question. Megaspore mother cell is found near the region of
(a) micropyle
(b) chalaza
(c) nucellus
(d) integuments

Question. In majority of angiosperms NEET 2016
(a) egg has a filiform apparatus
(b) there are numerous antipodal cells
(c) reduction division occurs in the megaspore mother cells
(d) a small central cell is present in the embryo sac

Question. The ability of the pistil to recognise the pollen followed by its acceptance or rejection is the result of a continuous dialogue between pollen grain and the pistil. Which of the following chemicals mainly takes part in this interaction.
(a) Nucleotides
(b) Proteins
(c) Minerals
(d) Lipid or Inulin

Question. Coconut water from a tender coconut is
(a) immature embryo 
(b) free-nuclear endosperm
(c) innermost layers of the seed coat
(d) degenerated nucellus

Question. Endosperm is consumed by developing embryo in the seed of
(a) pea
(b) maize
(c) coconut
(d) castor

Question. The process of removal of anther from the flower bud before it dehisces is called as
(a) emasculation
(b) bagging
(c) embryo rescue
(d) budding

Question. In angiosperms, microsporogenesis and megasporogenesis
(a) occur in anther
(b) form gametes without further divisions
(c) involves meiosis
(d) occur in ovule

Question. Functional megaspore in an angiosperm develops into
(a) ovule
(b) endosperm
(c) embryo sac
(d) embryo

Question. The cylindrical portion below the cotyledons is …A… that terminates to …B… and its tip is called …C… . A, B and C here refers to
(a) A–radicle, B–hypocotyl, C–root cap
(b) A–root cap, B–radicle, C–hypocotyl
(c) A–hypocotyl, B–root cap, C–radicle
(d) A–hypocotyl, B–radicle, C–root cap

Question. The wheat grain has an embryo with one large, shield-shaped cotyledon known as
(a) epiblast
(b) coleorhiza
(c) scutellum
(d) caleoptile