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Sexual Reproduction in Flowering Plants Class 12 MCQs Questions with Answers
Multiple Choice Type Questions
Question 1.
In a type of apomixis known as adventive embryony, embryos develop directly from the
(a) Nucellus or integuments
(b) Zygote
(c) Synergids or antipodals in an embryo sac
(d) Accessory embryo sacs in the ovule
Answer
Answer: (a) Nucellus or integuments
Question 2.
In some plants anthers and stigma grow and mature at same time. This phenomenon is called
(a) Homogamy
(b) Syngamy
(c) Allogamy
(d) Fusion
Answer
Answer: (a) Homogamy
Question 3.
In which one pair both the plants can be vegetatively propagated by leaf segments?
(a) Agave and Kalanchoe
(b) Bryophyllum and Kalanchoe
(c) Asparagus and Bryophyllum
(d) Chrysanthemum and Agave
Answer
Answer: (b) Bryophyllum and Kalanchoe
Question 4.
Through which cell of the embryo sac, does the pollen . tube enter the embryo sac?
(a) Egg cell
(b) Persistant synergid
(c) Degenerated synergid
(d) Central cell
Answer
Answer: (c) Degenerated synergid
Question 5.
Anthersis is a phenomenon which refers to
(a) Formation of pollen
(b) Development of anther
(c) Opening of flower bud
(d) Reception of pollen by stigma
Answer
Answer: (c) Opening of flower bud
Question 6.
The pollen tube usually enters the embryosac
(a) Through one of the synergids
(b) By directly penetrating the egg
(c) Between one synergid and central cell
(d) By Jtnocking off the antipodal cells
Answer
Answer: (a) Through one of the synergids
Question 7.
Milky water of tender coconut is
(a) Liquid gametes
(b) Liquid nucellus
(c) Liquid female gametophyte
(d) Liquid endosperm
Answer
Answer: (d) Liquid endosperm
Question 8.
The aleurone layer in maize grain is specially rich in :
(a) Starch
(b) Lipids
(c) Auxims
(d) Proteins
Answer
Answer: (d) Proteins
Question 9.
Pollen grains are able to withstand extremes of temperature and dissication because their exine is composed of
(a) Cutin
(b) Suberin
(c) Sporopollenin
(d) Callose
Answer
Answer: (c) Sporopollenin
Question 10.
Fertilization is depicted by the condition
(a) N → 2N
(b) 2N → N
(c) 2N → 4N
(d) 4N → 2N
Answer
Answer: (a) N → 2N
Question 11.
What is the direction of micropyle in anatropous ovule?
(a) Upward
(b) Downward
(c) Right
(d) Left
Answer
Answer: (b) Downward
Question 12.
Vegetative propagation by bulbils occur in
(a) Agave
(b) Gingiber
(c) Vallisneria
(d) Curcuma
Answer
Answer: (a) Agave
Question 13.
The arrangement of megaspores in a tetrad in an Angiosperm is
(a) Decussate
(b) Tetrahedral
(c) Linear
(d) Isobilateral
Answer
Answer: (c) Linear
Question 14.
In angiosperms all the four microspores of tetrad are covered by a layer which is formed by
(a) Pectocellulose
(b) Callose
(c) Cellullose
(d) Sporopollenin
Answer
Answer: (b) Callose
Question 15.
The sexual reproduction in plants was first reported by
(a) Nawaschin
(b) Camererius
(c) Hanstein
(d) Amici
Answer
Answer: (b) Camererius
Fill in the Blanks
Question 1.
Bryophyllum is the best example of propagation by ………………
Answer
Answer: eaf
Question 2.
Fertilization in angiosperms is referred to as ……………… fertilization.
Answer
Answer: double
Question 3.
Inside ovary, ovules develop, form a special tissue called ………………
Answer
Answer: placenta
Question 4.
Aliuminous seeds store reserve food material in ………………
Answer
Answer: endosperm
Question 5.
Each microspore mother cell has ……………… of chromosomes and therefore is ………………
Answer
Answer: 2n, diploid
Question 6.
The ……………… direct the growth of pollen tube towards egg apparatus by secreting some chemical substances.
Answer
Answer: synergids
Question 7.
Stem cuttings are frequently used for ………………
Answer
Answer: vegetative propagation
Question 8.
Mustard and tomato are examples of ……………… flower.
Answer
Answer: hypogynous
Question 9.
Spike with unisexual flowers is called ………………
Answer
Answer: catkin
Question 10.
In Calotropis, all the microspores of anther lobe remain united to form ………………
Answer
Answer: pollenium.
Write True or False
Question 1.
Only meiotic divisions are involved in. asexual reproduction.
Answer
Answer: False
Question 2.
Coriander has compound Unibel type inflorescence.
Answer
Answer: True
Question 3.
Cross-pollination requires abiotic or biotic agent.
Answer
Answer: True
Question 4.
Coleoptile is the sheath covering of plumule.
Answer
Answer: True
Question 5.
Within each ovule a haploid embryo sac usually containing 7 nuclei is formed.
Answer
Answer: False
Question 6.
A population of genetically identical plants derived from an individual is called a seed.
Answer
Answer: False
Question 7.
In Vallisneria the male flowers are released in air.
Answer
Answer: False
Question 8.
Synga my means fusion of gametes.
Answer
Answer: True
Question 9.
In plants, meiosis occurs in pollen grain.
Answer
Answer: False
Question 10.
A clone is a group of individual obtained through vegetative propagation.
Answer
Answer: True
One Word Answers
Question 1.
Name the outer covering of seed.
Answer
Answer: Testa
Question 2.
The female gametophyte of flowering plants that contains an egg cell.
Answer
Answer: Embryosac
Question 3.
Give one example of non-endospermic dicot seed.
Answer
Answer: Pea
Question 4.
The nutritive layer of anther wall which provides nourishment to the developing microspores.
Answer
Answer: Tapetum
Question 5.
Dispersal of fruits and seeds through water is termed as.
Answer
Answer: Hydrochory
Question 6.
Name the sheath covering of plumule.
Answer
Answer: Coleoptile
Question 7.
What is pomalogy?
Answer
Answer: Study of fruits and their cultivation
Question 8.
Name the process of the formation of microspores from microspore mother ceils.
Answer
Answer: Microsporcgenesis
Question 9.
Name a cultivated plant in which neither fruits nor seeds are formed.
Answer
Answer: Sugarcane
Question 10.
The areas on the surface of the pollen where exine is very thin or absent.
Answer
Answer: Aperture
Match the Following
| Column I | Column II |
| A. Parthenocarpy | 1. Tepal |
| B. Tissue culture | 2. Edible banana |
| C. Perianth | 3. Scion |
| D. Grafting | 4. Ground nut |
| E. Non-endospermous seed | 5. Callus |
Answer
Answer:
| Column I | Column II |
| A. Parthenocarpy | 2. Edible banana |
| B. Tissue culture | 5. Callus |
| C. Perianth | 1. Tepal |
| D. Grafting | 3. Scion |
| E. Non-endospermous seed | 4. Ground nut |
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