Sexual Reproduction in Flowering Plants Class 12 Biology MCQ With Solutions

 

Q.2. Which of the following holds true regarding dicot embryo?

I. Basal cell produces a single celled suspensor.
II. Terminal cell produces the whole embryo.
III. The first division of terminal cell is generally longitudinal.
IV. Plumule is terminal and less in between the two elongated cotyledons.

(a) II and IV (b) III and IV (c) I and III (d) II and III

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Answer

(b): In dicot embryo, basal cell forms a 6 -10 celled suspensor, terminal cell produces embryo except the radicle. The first division of terminal cell is generally longitudinal. It has two cotyledons. Plumule is terminal and lies in between the two elongated cotyledons.

 

Q.3. When the inner half of the oospore after the first division develops into an embryo and outer half develops into suspensor, then this type of development is called

(a) endosporic (b) endoscopic (c) exosporic (d) exoscopic.

Answer

(b): Endoscopic embryogeny can be defined when the embryo develops from the inner of the two cells that results of the first division of zygote. The outer or the external cells develop the suspension.

 

Q.4. Refer to the given figure and select the incorrect option

(a) W stores food is monocot seed.
(b) X is the rudimentary cotyledon
(c) Y is a foliar structure that encloses leaf primordia
(d) Z is root cap that covers radicle

Answer

(d): The given figure is of mature embryo of monocot. In the given figure, W is scutellum, X is epiblast, Y is coleoptile and Z is coleorrhiza.

 

Q.5. Plant X is pollinated by wind. Which of the following holds true about it?

(a) Platn X only produces cleistogamous flowers.
(b) Plant X could be Calotropis or Amorphophallus
(c) Plant X produces pollen grain in very large numbers.
(d) Flowers of plant X are bright, showy and have a landing platform.

Answer

(c): Plant X is wind pollinated which means that it undergoes cross pollination so it must bear chasmogamous flowers. Cleistogamous flowers remain closed causing self pollination Calotropis and Amorphophallus are insect pollinated plants. Flowers of wind pollinated plants are generally small and inconspicuous.

 

Q.6. Most plants have complete bisexual flowers having both androecium and gynoecium still most of them undergo cross-polination contrivances in different plant species?
(a) In sunflower and Saliva, anthers mature earlier than stigma of the same flower.
(b) In Pansy, stigma less inside a flap while in Kalmia anthers occurs inside corona pocket.
(c) In Mirabilis, the anther and stigma mature at the same time.
(d) Both (a) and (b)

Answer

(d): Mirabilis undergoes self-polination as it shows homogamy i.e., both anther and stigma mature at the same time. The bending of filaments brings the ripe anthers in contact with stigma.

 

Q.7. Choose the incorrect statement.

(a) Autogamy and geitonogamy are not possible in papaya plant.
(b) Date palm can undergo only cross pollination
(c) Self pollination is possible in maize and coconut plant
(d) Geitonogamy and Xenogamy both can occur in cucurbits.

Answer

(c): Papaya and date palm are dioecious plants where male and female flowers are borne on separate plants. Such plants can undergo only cross pollination or xenogamy. Autogamy and geitonogamy is not possible in them. Cucurbit, maize and coconut are monoecious plant where both male and female flowers are borne on the same plant. These plants cannot undergo self pollination but geitonogamy and xenogamy can occur in them.

 

Q.8. The plant parts which consist of two generations-one within the other

(1) pollen grains inside the anther
(2) germinated pollen grain with two male gametes
(3) seed inside the fruit
(4) embryo sac inside the ovule.

(a) (1) only          (b) (1), (2), and (3)
(c) (3) and (4)    (d) (1) and (4)

Answer

(d)

 

Q.9. The given figure show anther and stigma of a plant.

What can be inferred about the plant?
(a) Plant produces edible pollens and nectar
(b) Pollination is highly specific and directions
(c) Plant produces pollen in very large
(d) Plant could be Callistemon or Saliva

Answer

(c): The given figure represents feathery stigmas and versatile anthers of grass. Grass is wind pollinated or anemophilous plant. Anemophily is highly wasteful process as it is non-directional.

 

Q.10. Choose the correct statement.

(a) In apple and grape pollens of another flower germinate more rapidly on the stigma than the pollens of same flower.
(b) In Mirabilis jalapa, stigma mature earlier so that they get pollinated before the anther of the same flower develop pollens.
(c) In mulberry, male and female flowers are borne on separate plants thereby ensuring cross Appollination.
(d) All of these

Answer

(d)

We hope the MCQs for the CBSE Class 12 Biology Chapter 1 on Sexual Reproduction in Flowering Plants are helpful for your board exam preparation.

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