MCQ on Pollen Grains with Answers Pdf
The pollen grain is a microscopic, non-motile, haploid, unicellular body with a single nucleus. It is also known as microspores. The study of pollen is known as palynology. The pollen grain is produced in the anther of the flower, which is the terminal portion of the stamens. In anther, each microspore mother cell divides meiotically to form a tetrad of haploid microspores (pollen grains) this process is known as microsporogenesis.
The pollen grain is essential for the reproduction of gymnosperms and angiosperms. Pollen is the set of tiny grains produced by the flowers of angiosperms, which are the male reproductive elements or microgametophytes, where the gametes that will fertilize the eggs are found, which will later turn into seeds. Here below we have listed the top 20+ MCQ on Pollen Grains with Answers.
20+ MCQ on Pollen Grains with Answers Pdf
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1. Pollen grains are produced in
(1) Nucellus
(2) Stigma
(3) Anther
(4) Chalaza
Answer: (3) Anther
Explanation: Pollen grains develop inside the anther, which is part of the stamen in flowers.
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2. Pollen grains represent
(1) The future sporophyte
(2) The sporophyte
(3) The gametophyte
(4) The male gametophyte
Answer: (4) The male gametophyte
Explanation: Pollen grains are the male gametophytes that develop from microspores.
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3. The mature pollen grain contains
(1) 3 cells
(2) 7 cells
(3) 2 cells
(4) 1 cell
Answer: (3) 2 cells
Explanation: Mature pollen typically contains a vegetative cell and a generative cell.
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4. The larger cell of a pollen grain with an irregularly shaped nucleus is
(1) Apical cell
(2) Generative cell
(3) Vegetative cell
(4) Basal cell
Answer: (3) Vegetative cell
Explanation: The vegetative cell is larger and responsible for forming the pollen tube.
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5. Transfer of a pollen grain to the stigma of the same plant is called
(1) Antogamy
(2) Geitonogamy
(3) Allogamy
(4) Homogamy
Answer: (2) Geitonogamy
Explanation: Geitonogamy is pollination between different flowers on the same plant.
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6. Which structure is produced by the germination of pollen grain?
(1) Pollen tube
(2) Style
(3) Tube
(4) Vessels
Answer: (1) Pollen tube
Explanation: Pollen germinates to form a pollen tube that transports male gametes.
7. The pollen grains of flowers pollinated by insects are:
(1) Smooth and dry
(2) Rough and sticky
(3) Rough and dry
(4) Large and showy
Answer: (2) Rough and sticky
Explanation: To attach to insects, insect-pollinated pollen is sticky and rough.
8. The minimum number of meiotic divisions required to obtain 100 pollen grains of wheat is
(1) 40
(2) 25
(3) 150
(4) 200
Answer: (2) 25
Explanation: Each meiotic division in one microsporocyte yields 4 pollen grains; 25 × 4 = 100.
9. In dicots the pollen grains possess:
(1) Two germ pores
(2) Three germ pores
(3) Four germ pores
(4) One germ pore
Answer: (2) Three germ pores
Explanation: Tricolpate pollen (three germ pores) is a characteristic feature of dicots.
10. (Skipped number — proceeds to 11)
11. Pollen tube develops from
(1) Generative cell
(2) Male gametes
(3) Vegetative cell
(4) Vegetative nucleus
Answer: (3) Vegetative cell
Explanation: The vegetative cell elongates to form the pollen tube.
12. Longest pollen tube is found in:
(1) Wheat
(2) Maize
(3) Barley
(4) Rice
Answer: (2) Maize
Explanation: Due to the longer style, maize develops the longest pollen tube.
13. In over 60% of angiosperms, pollen grains are shed at:
(1) One-celled stage
(2) Three nuclei stage
(3) Two-celled stage
(4) Three-celled stage
Answer: (3) Two-celled stage
Explanation: Most angiosperms release pollen at the two-celled (vegetative + generative) stage.
14. Pollen grains of many species cause severe allergies & bronchial afflictions in some people often leading to chronic respiratory disorders such as:
(1) Asthma
(2) Bronchitis
(3) Both 1 & 2
(4) Emphysema
Answer: (3) Both 1 & 2
Explanation: Pollen grains can trigger asthma and bronchitis in sensitive individuals.
15. In a pollen grain the small cell is spindle-shaped, with dense cytoplasm:
(1) Vegetative cell
(2) Generative cell
(3) Tube cell
(4) All
Answer: (2) Generative cell
Explanation: The generative cell is small, spindle-shaped, and later divides to form gametes.
16. Pollen grain along with the growing tube has how many haploid nuclei?
(1) One
(2) Two
(3) Three
(4) Four
Answer: (3) Three
Explanation: One vegetative nucleus + two male gametes = 3 haploid nuclei.
17. Sporopollenin in the exine of pollen grain can be degraded by:
(1) High temperature
(2) Low pH (strong acids)
(3) Some enzymes
(4) Can’t be degraded
Answer: (4) Can’t be degraded
Explanation: Sporopollenin is highly resistant and indestructible.
18. Which one of the following statements is wrong?
(1) Pollen grains in some plants remain viable for months.
(2) Intine is made up of cellulose and pectin.
(3) When pollen is shed at two-celled state, double fertilization does not take place.
(4) Vegetative cell is larger than a generative cell.
Answer: (3) When pollen is shed at two-celled state, double fertilization does not take place.
Explanation: Double fertilization occurs regardless of two- or three-celled pollen.
19. What is the function of the germ pore?
(1) Initiation of pollen tube
(2) Release of male gametes
(3) Emergence of the radicle
(4) Absorption of water for seed germination
Answer: (1) Initiation of pollen tube
Explanation: The pollen tube emerges from the germ pore.
20. Which of the following statements is not correct?
(1) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
(2) Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers.
(3) Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
(4) Some reptiles have also been reported as pollinators in some plant species.
Answer: (1) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
Explanation: Only compatible species pollen germinates; this statement is factually incorrect.
21. Which of the following statements is not true?
(1) Tapetum helps in the dehiscence of anther
(2) Exine of pollen grains is made up of sporopollenin
(3) Pollen grains of many species cause severe allergies
(4) Stored pollen in liquid nitrogen can be used in the crop breeding programs
Answer: (1) Tapetum helps in the dehiscence of anther
Explanation: Tapetum nourishes developing pollen, not directly involved in dehiscence.
22. Which one of the following statements is not true?
(1) Pollen grains of some plants cause severe allergies and bronchial afflictions in some people
(2) The flowers pollinated by flies and bats secrete foul odor to attract them
(3) Honey is made by bees by digesting – pollen collected from flowers
(4) Pollen grains are rich in nutrients, and they are used in the form of tablets and syrups
Answer: (3) Honey is made by bees by digesting – pollen collected from flowers
Explanation: Honey is made from nectar, not by digesting pollen.