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Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS
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Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS
Read the following statements about pollination by water: Statement I: Pollination by water is quite common in flowering plants and occurs in over 200 genera of both dicots and monocots. Statement II: The distribution of some bryophytes and pteridophytes is limited because of the requirement of water for transport of male gametes and fertilisation. Choose the correct option:
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In the given three-dimensional cut section of an anther, which structure is responsible for the release of pollen grains upon maturity?
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In angiosperms, what is the primary biological significance of the delay in zygote division until a certain amount of endosperm has developed?
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Examine the provided diagram showing false fruits. In the transverse section of an apple (b), which labeled floral part forms the major edible fleshy part?
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Given below are two statements: Statement I: The cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads. Statement II: Each cell of the sporogenous tissue is a potential pollen or microspore mother cell. In the light of the above statements, choose the correct answer:
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Filiform apparatus is a characteristic cellular thickening found at the micropylar tip of:
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Consider the following statements regarding pollen grains: (a) The hard outer layer called exine is made up of sporopollenin. (b) Sporopollenin is readily degraded by strong acids and alkali. (c) Germ pores are apertures on the exine where sporopollenin is absent. (d) The inner wall called intine is a thin and continuous layer made up of cellulose and pectin. Which of the above statements are correct?
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If an anther of a diploid plant (\( 2n = 24 \)) has 30 sporogenous cells in each of its four microsporangia, what will be the total number of pollen grains produced and the chromosome number in each vegetative cell?
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How many meiotic divisions and how many pollen mother cells (PMCs) are required to produce 200 pollen grains in a typical angiosperm?
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Which of the following groups contains plants whose fruits typically contain thousands of tiny seeds?
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In the diagram of a typical anatropous ovule shown below, identify the basal part of the ovule located opposite to the micropyle:
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In fruits such as apple, strawberry, and cashew, which of the following floral parts contributes along with the ovary to fruit formation, categorising them as 'false fruits'?
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Consider the following statements regarding microsporogenesis: Statement I: As the anther develops, the cells of the sporogenous tissue undergo mitotic divisions to form microspore tetrads. Statement II: Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad and acts as a potential pollen mother cell. Choose the correct answer:
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Read the following statements regarding the female gametophyte development in angiosperms: Statement I: The mitotic divisions during embryo sac development are strictly free nuclear and are not immediately followed by cell wall formation. Statement II: In monosporic development, the functional megaspore at the micropylar end develops into the embryo sac while the three at the chalazal end degenerate. In the light of the above statements, choose the correct answer from the options given below:
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How many mitotic divisions are strictly required for the nucleus of a functional megaspore to develop into a mature 8-nucleate female gametophyte?
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The pollen tube can easily emerge from the pollen grain despite the presence of extremely hard sporopollenin in the exine. Reason (R): Prominent apertures called germ pores are present on the exine where sporopollenin is completely absent. In the light of the above statements, choose the correct answer:
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The inner wall layer of the pollen grain, the intine, is:
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The given figure represents different types of gynoecium in angiosperms. Identify the plants corresponding to (b) and (c) respectively:
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Pollen grains can be well preserved as microfossils for millions of years. Reason (R): Sporopollenin present in the exine of pollen grains is highly resistant to strong acids, alkali, high temperatures, and known enzymes. In the light of the above statements, choose the correct answer:
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The microspores formed through microsporogenesis are initially held together in a cluster of four cells called microspore tetrad. Reason (R): As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains. In the light of the above statements, choose the correct answer:
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Which of the following represents the correct sequence of microsporangial wall layers from the exterior to the interior?
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Given below are two statements: Assertion (A): Apple, strawberry, and cashew are categorized as false fruits. Reason (R): In these species, floral parts like the thalamus also contribute to fruit formation along with the ovary. Choose the correct option:
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