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Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS
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Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS
A viable seed excavated from the Arctic Tundra that successfully germinated and flowered after an estimated record of \( 10{,}000 \) years of dormancy belongs to which of the following species?
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Match the items in List-I with their corresponding examples or definitions in List-II: Choose the correct answer from the options given below: List-I List-II A. Perisperm I. Castor and Coconut B. Albuminous seed II. Black pepper and Beet C. Ex-albuminous seed III. Apple and Strawberry D. False fruit IV. Pea and Groundnut
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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): Tapetal cells generally possess dense cytoplasm and frequently become multinucleate. Reason (R): Tapetal cells undergo repeated endomitosis and free-nuclear division without cytokinesis during their development. In the light of the above statements, choose the most appropriate answer:
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Which of the following correctly represents the morphological nature of coconut water from tender coconut and its surrounding white kernel, respectively?
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Observe the transverse section of the microsporangium showing wall layers. Identify the innermost layer that provides nourishment to the developing pollen grains.
Read answer →Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS
In the given diagram showing the longitudinal section of an embryo of grass, what is the single cotyledon situated towards one side (lateral) of the embryonal axis called?
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Which of the following represents an evolutionary advantage of seeds in angiosperms? (a) Being products of sexual reproduction, they generate new genetic combinations leading to variations. (b) Since pollination and fertilisation are independent of water, seed formation is more dependable. (c) Dehydration and dormancy allow seeds to be stored for agricultural use throughout the year. (d) They possess sufficient food reserves to nourish young seedlings until they become photosynthetic. Choose the correct option:
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Match List-I with List-II: List-I (Anther Wall Layer) A. Epidermis B. Endothecium C. Middle layers D. Tapetum List-II (Feature / Function) I. Innermost layer, nourishes developing pollen grains II. Outermost protective single cell layer III. Helps in dehiscence and protection, beneath epidermis IV. 1-3 layered intermediate protective wall Choose the correct answer from the options given below:
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Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:
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Which of the following statements is INCORRECT regarding parthenocarpy?
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Cryopreservation of pollen grains for years in pollen banks for crop breeding programmes is carried out at which temperature?
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Consider the following statements regarding seed maturation and physiology: Statement I: As the seed matures, its water content is reduced to about \( 10\text{--}15\% \) moisture by mass, and the general metabolic activity of the embryo slows down. Statement II: The micropyle completely seals off upon maturation to prevent any exchange of gases and water. Choose the correct option:
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In some apomictic species, the diploid embryo develops without fertilisation because:
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Select the correct combination of plants having a single ovule per ovary versus many ovules per ovary:
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In a typical dicotyledonous embryo, the cylindrical portion of the embryonal axis below the level of cotyledons is called:
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Identify the labels A, B, C, and D in the given diagrammatic representation of a transverse section of an anther wall:
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Examine the stages of a microspore maturing into a pollen grain shown in the figure. What type of spindle is formed during the division that produces the vegetative and generative cells?
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Which of the following statements is INCORRECT regarding the tapetum?
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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): Cleistogamous flowers invariably produce an assured seed-set even in the absence of pollinators. Reason (R): Cleistogamous flowers never open, and their anthers and stigma lie close to each other, preventing cross-pollination. In the light of the above statements, choose the most appropriate answer from the options given below:
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In which of the following families do pollen grains retain their viability for several months after being shed?
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The given diagram illustrates a mature dehisced anther. Which of the following events directly leads to the liberation of pollen grains as seen in the figure?
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Identify the incorrect statement from the following options:
Read answer →Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS
