Flower structure, male and female gametophytes
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See all →- How many meiotic and mitotic divisions need to occur for the development of a mature female gametophyte from the megaspore mother cell in an angiosperm plant? Answer: 3. 1 Meiosis and 3 Mitosis Key idea: Count divisions from megaspore mother cell (MMC) to the 7-celled, 8-nucleate embryo sac. MMC un... 1
- Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.Reason (R) : Presence of more than one nuc… Answer: 1. Both A and R are true and R is the correct explanation of A Key idea: The tapetum is the innermost wall layer of the anther and n... 1
- Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : A typical unfertilised, angiosperm embryo sac at maturity is 8 nucleate and 7-celled.Reason (R) : The egg apparatus has 2 polar… Answer: 3. A is true but R is false Key idea: The mature embryo sac is 7-celled and 8-nucleate, so A is true. The reason is false: the egg a... 1
- Identify the correct description about the given figure: Answer: 2. Wind pollinated plant inflorescence showing flowers with well exposed stamens. Key idea: a dense spike with many long, well-expos... 1
- A typical angiosperm embryo sac at maturity is : Answer: 1. 8-nucleate and 7-celled A typical (Polygonum-type) embryo sac forms from the megaspore by three mitotic divisions, giving 8 nucle... 1
- The body of the ovule is fused within the funicle at : Answer: 1. Hilum The ovule is attached to the funicle (stalk) at the hilum, where the body of the ovule fuses with the funicle. The micropyl... 1