Every question from past board papers on Reproduction, newest paper first. Open any question for its full worked answer.
Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Both wind and water pollinated flowers are not very colourful and do not produce nectar.
Reason (R) : The flowers produce enormous amount of pollen grains in wind and water pollinated flowers.
In the light of the above statements, choose the correct answer from the options given below :
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 nuclei.
In the light of the above statements, choose the correct answer from the options given below :
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 nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells.
In light of the above statements, choose the most appropriate answer from the options given below :
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?
Identify the set of correct statements:
A. The flowers of Vallisneria are colourful and produce nectar.
B. The flowers of waterlily are not pollinated by water.
C. In most of water-pollinated species, the pollen grains are protected from wetting.
D. Pollen grains of some hydrophytes are long and ribbon like.
E. In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below:
Identify the correct description about the given figure:
What is the function of tassels in the corn cob?
In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are :
Large, colourful, fragrant flowers with nectar are seen in :
Identify the incorrect statement related to Pollination :
Given below are two statements :
Statement I :
Cleistogamous flowers are invariably autogamous
Statement II :
Cleistogamy is disadvantageous as there is no chance for cross pollination
In the light of the above statements, choose the correct answer from the options given below :
A typical angiosperm embryo sac at maturity is :
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :
In some members of which of the following pairs of families, pollen grains retain their viability for months after release ?
The plant parts which consist of two generations - one within the other :
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
In water hyacinth and water lily, pollination takes place by :
The body of the ovule is fused within the funicle at :
Which one of the following statements regarding post-fertilization development in flowering plants is incorrect ?
In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as :
Persistent nucellus in the seed is known as :
What is the fate of the male gametes discharged in the synergid ?
Offsets are produced by
Which of the following flowers only once in its life-time ?
Which of the following has proved helpful in preserving pollen as fossils ?
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
Double fertilization is
Double fertilization is exhibited by :
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by :
A dioecious flowering plant prevents both :
Attractants and rewards are required for :
Functional megaspore in an angiosperm develops into :
The coconut water from tender coconut represents :
Which one of the following statements is not true ?
Seed formation without fertilization in flowering plants involves the process of :
Which of the following statements is not correct ?
Which one of the following statements is not correct?
Which one of the following generates new genetic combinations leading to variation?
In majority of angiosperms
Pollination in water hyacinth and water lily is brought about by the agency of
The ovule of an angiosperm is technically equivalent to
