Sexual Reproduction In Flowering Plants Mock Tests

22 questions available

Sexual Reproduction In Flowering Plants Mock Test 1

Questions: 22

Sample Questions

Class 12 Biology

In oranges, multiple embryos are sometimes observed in a single seed. This phenomenon is due to:

A Adventitious embryony — diploid nucellar cells surrounding the embryo sac divide and form additional embryos

B Polyspermy — multiple sperm cells fertilising the egg

C Multiple ovulation followed by fertilisation of each egg

D Parthenogenesis — development of an unfertilised egg into an embryo

Class 12 Biology

Polyembryony refers to the presence of:

A Multiple pollinators visiting the same flower

B More than one embryo within a single seed

C Multiple ovules in a single ovary

D Multiple flowers on one inflorescence

Class 12 Biology

In the development of a dicotyledonous embryo, the globular stage is immediately preceded by the:

A Proembryo stage

B Heart-shaped stage

C Torpedo stage

D Mature seed stage

Class 12 Biology

Self-incompatibility in flowering plants is a mechanism that primarily prevents:

A Self-fertilization by blocking pollen germination or pollen tube growth on the same flower or plant

B Cross-pollination by other insects or wind vectors

C Fertilization between species with different chromosome numbers

D Polyembryony from multiple pollen grains entering the same ovule

Class 12 Biology

If the stigma of a flower is incompatible with the arriving pollen grains, the pollen tube growth will be prevented by:

A Degeneration of the pollen grain before germination

B Chemical rejection at the stigma surface preventing pollen tube elongation

C Mechanical blockage by the stigmatic papillae

D Immediate death of the pollen tube after it enters the stigma

Class 12 Biology

The innermost layer of the anther wall which is metabolically active and helps in the nourishment of the developing pollen grains is:

A Endotecium

B Middle layer

C Tapetum

D Exotecium

Class 12 Biology

Vegetative propagation in plants like Agave and Opuntia occurs primarily through:

A Runners and stolons

B Bulbils

C Offset

D Underground stems (rhizomes) and bulbils

Class 12 Biology

In a typical angiosperm anther, the tapetum is responsible for:

A Performing meiosis to produce microspores

B Providing nutrition to developing pollen grains

C Forming the outermost protective layer

D Determining the time of pollen release

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