B10.1-2. Asexual reproduction & Sexual reproduction in plants

(0654) Coordinated Science

 

Subheadings and key concepts covered

B10.1. Asexual & sexual reproduction: 

• virus (binary fission), plants (runners, bulbs, tubers)
• haploid cells, diploid cells, zygote
• advantages and disadvantages of either mode of reproduction

B10.2. Sexual reproduction in plants

• flower anatomy: sepal, petal, stamen, carpel
• pollination: wind and insect-pollinated plants; their adaptations
• fertilisation
• investigating conditions for germination: water, oxygen, warmth

12. Reproduction pdf

#125 Summary of Reproduction

Reproduction is the biological process by which new "offspring" individual organisms are produced from their "parents". It is a fundamental feature of all known life.

Two types of reproduction: sexual and asexual.

#112 Growth and development

Growth - permanent increase in size and dry mass, by an increase in cell number or cell size or both.

Development - increase in complexity 

#111 Self-pollination and cross-pollination

Credit: TutorVista

Self-pollination - transfer of pollen from the anther to the stigma of the same flower, or to another flower of the same plant.

Cross-pollination - transfer of pollen from the anther of a flower to the stigma of a flower on a different plant of the same species.

#110 Seed dispersal

Nutmeg is dispersed by birds.
Photo credit: russolab.unl.edu

The flowers produce seeds which can be dispersed by the wind or other animals, providing a means of colonising new areas.

#109 Formation of seed, conditions affecting germination

The fertilised ovule divides by mitosis to form a seed containing the embryo plant and food stores called cotyledons.

#108 Structure and functions of a flower

You need to be able to describe the structure and functions of a named dicotyledonous (two seed leaves) flower.

#107 Reproduction in plants - agents of pollination

Reproduction in flowering plants may occur both sexually or asexually.

Pollination can take place with the help of agents: wind or insects.