Get premium membership and access questions with answers, video lessons as well as revision papers.
Protandry and protogyny;
these are mechanisms where either the male or female parts of the reproductive organs ripen
at different times in some flowers; Protandry is a case where stamens ripen earlier; and anthers
release their pollen grains before the stigma is mature; while protogyny refers to a case where
the stigma matures earlier; and hence becomes ready to receive pollen grains before the
anthers are ready/ripe to shed the pollen grains; common in plants of the grass family;
Self-sterility or incompatibility;
is a case where pollen grains cannot germinate on stigma of the same plant;but only germinate
on a different plant of the same species; hindering self-pollination;
Heterostyly;
condition of having different arrangements of style and stigma; for instance flowers could have
shorter stamens than pistils; hence becomes impossible for the pollen to land, germinate and
fertilise the ovules of the same flower; pistils on some flowers could also be shorter than the
stamens therefore other mechanisms that hinder self-pollination are utilized;
Dioecius and monoecius plants;
dioecius plants have reproductive parts located separately on different plants of the same
species; discouraging self-pollination; while monoecius plants have the parts located at
different parts of the same plant body; encouraging cross-pollination;
Kavungya answered the question on May 13, 2021 at 14:08
- Outline five measures that can be employed to prevent and control the spread of the parasite(Solved)
Outline five measures that can be employed to prevent and control the spread of the parasite
Date posted: May 13, 2021. Answers (1)
- Describe the adaptations of Schistosoma spp to their parasitic mode of life(Solved)
Describe the adaptations of Schistosoma spp to their parasitic mode of life
Date posted: May 13, 2021. Answers (1)
- Describe five types of symbiotic relationships in a natural ecosystem(Solved)
Describe five types of symbiotic relationships in a natural ecosystem
Date posted: May 13, 2021. Answers (1)
- Discuss the various ways employed by preys to avoid the predators(Solved)
Discuss the various ways employed by preys to avoid the predators
Date posted: May 13, 2021. Answers (1)
- Discuss how the various tropisms adapt plants to their habitats(Solved)
Discuss how the various tropisms adapt plants to their habitats
Date posted: May 13, 2021. Answers (1)
- Outline the activities that occur in the body when one touches a hot object(Solved)
Outline the activities that occur in the body when one touches a hot object
Date posted: May 13, 2021. Answers (1)
- Explain how bony fish are adapted to their habitats(Solved)
Explain how bony fish are adapted to their habitats
Date posted: May 13, 2021. Answers (1)
- Why is locomotion necessary in higher animals?(Solved)
Why is locomotion necessary in higher animals?
Date posted: May 13, 2021. Answers (1)
- Discuss three examples of natural selection in action(Solved)
Discuss three examples of natural selection in action
Date posted: May 13, 2021. Answers (1)
- How is the mammalian gaseous exchange system adapted to its functions?(Solved)
How is the mammalian gaseous exchange system adapted to its functions?
Date posted: May 13, 2021. Answers (1)
- Describe what happens in a flower from the time of pollination up to the time of seed and fruit development(Solved)
Describe what happens in a flower from the time of pollination up to the time of seed and fruit development
Date posted: May 13, 2021. Answers (1)
- Outline the differences between wind and insect pollinated flowers(Solved)
Outline the differences between wind and insect pollinated flowers
Date posted: May 13, 2021. Answers (1)
- How are xerophytes and hydrophytes adapted to their habitats(Solved)
How are xerophytes and hydrophytes adapted to their habitats
Date posted: May 13, 2021. Answers (1)
- Discuss the causes, effects and control measures for water pollution(Solved)
Discuss the causes, effects and control measures for water pollution
Date posted: May 13, 2021. Answers (1)
- Discuss the various ways in which anaerobic respiration is utilized in industries and homes .(Solved)
Discuss the various ways in which anaerobic respiration is utilized in industries and homes .
Date posted: May 13, 2021. Answers (1)
- Discuss the various mechanisms of opening and closing of stomata(Solved)
Discuss the various mechanisms of opening and closing of stomata
Date posted: May 13, 2021. Answers (1)
- Explain how mammalian bodies regulate glucose and protein levels in their blood(Solved)
Explain how mammalian bodies regulate glucose and protein levels in their blood
Date posted: May 13, 2021. Answers (1)
- Describe the process of urine formation in the mammalian kidneys(Solved)
Describe the process of urine formation in the mammalian kidneys
Date posted: May 13, 2021. Answers (1)
- Describe double circulation in mammals(Solved)
Describe double circulation in mammals
Date posted: May 13, 2021. Answers (1)
- Name any three factors that must be maintained constant in mammalian bodies(Solved)
Name any three factors that must be maintained constant in mammalian bodies
Date posted: May 13, 2021. Answers (1)