EduNinjaThe drawing shows part of a Thunbergia grandiflora plant. It has been widely cultivated as an ornamental garden plant.
After fertilization, seeds of T. grandiflora form in a small pod. If you were provided with Petri dishes, absorbent cotton balls and seeds, suggest how one variable affecting germination of these seeds could be investigated.
Concerns have been raised about the effect of rising pollution levels on sperm production in men. To investigate the possible effects of pollution on spermatogenesis, sperm samples from men of similar ages were collected in Kolkata in the 1980s and 2000s. The box plot represents the mean and range of sperm counts in the 1980s and 2000s.
The light micrograph shows a cross section of seminiferous tubules.
Identify the type of cell labelled Z .
Hemophilia is a sex-linked disease that affected some members of royal families in Europe during the 19th and 20th centuries.
Explain the mechanism that prevents polyspermy during fertilization.
Which diagram(s) represent(s) processes used in asexual reproduction?
I only
I and II only
II only
I, II and III
The micrograph shows a cross section of a lily (Lilium longiflorum) anther.
What can be found in X ?
Haploid nuclei produced by meiosis
Diploid nuclei produced by fertilization
Haploid nuclei produced by mitosis
Diploid nuclei produced by pollination
What term describes genetically identical organisms derived from a single parent?
Species
Clone
Family
Twins
A broad bean is the seed of a species, Vicia faba, in the Fabaceae, a family of flowering plants. This family contains many species that are used as sources of food.
On the diagram, label the testa and the radicle.
An experiment was done to test the hypothesis that temperature affects the rate of germination of the broad bean. Outline two factors apart from temperature that should be controlled in this experiment.
A cloning method used for livestock involves in vitro fertilization (IVF) with selected male and female gametes. The diagram shows the steps followed after in vitro fertilization.
What does X represent?
A group of eggs
An embryo
A follicle
A group of zygotes
The drawing shows a flower of red valerian, Centranthus ruber.
State the name and function of structures I and II.
Structure I name and function:
Structure II name and function:
Structure III is the ovary. Outline the processes that occur in the ovary.
Structure IV contains a gland that secretes a sugary liquid. Suggest a benefit to the plant of secreting this liquid.
The image shows a cell in the anther of a lily (Lilium sp.) plant during the first division of meiosis.
State where in the lily flower pollen would be formed.
Distinguish between plant pollination and fertilization.
The diagram shows a cross section through a broad bean (Vicia faba) seed.
On the diagram, label the cotyledon.
Outline the function of the cotyledon.