Exam 38: Angiosperm Reproduction and Biotechnology

Before ploughing a paddock, a farmer thought the bare paddock looked weed-free. Three days after ploughing and turning over the soil, he was amazed to see thousands of tiny seedlings. What is the most likely reason for the mass germination of seeds?

Which of the following is a scientific concern related to creating genetically modified crops?

The generative cell of male angiosperm gametophytes is haploid. This cell divides to produce two haploid sperm cells. What type of cell division does the generative cell undergo to produce these sperm cells?

Plants produce more seeds when they reproduce asexually than sexually. Yet most plants reproduce sexually in nature. What is the probable explanation for the prevalence of sexual reproduction? Sexual reproduction ________.

Pineapple is a ________ fruit.

The vast number and variety of flower species is probably related to various kinds of ________.

Which of the following types of plants are incapable of self-pollination?

Which of the following is a potential advantage of introducing apomixis into hybrid crop species?

Which of these activities is part of the development of crop plants from wild relatives? I. people planting seeds of the plants with the characteristic wanted II. people making observations of desired plant characteristics III. people eating products from only the plants with desired characteristics IV. people developing several varieties of crops from a wild relative

Pollen from a plant with the S1S2 genotype is recognised and allowed to germinate on the stigma of the same plant with the S1S2 genotype. According to this, the plant is ________.

During the alternation of generations in plants, ________.

The most immediate potential benefits of introducing genetically modified crops include ________. I. creating crops that can grow on land previously unsuitable for agriculture II. creating crops with better potential for biofuel production III. creating crops with better nutritional attributes IV. increasing crop yield V. decreasing the mutation rate of certain genes

In order for an ovule (egg cell) in a flower to be fertilised and form a viable seed, pollination must occur. In this process, a sperm cell is delivered to the ovule when the pollen grain lands on the stigma and grows a tube, which enters the ovary and discharges the sperm cell to form a diploid zygote when it fuses with the egg cell. Although it only takes one pollen grain to successfully deliver sperm to the egg, numerous pollen grains are generally transferred to the stigma during insect pollination of flowering plants. Which phenotypic traits of pollen would you predict to be selected upon to promote survival and fitness within an insect-pollinated flowering plant?

Many flowering plants coevolve with specific pollinators. The Madagascar orchid has a 12-inch floral tube and is a reliable nectar source for the hawkmoth, which has a correspondingly long proboscis (tongue). Which statement most accurately describes how coevolution might have occurred for the hawkmoth and Madagascar orchid?

Which of the following flower parts develops into a seed?

Which of the following statements regarding flowering plants is correct?

Which of the following is an effective method to produce plants exhibiting hybrid vigour?

Suppose that 100 pollen grains land on a stigma, and 50 mature seeds are formed in the fruit. What does this indicate about the pollination process and success?

Which statement concerning grafting is correct?

Cottonwood, aspen, and willow trees have beige flowers, with no petals, that appear before the tree's leaves are out in the spring; and they are dioecious. What does this indicate about these trees?