What are the external factors on seedling growth? and what are their effects in seed growth and germination? (The seeds used in the experiment are monggo seeds)
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What are the external factors on seedling growth? and what are their effects in seed growth and germination?
(The seeds used in the experiment are monggo seeds)
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- Given below is an experimental setup to demonstrate a particular tropic movement in germinating seeds. Study the diagram and answer the questions that follow Perforated trough Moist sawdust - Germinating seed -Brick (i) Label the parts 1 and 2. (ii) Name the tropic movement shown by part 1. (iii) Part 1 is affected by two stimuli. Name them. Which one of the two is stronger? (iv) What is Thigmotropism ? Give one example. (v) What is meant by 'Positive' and 'Negative' tropic movements in plants?Four of the following are steps occur in the earliest stages of seed germination. Choose the fifth and last step: Select one: O a. Intake of water b. Activation of the aleurone layer O c. Cell division d. Increase in cellular respiration e. Mobilization of food reserves for cell divisionIn the heart embryo stage of Arabidopsis thaliana, there are three key anatomical features that are essential for plant development. The red highlighted cells will become the the yellow highlighted cells will become the and the two "lobes" of the heart will become the suspensor; apical meristem; seed coat basal daughter cell; apical daughter cell; cotyledons shoot apical meristem; root apical meristem; taproots suspensor; shoot apical meristem; taproots root apical meristem; shoot apical meristem; cotyledons
- In a common eudicot pattern of development for the common bean in the figure, the radicle emerges from the seed (1), then begins to develop into a primary root that grows down into the soil. As this occurs, the hypocotyl emerges from the seed and bends into the shape of a hook (2). The bent hypocotyl lengthens and pulls the cotyledons upward (3). When the hypocotyl reaches the soil surface, exposure to light causes it to straighten (4). Primary leaves emerge from between the cotyledons and begin photosynthesis. The cotyledons typically undergo a period of photosynthesis before shriveling (5). Eventually, the cotyledons fall off the lengthening stem, and the young plant’s new leaves produce all of its food. a) Identify and explain what environmental factors influence the timing and coordination of the germination of seeds.What is the water content of matured seed and what is the reason behind for the low water content? *Describe three mechanisms whereby seed dormancy is broken in different types of seeds. How are these mechanisms related to the typical environment of the plant?
- How does the order of red and far-redillumination affect seed germination?What are the advantages and disadvantages of self and cross pollination? How are the structures of the pistil and stamen adapted for successful fertilization?Answer the following question: Does the pod of mung beans and garden peas appear to be a single carpel with one cavity containing seeds? Is the micropyle near the attachment of the seed to the pod of mung beans and garden peas?
- The three main parts of a typical mature eudicot seed are the _______ . a. pollen grain, egg, and seed coat b. embryo, endosperm, and seed coat c. megaspores, microspores, and ovule d. embryo, cotyledons, and seed coatSuppose 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? A) 100% success: 100 pollen grains grew to 50 ovules, two to each, and double fertilization occurred. B) 100% success: Only 50% of the pollen grains germinated, but each produced 2 sperms to complete double fertilization in 50 seeds. C) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 50 polar nuclei. D) 50% success: 50 sperm fertilized 50 eggs, and 50 sperm fused with 100 polar nuclei. correct answer and explanation why please.Tobacco plants invest a lot of resources into the production of secondary compounds know as alkaloids (e.g., nicotine) that we believe act as defenses against herbivores. The researchers did an experiment where they added a hormone that reduces the production of alkaloids. In graph (a), the data show that the hormone reduced the proportion of alkaloids as a function of leaf mass relative to controls- so the hormone worked. They also measured the lifetime seed production of the plants in both treatments without any herbivores present (b). They had the following results. What might you conclude/hypothesize/investigate based on the data in graph (b) (a) Chemical defenses (percent of leaf mass) 1.8% 1.4 1.0 0.6 0.2 No hormone added Hormone added (b) Lifetime seed mass (g/plant) -18 14 10 No hormone added Hormone added It would be good to test whether the hormone is very specific or whether it might also cause changes in other metabolic processes The hormone has no effect on the lifetime…