Ans.
Protein synthesis involves two stages, named as transcription and translation. During transcription, information present in DNA molecule is used to make mRNA molecule, while translation involves formation of polypeptide chain or protein by using information present in mRNA in the form of codons.
Prokaryotic organisms lake true nuclei, hence in these organisms both transcription and translation take place in cytosol. In eukaryotic organisms, transcription takes place in nucleus, while translation takes place in ribosomes, present in the cytosol.
Here's an answer to the first question:
Day 1:
Today, I was born on the anther of a beautiful orange flower. The anther is the part of the stamen that produces pollen grains like me. I am very tiny and round, and I have a hard coat to protect me from drying out. I have a lot of brothers and sisters, and we all live together on the anther. We are waiting for a pollinator to come and pick us up.
Day 2:
Today, a pollinator came to visit our flower. It was a big and fuzzy bee, and it landed on the anther. It started to collect some of us with its legs and mouthparts, and put us in a special pouch on its abdomen. It was very exciting, but also scary. I wondered where it would take us. The bee flew away from our flower, and headed towards another flower.
Day 3:
Today, the bee landed on another flower. It was a purple flower, with a green stem and leaves. It looked very different from our orange flower, but it was also very pretty. The bee started to rub some of us off its pouch onto the stigma of the purple flower. The stigma is the part of the pistil that receives pollen grains like me. I was one of the lucky ones who landed on the stigma. I felt a sticky substance that helped me stick to it.
Day 4:
Today, I started to grow a tube from my coat. This is called the pollen tube, and it is how I can reach the ovary of the purple flower. The ovary is the part of the pistil that contains eggs. I have to fertilize one of these eggs, so that a new seed can be formed. The pollen tube grows through the stigma and down the style, which is the stalk that connects the stigma and the ovary.
Day 5:
Today, I reached the ovary of the purple flower. It was dark and moist inside, and I saw many eggs waiting for me. I chose one of them, and entered it with my tube. This is called fertilization, and it is when a pollen grain like me combines with an egg to form a zygote. The zygote is the first cell of a new plant. I felt very happy and proud, because I had completed my journey.
Day 6:
Today, I am no longer a pollen grain. I am part of a new plant, that will grow from the seed that was formed by me and the egg. The seed will develop inside the ovary, which will become a fruit. The fruit will protect the seed until it is ready to germinate and grow into a new plant. The new plant will have some traits from me and some traits from the egg, because we are from different flowers of the same species. This is called cross-pollination, and it is how plants can create genetic diversity.
Here's the answer to the second question:
The sepal is the green part at the base of the flower that protects the bud before it opens. I labeled it with the letter A.
The petal is the colorful part of the flower that attracts pollinators. I labeled it with the letter B.
The pistil is the female part of the flower that consists of the stigma, style, and ovary. I labeled it with the letter C and the symbol ♀️.
The stamen is the male part of the flower that consists of the anther and filament. I labeled it with the letter D and the symbol ♂️.
The pollen is the yellow dust-like substance that is produced by the anther and carries the male genetic material. I labeled it with the letter E.
The ovary is the part of the pistil that contains the eggs or ovules. I labeled it with the letter F.
The eggs are the female reproductive cells that are fertilized by pollen to form seeds. I labeled them with the letter G.
Explanation:
- Leaf: The leaf is a flat, green part of the flower that usually grows on the stem or branch. It helps the plant make food through a process called photosynthesis.
- Blade: The blade is the broad and flattened part of the leaf. It is the main area where photosynthesis takes place.
- Midrib: The midrib is the central vein or rib of the leaf. It provides support and helps in transporting water and nutrients to the leaf.
- Petiole: The petiole is the stalk that connects the leaf to the stem. It provides support and allows the leaf to get water and nutrients from the stem.
- Root: The root is the part of the plant that grows underground and anchors the plant in the soil. It also absorbs water and nutrients from the soil.
- Stem: The stem is the main structural support of the plant. It holds up the leaves, flowers, and fruits, and also transports water, nutrients, and sugars between the roots and the rest of the plant.
- Terminal bud: The terminal bud is a bud located at the tip of the stem. It contains developing leaves, flowers, or shoots.
- Lateral bud: The lateral bud is a bud located on the sides of the stem. It can develop into branches, leaves, or flowers.
- Flower: The flower is the reproductive part of the plant. It usually has colorful petals and produces pollen and nectar to attract pollinators like bees or butterflies.
I hope this helps! Let me know if you have any other questions.
The lion eats the grass
Carbon from grass doesn't end up in a lion.
The carbon ends up in the lion's food chain.
The lion breathes in carbon given out by the plant
Answer:
The carbon ends up in the lion's food chain
Explanation:
Lions just like humans, depends on oxygen to breathe therefore it is not the last option. Lions also don't eat plants, they are carnivores. Members in a food chain are all connected, the only logical answer would be C
Africa and Asia
Europe and Africa
Europe, Africa, and Asia
The Homo ergaster occupy Africa 1.6 million years ago. Therefore, option A is correct.
The oldest early humans known to have had proportions similar to modern humans, with relatively long legs and shorter arms compared to the size of the torso, are the early African Homo erectus fossils (also known as Homo ergaster).
At the onset of the lower Pleistocene and the lowering of the environment, Homo ergaster, sometimes known as the "working man," is an extinct species of hominid (or subspecies, according to some authorities) that existed throughout eastern and southern Africa between 1.9 and 1.4 million years ago.
Thus, the Homo ergaster occupy Africa 1.6 million years ago. Therefore, option A is correct.
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Oxygen Cycle. Hope this helps
Minerals have the property of cleavage to split into different parts, particular colors to particular minerals, and magnetism due to presence of electrons. Thus, the correct option is D.
Minerals are the elements which are found in the Earth crust and in foods that our body need to undergo development and function. Some of the essential minerals for health of a living organism include calcium, phosphorus, potassium, sodium, chloride, copper, iodine, etc.
Minerals show the property of cleavage, through this large pieces of minerals breaks into smaller ones which can be further used in different processes.
Different minerals have different colors which can be changed due to environmental conditions and reactions.
Minerals show magnetism. It is property responsible for the magnetic behavior of minerals due to presence of electrons in the valence shells.
Therefore, the correct option is D.
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