1. Explain the fertilization process in plants with neatlabelled diagram.
2. What is the phases of menstrual cycle? Indicate the changes in ovary and
uterus.
3. Natural selection is the driving force for evolution-How?
4. (a) Define astrobiology
(b) Define ethnobotany and write its importance
Answers
Answer:
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Explanation:
Fertilization in plants: In plants, pollination is followed by fertilization. Once the pollen grains are deposited on the stigma, it forms the pollen tube. The pollen tube grow through the ovules and reach the ovary where the egg cell is located.
Each cycle can be divided into three phases based on events in the ovary (ovarian cycle) or in the uterus (uterine cycle). The ovarian cycle consists of the follicular phase, ovulation, and luteal phase whereas the uterine cycle is divided into menstruation, proliferative phase, and secretory phase.
Natural selection, a concept first introduced by British naturalist Charles Darwin in 1859, is a cornerstone of biology that says evolution is driven by organisms passing along beneficial traits that help them survive and reproduce while weeding out unfavorable ones.
Astrobiology, formerly known as exobiology, is an interdisciplinary scientific field concerned with the origins, early evolution, distribution, and future of life in the universe. Astrobiology considers the question of whether extraterrestrial life exists, and if it does, how humans can detect it.[2][3]
Astrobiology makes use of molecular biology, biophysics, biochemistry, chemistry, astronomy, physical cosmology, exoplanetology and geology to investigate the possibility of life on other worlds and help recognize biospheres that might be different from that on Earth.[4] The origin and early evolution of life is an inseparable part of the discipline of astrobiology.[5] Astrobiology concerns itself with interpretation of existing scientific data, and although speculation is entertained to give context, astrobiology concerns itself primarily with hypotheses that fit firmly into existing scientific theories.
Ethnobiology is the scientific study of the way living things are treated or used by different human cultures. It studies the dynamic relationships between people, biota, and environments, from the distant past to the immediate present.[1]
"People-biota-environment" interactions around the world are documented and studied through time, across cultures, and across disciplines in a search for valid, reliable answers to two 'defining' questions: "How and in what ways do human societies use nature, and how and in what ways do human societies view nature?"[2]
Answer:
Explanation:
Fertilisation is the process where egg and zygote fuse to form an embryo
Woman experiences 28 day in menstrual cycle where the egg passes through frimbae the finger like projections
There is a tube which extends from on both sides ie fallopian tubes when the egg notices that the sterm is not coming then it will break
So this continues every month
astrobiology
the branch of biology concerned with the study of life on earth and in space.
Ethnobotany is the study of a region's plants and their practical uses through the traditional knowledge of a local culture and people.