Biology
A: Very short answer type questions:-
1. The xylem in plants are responsible for
2. The filtration units of kidneys are called
3. A sexual reproduction takes place through budding in
4. What is the significance of emulsion of fat?
5. Describe double circulation in human beings.
6. List any two modes of asexual reproduction with an examp
Answers
ANS.1) Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to stems and leaves, but it also transports nutrients.
ANS.2)The artery then branches so blood can get to the nephrons (pronounced: NEH-fronz) — 1 million tiny filtering units in each kidney that remove the harmful substances from the blood. Each of the nephrons contain a filter called the glomerulus (pronounced: gluh-MER-yuh-lus).
ANS.3)Saccharomyces cerevisiae commonly known as yeast, reproduces both asexually as well as sexually. Yeast reproduce asexually through a process known as budding.
ANS.4)Bile salts help in the breakdown of oil droplets into small globules forming a milky emulsion. This process is called emulsification. This process facilitates further digestion of fats.
ANS.5)The human circulatory system has three key components: blood vessels, blood and the heart. It is called a double circulatory system because blood passes through the heart twice per circuit. The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns back to the heart.
ANS.6)Few asexual methods are budding (e.g. Hydra), binary fission (e.g. Amoeba, bacteria), spore formation (e.g. ferns), fragmentation (e.g. Planaria), and vegetative propagation (e.g. Onion).