In the nervous system, a synapse is a structure that permits a neuron (or nerve cell) to pass an electrical or chemical signal to another neuron. The minute space between the cell membrane of an axon terminal and of the target cell with which it synapses.
Q2. Which organ has finger like outgrowths which are called as Villi (Singular Villus)?
कौन से अंग पर ऊँगली क समान उभरी हुई संरचनाएं होती हैं, जिन्हें दीर्घ रोम तथा रसांकुर कहते हैं?
Villi are specialised for absorption in the small intestine as they have a thin wall, one cell thick, which enables a shorter diffusion path. They have a large surface area so there will be more efficient absorption of fatty acids and glycerol into the blood stream.
Q3. Which of the following is not a vector quantity?
All except electric current are vector quantities. It may seem that current is a vector because it have a magnitude and a direction. But the thing is, a vector always obey the law of addition of vectors. Since current doesn’t obey it and it follows algebraic addition, current is a scalar.
Q4. Which of the following carries oxygen to various parts of human body?
निम्नलिखित में से कौन सा मानव शरीर के विभिन्न अंगों का ऑक्सीजन वाहक है?
Red blood cells (RBCs), also called erythrocytes, are the most common type of blood cell and the vertebrate’s principal means of delivering oxygen(O2) to the body tissues—via blood flow through the circulatory system. RBCs take up oxygen in the lungs, or gills of fish, and release it into tissues while squeezing through the body’s capillaries. The cytoplasm of erythrocytes is rich in hemoglobin, which is the main oxygen delivering unit, is an iron-containing biomolecule that can bind oxygen and is responsible for the red color of the cells.
Q5. Which of the following function is performed by the kidneys in the human body?
मानव शरीर के गुर्दे इनमे से कौन सा कार्य करते हैं?
The Excretory system is responsible for the elimination of wastes produced by homeostasis.
There are several parts of the body that are involved in this process, such as sweat glands, the liver, the lungs and the kidney system. Nephrons which are present in the kidneys are the basic filtering units.
Q6. The bending of light when it passes around a corner or a slit is due to ______.
जब प्रकाश किसी किनारे या किसी दरार से गुजरती है, तो ________की वजह से वंकित हो जाति है |
(a) reflection/ प्रतिविम्ब
(b) refraction/ अपवर्तन
(c) diffraction/ विवर्तन
(d) total internal reflection/ पूर्ण आतंरिक प्रतिविम्ब
Diffraction is the slight bending of light as it passes around the edge of an object. The amount of bending depends on the relative size of the wavelength of light to the size of the opening. If the opening is much larger than the light’s wavelength, the bending will be almost unnoticeable.
Q7. Through photosynthesis at least a half of the total carbon dioxide fixation on earth is carried out by?
प्रकाश संश्लेषण के माध्यम से कुल स्थारिकृत कार्बन डाइऑक्साइड का लगभग आधा भाग पृथ्वी पर कोण स्थारिकृत करता है?
An arthropod is an invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Euarthropoda, which includes insects, arachnids, myriapods, and crustaceans. Arthropods are characterized by their jointed limbs and cuticle made of chitin, often mineralised with calcium carbonate. The arthropod body plan consists of segments, each with a pair of appendages
Q9. If an object moves in a circular path with uniform ________, its motion is called uniform circular motion.
अगर कोई वस्तु वृतीय पथ पर एक समान______से चलती है तो उसकी गति को एकसमान वृतीय गति कहा जाता है |
Amphibians are those organisms which live on both land and in water. Bryophytes are called amphibians of the plant kingdom because these plants though live in soil but they need water for sexual reproduction. The sperm of bryophyte(antherozoids) are flagellate and need water to swim to the eggs.
Q11. Animals belonging to phylum _____________ are fundamentally characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits.
________संघ के प्राणियों में तीन मूलभूत लक्षण – पृष्ठ, रज्जू, पृष्ठ खोखली तंत्रिका-रज्जु तथा युग्मित ग्रसनी क्लोम छिद्र पाए जाते हैं |
A chordate is an animal belonging to the phylum Chordata; they possess a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail, for at least some period of their life cycle.
Q12. A ball rolling along the ground gradually slows down and finally comes to rest is due to ________.
________के कारण फर्श पर लुढ़कने वाली गेंद धीरे-धीरे धीमी हो जाति है और अंत में रुक जाति है |