A: The cartilaginous flap present over glottis preventing food from entering into larynx is called epiglottis.
Q: Why mitochondria are called as power houses of the cell? (one mark)
A: Mitochondria help in producing the energy or ATP. So, they are called the power houses of the cell.
Two Marks Questions
Q: What is reaction centre?
A: Chlorophyll and other accessory pigment molecules are situated in the thylakoid
membranes and organized to form reaction centres called photosystem I and photosystem
II. Highly reactive special forms of chlorophyll-a called p700 and p680 are present in PS I and PS II respectively.
P700 and p680 constitute the reaction centres.
Q: What is the difference between photophosphorylation and oxidative phosphorylation?
A: In Photosynthesis, ADP is changed to ATP by using the light energy. This is called (photosynthesis) photophosphorylation.
In respiration, ADP is changed to ATP by oxidation of glucose. This is called oxidative
phosphorylation.
Q: Write a short note on double circuit circulation system?
A: The heart that pumps blood to lungs for oxygenation is called pulmonary heart.
In frog and higher animals blood passes twice through the heart.
Once it passes through heart to lungs.
But for the second time it passes from heart to body parts.
Such a circulation is called double circuit circulation and the heart is called 'Double circuit heart'.
Q: What is agglutination of blood?
A: When the blood samples of different blood groups are mixed with each other clumps
are formed. The Clumping of blood cells is called agglutination.
Four Marks Questions
Q: What are the differences between right ventricle and left ventricle?
Right Ventricle
1. It is smaller in size.
2. Pulmonary aorta takes its origin.
3. Receives deoxygenated blood from right auricle.
4. Pumps deoxygenated blood to lungs.
5. The right auriculo ventricular aperture is guarded by the tricuspid valve.
Left Ventricle
1. It is larger in size than the right ventricle.
2. Systemic aorta takes its origin.
3. Receives oxygenated blood from left auricle.
4. Pumps oxygenated blood to all parts of the body.
5. The auricular ventricular aperture is guarded by the bicuspid valve, which is also called as mitral valve.
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