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Name any three waterborne diseases.

The purplish red pigment rhodopsin contained in the rod type of photoreceptor cells of the human eye is a derivative of

If testa is removed from water soaked gram seed, the remaining structure is ___.

The length of the pollen tube depends on the distance between :
(a) pollen grain and the upper surface of the stigma
(b) pollen grain on the upper surface of stigma and ovule
(c) pollen grain in anther and the upper surface of the stigma
(d) the upper surface of stigma and lower part of the style

Which of the following is the mode of reproduction in hydra?

Multiparous is a condition where the woman has

Differentiate between members of each of the following pairs with reference to what is asked in brackets.
(a) Myopia and hyperopia (Cause of the defect)
(b) Rods and cones (Sensitivity)
(c) Semi-circular canal and cochlea (Function)
(d) Rod and cone cells (Pigment contained)
(e) Dynamic balance and static balance (Definition)

Define the following terms :

(a) Ultrafiltration

(b) Micturition

(c) Renal Pelvis

(d) Urea

(e) Osmoregulation

Identify the false statements and rewrite them correctly by changing the first or the last word only.

(a) Dark reaction of photosynthesis occurs during night time.

(b) Immediate product of photosynthesis is glucose.

(c) Starch produced in a leaf remains stored in in for 2-3 weeks before it is used by other parts of the plant.

(d) Photosynthesis requires enzymes.

(e) Green plants are consumers.

(f) Photosynthesis results in loss of dry weight of the plants.

(g) Photosynthesis stops at a temperature of about ${35}^{\circ }$C.

(h) Photosynthesis occurs only in cells containing chloroplasts.

(i) Green plants perform photosynthesis.

(j) Algae are autotrophs.

Which of the following is not true about the heart valves?

The plant capable of producing white flowers consists of more red flowers in number over white flowers. It indicates that

Who first studied the shape of the DNA molecule?

3.(a)Oxygenated and Deoxygenated blood is seperate in the heart of Mammals .Give reaseon.

Which pigment reflects green light and absorbs the other colors of light to provide energy for photosynthesis?

The layer of the skin that provides protection against bacteria, as well as chemical and mechanical injuries, is the

Milk secretion and milk ejection is stimulated by ........................ and ....................... respectively.

Cell shape and size remain the same when the solution outside is

DNA fingerprinting has become a familiar forensic tool and has been cited in criminal trials. It is possible to do DNA fingerprinting with even a very minute sample of DNA because___________

How do yeast and fungi obtain their nutrition?

When the water content of soil is low, the rate of transpiration__________.

What is the difference between movements in plants and movements in animals?

Can a diabetics person donate his/her eyes?

Brain is protected by_____________.

The (1)__ is the most important structure that acts as a relay between the body and the brain. It extends from (2)__ to the lower backbone. It has (3)__ matter in inner surface and (4)__ matter in the periphery.

define law of segregation and law of independent assortment in simple language

Which of the following nerves is purely a motor nerve?

The diagram shows the human excretory system.

What is the function of X?

Thin cytoplasmic projections of the cyton.

Enter 1 word only

Which of the following sources release particulate pollutants?

The recessive genes located on the X-chromosome of humans are always

What is the structure joining the two sister chromatids called?

Enter 1 word only.

Which of the following represented the first man like ancestor?

Protective sheath present around the axons that prevents impulses from jumping across neurons.

Note the relationship between the first two word and suggest the suitable word/words for the fourth place:
(a) Lub: atrioventricular valves:: Dup:
(b) Coronary artery: Heart:: Hepatic artery:

The process complementary to respiration is __.

Fill in the following blanks with suitable words :
(a) The organs of respiration in man are the___
(b) The actual exchange of gases takes place in the___ of the lungs.
(c)___ in the lungs provide a very large surface area for gaseous exchange.
(d) Yeast undergoes___ respiration whereas Amoeba undergoes___ respiration.
(e) Gills are the breathing organs in___

(a) What is meant by 'heredity' ? What are the units of heredity.

(b) State Mendel's first law of inheritance.

The fluid matrix of blood is called as ___________.

Name the type of water (present in the soil) which can be absorbed by plants.