1
Cavities of brain is called:
(1)Leumen (2)Ventricles (3)Coelom (4)Auricle
2 Cell -The Unit of Life
The cristae in mitochondria have been discovered by 1) R. Altmann 2) Kollicker 3) Benda 4) G.E. Palade
3
Growth in plants at root apex and shoot apex takes place by1. basal meristem2. apical meristem3. intercalary meristem4. lateral meristem
4
Soil erosion takes place due to 1. heavy rain fall 2. over grazing by cattle 3. strong wind blow 4. none of these
5 Animal Kingdom
Identify the correct set of mammals that live wholly in water.
1) Whales,seals,dolphins
2) Seals,whales,shark
3) Hippocampus, whale, scoliodon
4) Rohu,shark,catla
Solution
In aquatic mammals, whales, seals and dolphins live completely in water.
Sharks, rohu, catla are not mammals.
So, the correct option is 'Whales, seals and dolphins'.
6
In humans, what is the ratio of the number of gametes produced from one male primary sex cell to the number of gametes produced from one female primary sex cell?
Four viable sperm cells are produced from one primary sex cell, whereby only one viable egg cell is produced, due to the unequal division of cytoplasm and the formation of polar bodies, which wither and die.
7
A pollen grain does not normally germinate until
In plant sexual reproduction, pollination (the transfer of pollen to the stigma of the pistil) occurs before the pollen grain germinates (grows) down to the ovary where the ovule (egg cell) is found. Then when the pollen grain reaches the ovule, fertilization occurs.
8 Anatomy of Flowering Plants
Collenchyma's is found in stems and petioles of : 1. Hydrophytes 2. Herbaceous climbers 3. Xerophytes 4. Lianas
Collenchyma is found in epidermis of dicot stem and petioles and abundant in climbing stems. Collenchyma occurs as hypodermis (below the epidermis) and also above the petiole in dicots providing tensile strength.
9
Gelatin, a very important raw material for preparation of photographic emulsion, is a bi-product of:
(1) Cattle (2) fish (3) forest (4) chicken
10 Environmental Issues
Lead is mainly considered
(1) Smoke and smog
(2) Air pollutant
(3) Soil pollutant
(4) Water pollutant
Lead (Pb) is most common solid pollutant of air. However, water pollution due to lead may occur near aluminium industry, smelter and battery industries.
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