What is true for the following statements ?
Statement X : Migration of birds is influenced by light.
Statement Y : Reproduction of birds is influenced by light.
Statement Z : In all birds gonads are activated due to increase in intensity of light during summer.
X Y Z

Related MCQs

• What is true for the given statements ? Statement X : Birds and Mammals obtain greater body size in cold region than in warm regions. Statement Y : Birds and Mammals are Homeothermic (warm blooded)animals. Statement Z : Reptiles are smaller in cold region.
• According to statements find the correct option : 1. Stuart factors are activated by : IX, VIII, IV and Phospholipid 2. Intitiated factors of this system are derived from the blood plasma 3. In intrinsic pathway blood clotting stats 4. PTA is activated by XIIa
• In which type of reproduction single parent is essential for reproduction ?
• A. Mutations occurring in the germinal cells of the gonads are called germs mutations. R. They are heritable raw materials for natural selection lead to origin of new species.
• Give correct option for the given true and false statements (i) Some insects, birds and mammals living in warm and dry climate have more darker black pigments than the races of same species living in cold and humid climate. (ii) Tempreture variation is much lesser in aquatic habitat compared to terrestrial habitat (iii) In deep fresh water lakes, there is gradual incrase in tempreture from surface to the bottem (iv) In an aquatic habitat production increases with insing depth. (T =True, F = False)
• In a population, group of individuals of similar phenotypes are formed due to differential reproduction due to
• Several statements are given here in reference to cone cells which of the following option indicates all correct statements for cone cells ? Statements (i) cone cells are less sensitive than Rod cells (ii) They are responsible for colour vision (iii) Erythrolobe is photopigment which is sensitive to red colour light (iv) They are absent in fovea of retina
• Which is the correct option for the given table ?write ‘T’ if the given ecample is correct and ‘F’ for wrong example Information Example Breed only once Bamboo Breeds many time Birds like pigeon, Mammals Small sized but many offsprings Pray Birds less in number but big size offsprings Only deep marine shishes
• Intensity of light increase 20 times, rate of photosynthesis will
• A. Under conditions of high light intensity and limited CO2 supply, photorespiration has a useful role in protecting the plants from photo-oxidative damage. R. If enough CO2 is not available to utilize light energy for carboxylation to proceed, the excess energy may not cause damage to plants.