Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss?
1. Hard and waxy leaves
2. Tiny leaves or no leaves
3. Thorns instead of leaves
Select the correct answer using the codes given below.
Which of the following statements is/are correct?
1. Viruses lack enzymes necessary for the generation of energy.
2. Viruses can be cultured in any synthetic medium.
3. Viruses are transmitted from one organism to another by biological vectors only.
Many transplanted seedlings do not grow because
Rainbow is produced when sunlight falls on drops of rain. Which of thefollowing physical phenomena are responsible for this?
1. Dispersion
2. Refraction
3. Internal reflection
Consider the following phenomena
1. Size of the sum at dusk
2. Colure of the sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?ppppppp
Ball bearings are used in bicycles, cars, etc., because