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Egg is covered by a tough sheet of tissue that protects it from desiccation and infection by pathogens. But the same tissue also prevents sperm nuclei from encountering the egg nuclei. However, a part of sperm is known to release enzymes that digest this tough sheet. What part of sperm is it?
Which of the following statements is/are correct? 1. A fuse wire is made of 37% lead and 63% tin 2. A fuse wire is made of 63% lead and 37% tin 3. A fuse wire has high resistance and low melting point 4. A fuse wire has low resistance and high melting point
On what factors does the current carrying capacity of a fuse depend? I) Size of fuse wire II) Fuse material III) Surrounding of the fuse Choose the correct answer from the options given below.
Which of the following statements refers to the process of 'parthenogenesis'? 1. It is a natural form of asexual reproduction in which the growth and development of embryos occur without fertilisation. 2. It is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. 3. It is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg inside of the female's body  Select the correct answer using the codes given below.
Consider the following statements regarding double fertilization and choose the correct answer:
1. At the time of the sperm's approach to the egg nucleus, the male nucleus has the appearance of a continuous thread rolled into a ball
2. It is only the presence of the two nucleoli which serves to distinguish the fertilized egg from the unfertilized egg
3. Finally, the male nucleolus increases in size and fuses with the female nucleolus thus closing the phenomenon of sexual union of the nuclei
4. The fusion of the male gamete with the secondary nucleus results in the formation of a sister embryo
A dealer offers sells half of the eggs that he has and another half an egg to Anurag. Then he sells half of the balance eggs and another half an egg to Deepak. Then he sells half of the balance eggs and another half an egg to Sivani. In the end he is left with just 7 eggs and he claims that he never broke an egg. How many eggs did he start with?
Rakesh and Reshma have difficulty conceiving a baby. They consulted a sex therapist. Sperm count of Rakesh was normal but the doctor observed that the motility of his sperm was less. What part of sperm do you think has the issue?
Which of the following/s is not a property of fuse  1) The conductivity of the fuse wire must be high 2) The melting point of the fuse is high 3) It is a protective equipment 4) It can be made up of an alloy of lead & tin
Which of the following statement(s) is/are TRUE? I. Fuse is generally placed in series with the device. II. Fuse is generally placed in parallel with the device. III. Fuse wire has a high melting point.
Sperm and egg nuclei fuse due to