1.4.13 The enzyme in sperm cell that facilitates penetration Into the ovurn is called the testosterone. 1.4.14 Flushing is the implantation of an already fertilised egg cell from a superior animal into a recipient animal. 1.4.15 Twin lambs developing from a single zygote, are referred to as freematin 1.4.16 The gestation period in dairy cattle refers to the period between two lactations. 1.4.17 Dolly, the famous sheep, produced seven identical lambs through the process of genetic modification. .4.18 A spermatozoon is the end product of the process of oogenesis. 4.19 Transplantation is a technique used on female animals to make them come int heat approximately at the same time.

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1.4.13  
- The statement claims that the enzyme in the sperm cell that facilitates penetration into the ovum is called testosterone.  
- In reality, the enzyme involved in digesting the zona pellucida (the outer covering of the ovum) is linked to the acrosome; the main enzyme is known as $$	ext{acrosin}$$ (or may include hyaluronidase activity), not testosterone.  
- $$\boxed{	ext{False}}$$

1.4.14  
- The statement defines flushing as the implantation of a fertilised egg cell from a superior animal into a recipient animal.  
- In reproductive biotechnology, flushing refers to the process of recovering oocytes (or embryos) from the reproductive tract. Implantation of embryos into a recipient is termed embryo transfer, not flushing.  
- $$\boxed{	ext{False}}$$

1.4.15  
- The statement describes twin lambs developing from a single zygote as “freematin”.  
- Twin offspring that develop from a single zygote are called monozygotic twins. The term “freemartin” is used in cattle to describe a sterile female twin born with a male co-twin due to vascular anastomoses; it is not applicable to lambs.  
- $$\boxed{	ext{False}}$$

1.4.16  
- The statement indicates that the gestation period in dairy cattle refers to the period between two lactations.  
- The gestation period is defined as the time from conception to birth (parturition), not the interval between lactations.  
- $$\boxed{	ext{False}}$$

1.4.17  
- The statement claims that Dolly, the famous sheep, produced seven identical lambs through the process of genetic modification.  
- Dolly was the first cloned sheep, produced by somatic cell nuclear transfer. She was not a result of genetic modification, nor did she produce seven identical lambs.  
- $$\boxed{	ext{False}}$$

1.4.18  
- The statement asserts that a spermatozoon is the end product of the process of oogenesis.  
- Oogenesis is the process of formation of ova (egg cells) in females, whereas a spermatozoon is produced by spermatogenesis in males.  
- $$\boxed{	ext{False}}$$

4.19  
- The statement describes transplantation as a technique used on female animals to make them come into heat approximately at the same time.  
- The technique to synchronize estrus (heat) in female animals is generally achieved using hormonal treatments, not transplantation.  
- $$\boxed{	ext{False}}$$
1.4.13 - The enzyme in sperm cells that helps penetrate the ovum is not testosterone. - **False** 1.4.14 - Flushing refers to recovering oocytes, not implanting embryos. - **False** 1.4.15 - Twin lambs from a single zygote are called monozygotic twins, not freematin. - **False** 1.4.16 - Gestation period is from conception to birth, not between lactations. - **False** 1.4.17 - Dolly was cloned through nuclear transfer, not genetic modification, and did not produce seven lambs. - **False** 1.4.18 - A spermatozoon is produced by spermatogenesis, not oogenesis. - **False** 4.19 - Synchronizing estrus in females is done with hormones, not transplantation. - **False**

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