In case the ovum (female) fertilises with a sperm (male) carrying X-chromosome the zygote develops into a female (XX) and the fertilisation of ovum with Y-chromosome carrying sperm results into a male offspring (XY). Thus, it is evident that it is the genetic makeup of the sperm (male/father) that determines the sex of the child.

Correct Option: B

In case the ovum (female) fertilises with a sperm (male) carrying X-chromosome the zygote develops into a female (XX) and the fertilisation of ovum with Y-chromosome carrying sperm results into a male offspring (XY). Thus, it is evident that it is the genetic makeup of the sperm (male/father) that determines the sex of the child.

120 days

Correct Option: C

120 days

Mostly dicotyledonous plants exhibit an increase in girth called the secondary growth. The tissues involved in secondary growth are the two lateral meristems : vascular cambium and cork cambium.

Correct Option: C

Mostly dicotyledonous plants exhibit an increase in girth called the secondary growth. The tissues involved in secondary growth are the two lateral meristems : vascular cambium and cork cambium.

7.4

Correct Option: A

7.4

Thromboplastin is a plasma protein aiding blood coagulatin through conversion of prothrombin to thrombin.

Correct Option: D

Thromboplastin is a plasma protein aiding blood coagulation through conversion of prothrombin to thrombin.