For keeping the stomata open a constant expenditure of energy is required. This is provided by the conversion of starch to sugar. The stomatal opening is, in turn, related to transpiration which is the evaporation of water from plants. It occurs chiefly at the leaves while their stomata are open for the passage of CO₂ and O₂ during photosynthesis.

Correct Option: A

For keeping the stomata open a constant expenditure of energy is required. This is provided by the conversion of starch to sugar. The stomatal opening is, in turn, related to transpiration which is the evaporation of water from plants. It occurs chiefly at the leaves while their stomata are open for the passage of CO₂ and O₂ during photosynthesis.

Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.

Correct Option: C

Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.

Use of the reverse transcriptase enzyme is a unique characteristic of retroviruses such as HIV. After the virus releases its genetic material into a host cell, reverse transcriptase converts the viral RNA into a complementary piece of DNA. This process is known as ‘reverse transcription’.

Correct Option: A

Use of the reverse transcriptase enzyme is a unique characteristic of retroviruses such as HIV. After the virus releases its genetic material into a host cell, reverse transcriptase converts the viral RNA into a complementary piece of DNA. This process is known as ‘reverse transcription’.

Myrmecology is the scientific study of ants, a branch of entomology. The word myrmecology was coined by William Morton Wheeler (1865–1937), although human interest in the life of ants goes back further, with numerous ancient folk references.

Correct Option: B

Myrmecology is the scientific study of ants, a branch of entomology. The word myrmecology was coined by William Morton Wheeler (1865–1937), although human interest in the life of ants goes back further, with numerous ancient folk references.

Julius Caesar is commonly believed to have been born due to operative procedure from his mother Aurelia. It is from his name that the word ‘Caesarean section’ is derived. It is a surgical procedure in which one or more incisions are made through a mother’s abdomen and uterus to deliver baby.

Correct Option: A

Julius Caesar is commonly believed to have been born due to operative procedure from his mother Aurelia. It is from his name that the word ‘Caesarean section’ is derived. It is a surgical procedure in which one or more incisions are made through a mother’s abdomen and uterus to deliver baby.