Presence of endomembrane system is peculiar structural property of eukaryotic cells as it is absent from the prokaryotic cells. Discuss the following questions:
(b) Why these components are considered as an endomembrane system?

Presence of endomembrane system is peculiar structural property of eukaryotic cells as it is absent from the prokaryotic cells. Discuss the following questions: (a) What are components of endomembrane systemof eukaryotic cell?

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons: (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? (b) What would have been the minimum number of ovules present in the ovary? (c) How many megaspore mother cells were involved? (d) What is the minimum number of microspore mother cells involved in the above case? (e) How many male gametes were involved in this case?

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: Euglena is a plant due to presence of chlorophyll. Reason: Euglena cannot be classified on the basis of two kingdom system.

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: Vessels are made up of row of cells placed one aboe the another with their intervening walls (septa) absent due to dissolution. Reason. Sieve tubes are tubular channels. In tracheids walls are thick.

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: After drinking, alcohol is changed to glucose in liver. Reason: Liver cells are able to form glucose from alcohol by reverse fermentation.

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: The film which appears bright in reflected system will appear dark in transmitted system and vice versa. Reason:The conditions for a film to appear dark or bright in reflected system is just reverse to those in the transmitted system.

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: In a photoemissive cell, inert gas is used. Reason: Inert gas in photoemissive cell gives greater current.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : (a) Trace the development of megaspore mother cell upto formation of a mature embryo sac in a flowering plant. (b) Draw a labelled diagram of the structure of mature dicot embryo.