91. Double fertilization is exhibited by

(1) Gymnosperms

(2) Algae

(3) Fungi

(4) Angiosperms

Answer (4)

Sol. Double fertilization is a characteristic feature exhibited by angiosperms. It involves syngamy and triple fusion.

92. Which of the following are found in extreme saline conditions?

(1) Archaebacteria

(2) Eubacteria

(3) Cyanobacteria

(4) Mycobacteria

Answer (1)

Sol. Archaebacteria are able to survive in harsh conditions because of branched lipid chain in cell membrane which reduces fluidity of cell membrane. Halophiles are exclusively found in saline habitats.

93. Select the mismatch :

(1) Frankia – Alnus

(2) Rhodospirillum – Mycorrhiza

(3) Anabaena – Nitrogen fixer

(4) Rhizobium – Alfalfa

Answer (2)

Sol. Rhodospirillum is anaerobic, free living nitrogen fixer.

Mycorrhiza is a symbiotic relationship between fungi and roots of higher plants.

94. What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?

(1) The larger the fragment size, the farther it moves

(2) The smaller the fragment size, the farther it moves

(3) Positively charged fragments move to farther end

(4) Negatively charged fragments do not move

Answer (2)

Sol. During gel electrophoresis, DNA fragments separate (resolve) according to their size through sieving effect provided by agarose gel.

95. Attractants and rewards are required for

(1) Anemophily

(2) Entomophily

(3) Hydrophily

(4) Cleistogamy

Answer (2)

Sol. Insect pollinated plants provide rewards as edible pollen grain and nectar as usual rewards. While some plants also provide safe place for deposition of eggs.

96. Which of the following is made up of dead cells?

(1) Xylem par enchyma

(2) Collenchyma

(3) Phellem

(4) Phloem

Answer (3)

Sol. Cork cambium undergoes periclinal division and cuts off thick walled suberised dead cork cells towards outside and it cuts off thin walled living cells i.e., phelloderm on inner side.

97. Which cells of ‘Crypts of Lieberkuhn’ secrete antibacterial lysozyme?

(1) Argentaffin cells

(2) Paneth cells

(3) Zymogen cells

(4) Kupffer cells

Answer (2)

Sol. – Kupffer-cells are phagocytic cells of liver.

– Zymogen cells are enzyme producing cells.

– Paneth cell secretes lysozyme which acts as anti-bacterial agent.

– Argentaffin cells are hormone producing cells.

98. Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?

(a) They do not need to reproduce

(b) They are somatic cells

(c) They do not metabolize

(d) All their internal space is available for oxygen transport

(1) Only (d)

(2) Only (a)

(3) (a), (c) and (d)

(4) (b) and (c)

Answer (1)

Sol. In Human RBCs, nucleus degenerates during maturation which provide more space for oxygen carrying pigment (Haemoglobin). It lacks most of the cell organelles including mitochondria so respires anaerobically.

99. The Hepatic Portal Vein drains blood to liver from

(1) Heart

(2) Stomach

(3) Kidneys

(4) Intestine

Answer (4)

Sol. In hepatic portal system, hepatic portal vein carries maximum amount of nutrients from intestine to liver.

100. The final proof for DNA as the genetic material came from the experiments of

(1) Griffith

(2) Hershey and Chase

(3) Avery, Mcleod and McCarty

(4) Hargobind Khorana

Answer (2)

Sol. Hershey and Chase gave unequivocal proof which ended the debate between protein and DNA as genetic material.

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