XII Botany

SECTION “A” – (MCQs – Multiple Choice Questions)

Q.1. Choose the correct answers.

i. This one is sexual reproduction.

• Apomixis
• Anisogamy
• Sporulation
• Tissue Culture

ii. In a DNA duplex, cytosine alway pairs with

• Thymine
• Adonine
• Guanine
• Uracil

iii. The lowest level of biological organization is

• Ecosystem
• Community
• Habitat
• Population

iv. Thigmotropism is caused by

• Light
• Temperature
• Touch
• Gravity

v. The sclereids cells are type of

• Parenchyma
• Collenchyma
• Xylem
• Sclerenchyma

vi. Highly condensed portion of chromatin are called

• Euchromatin
• Heterochromatin
• Both of these
• None of these

vii. Which of the following may be considered as hereditary disease

• Cholera
• Cancer
• Photolight
• Diabetes

viii. Genetic Marerial is considered as

• RNA
• Nucleus
• Ribosomes
• DNA

ix. The chromosomes number in man is

• RNA
• Nucleus
• Ribosomes
• DNA

x. Blood Group is also known as Universal donor

• A
• B
• O
• None of them

xi. Intercallary Menistem occus at

• Bare of Internode
• Below the Node
• Bone of Internode and Below the node
• None of them

xii. The secondary growth in stem is caused due to activity of

• Cambium
• Phellogen
• Cambium and pith
• Pith

xiii. Plants glowing in shades are termed

• Hydro phyles
• Halophyles
• Mesophytes
• Xerophytes

xiv.The producer of a pond Ecosystem is

• Bacteria
• Zoo planktpon
• Phytoplankton
• Fungi

xv. Proteins of Complex Molecules of

• Carbohydrates
• Amino acids
• Enzyme
• None of them

SECTION “B” – (Short Answer Questions)

Q.2. (i) What is Test Cross? What is it performed?

ii. What is pollination? Describe the Role of pollentube in fertilization?

iii. Differentiate between the following

• Mitosis and Meiosis
• Multiple Allele and Alleles
• Racemose and cymose infloresence
• Photosynthesis and Respiration
• Photoperiodism and Vernalization

iv. Write short note on the following

• Sickle cell anaemia
• Genetic Code
• Growth correlations
• Calvin cycle
• Corni ferous forests
• Osmoregulations

v. Describe in detail the chromosomal Abberation?

vi. What do you mean by gametophyte?

vii. What are first and second lines of defence of plants against pathogens?

viii. How and when does Meiotic error take place?

ix. Arrangement of chromosomes of an individual?

x. Define linkage and crossing over?

xi. Describe the significance of secondary growth?

xii. Describe Parasitism and symbiosis with examples?

xiii. What are the reasons for the damage of DNA?

xiv. Define ecological level of Organization?

xv. Write the internal and external factories affecting the rate of transpiration?

xvi. Write about apoptosis?

SECTION “C” – (Detailed Answer Questions)

Q.3. How did Griffith? Harshay and chase proved that DNA is a genetic material?

Q.4. What are phytohormones? Describe in detail the role of five kinds of plant hormones?

Q.5. How is sex determined. Explain sex linkage in dorsophila?

Q.6. What do you mean by Biomes? Name different Biomes of the world?

Q.7. Discuss Darwin’s Theory of Natural selection?

Q.8. Describe Paratonic Movements in plants?