Which of the following scientists started the practice of using biological names?

Which of the following is used in making litmus solution?

Which of the following is an incorrect statement?

Apical meristem is found at which of the following organs in plant?

Which of the following shows modification of stem for food storage?

Which place will have cuboidal epithelium?

Which of the following scientists proposed the cell theory?

How many essential amino acids are known?

Which is the correct sequence of mitotic cell division?

What is the name of long distance transport of materials in plants?

Which of the following micronutrients is important for pollen germination?

Which of the following procedures does not take place in a C₄ plant?

Which of the following is a product of lactic acid fermentation?

Which of the following hormones acts as growth inhibitor?

Which is the main organ of respiration in amphibians?

Which artery supplies blood to the heart muscle?

What is the main role of skin in human?

Which of the following organs have unstriated muscles?

Which of the following is true about chemical synapse?

Which of the following is not a result of action of cortisol?

How is a key helpful in the identification and classification of an organism?

How does a nucleoid differ from a nucleus?

What is the name of pigments present in Chlorophyceae?

Correctly match the column I and II. Also give the correct reason.

What is special types of inflorescence? what are its different types?Explain.

Differentiate between softwood and hardwood.

Where are tendons and sheets of white fibrous connective tissue located? What role do they play in tissue?

Do bacterial cells have nucleus like eukaryotic cell? Explain

Define protein.

Name the stage of cell cycle at which one of the following events occur:
(i) Chromosomes are moved to spindle equator.
(ii) Centromere splits and chromatids separate.
(iii) Pairing between homologous chromosomes takes place.
(iv) Crossing over between homologous chromosomes takes place

What do you understand by guttation?

Discuss any two deficiency symptoms of each
Chlorine

What are the main steps during Calvin cycle?

Glucose, malic acid, oxalic acid and tartaric acid are oxidised to give energy in plant cell. Which of the mentioned acids will give RQ of value 4 and why?

Plant growth substances (PGSs) have innumerable practical applications.Name the PGR you should use to 
promote lateral shoot growth

Which is the process which facilitates the movement of food through the alimentary canal?

How will you define lungs?

What is the significance of time gap in the passage of action potential from sinoatrial node to the ventricle?

Discuss the effects of the factor angiotensin II

What are the points of articulation for pelvic and pectoral girdles?

Are rods and cones evenly distributed over the entire surface of the retina? Why or why not?

How are the hypothalamic hormones transported to target organs?

What is the benefit of metabolism for living organisms? What are its types?

Give the name of the bacteria for following activities
dairy industry 

Classify Kingdom-Plantae into various groups.

Give a comparative account of limbs of Arthropods vis-a-vis those of Tetrapoda.

Define the term inflorescence. Explain the basis for the different types inflorescence in flowering plants.

Define cymose inflorescence.

Describe mouth parts of the cockroach.

Describe the structure of nucleolus and list the function of nuclear envelope.

What are polysaccharides?

Why is mitosis also known as an equational division?

Define following: (a) Cohesion, (b) Adhesion and (c) Surface Tension. How do these properties of water help in movement of water in plants?

What is the role of nickel in plants?

Give comparison between the C₃ leaf anatomy and C₄ leaf anatomy

Which pathway of respiration is common in all living organisms?Where does it occur inside the cell?

Explain the importance of gibberellins in plants. Write a note on their discovery.

Give a tabular representation for absorption of various substances in alimentary canal.

What happens to the oxygen dissociation curve in Tissues?

Answer the following
(i) Name the major site where RBCs are formed.
(ii) Which part of heart is responsible for initiating and maintaining its rhythmic activity?
(iii) What is specific in the heart of crocodiles among reptilians?

What is the function of collecting duct in kidneys?

The following parts in our body has specific names in osteology. Write the name for each
(i) Knee cap

Explain the mechanism of generation of light-induced impulse on the retina.

Fill up the blank spaces (i) - (vi) in the table given below

During biology class, the teacher was explaining the characteristics of living things. Abhay became confused after knowing, that all the characteristics of human beings are similar to other animals. He asked his teacher about any characteristics that is exclusively found only in human beings. The teacher smiled appreciated Abhay for his attentiveness and explained him about it.
(i)  What is the characteristic exclusively found in humans ?

On world AIDS day Ankit and his friends arranged an awareness campaign programme in their locality. Some elderly people rebuked the children and asked them not to talk of such thing in public. The children convinced the elders about the need for the programme and on understanding their point of view, they also joined the campaign.
(iii) What type of genetic material is found in AIDS virus?

Vinay was going through an industrial are with his grandfather. While on the way, he felt suffocated and dizzy due to the smoke coming out of the factory.Vinay got angry and started shouting that all these factories should be closed. his grandfather calms him down and explained that it is due to large-scale cutting of trees for urbanization and industrialization which has disturbed the balance of atmospheric gases.He also explained the various economic importance of plants.
(i) Large scale cutting of trees leads to ...?

Define the term inflorescence. Explain the basis for the different types inflorescence in flowering plants.

Teacher was teaching the mechanism of absorption of water in plants or any other solid particles. Akhil when reached home, saw that his mother was complaining his father about the difficulty in closing doors during rainy season. Akhil explained his parents that it is due to the phenomenon of imbibition.
  What do you understand by the term imbibition?

Draw a standard ECG and explain the different segments in it.

Avantika, who works in a publication houses suffered from severe back pain, for the last three months. She visited a doctor, who explained that it was due to her wrong sitting posture during the office hours. He also suggested her that she should avoid long working hours continuously.
Write the vertebral formula of humans.

A man is admitted to a hospital. He is suffering from an abnormal low body temperature, loss of apeptite and extreme thirst. The doctor consoled him and also prescribed brain scan as he suspected, there would be a tumour in his brain.
(i) Mention the reason behind the abnormalities of the patient.
(ii) Which part of the brain would probably show a tumour?
(iii) Identify the location of hypothalamus.
(iv) what values of life were reflected by the doctor?

List the hormones secreted by the following:
(a) Hypothalamus
(b) Pituitary
(c) Thyroid
(d) Parathyroid
(e) Adrenal
(f) Pancreas
(g) Testis
(h) Ovary
(i) Thymus
(j) Atrium
(k) Kidney
(l) G-I Tract

Discuss metabolism in relation to growth of the body.

Name the following
(ii) Edible Basidiomycetes

Describe briefly the life cycle of pteridophytes.

How do birds and mammals resemble?

What is meant by modification of root? What type of modification of root is found in the:
(a) Banyan tree
(b) Turnip
(c) Mangrove trees

Describe the internal structure of a dorsiventral leaf with the help of a labelled diagram.

In which segment does the following structures lies in the earthworm's body?
Intestine

Describe cilia and flagella of eukaryotic cell. How are flagella of eukaryotes different from those of prokaryotic cell?

Find and write down structures of 10 interesting small molecular weight biomolecules. Find if there is any industry which manufactures the compounds by isolation. Find out who are the buyers.

Explain cytokinesis. Also with the help of diagram write about cytokinesis in plant cell and animal cell.

In what way did the concept of water potential help in explaining water movement?

It is observed that deficiency of particular element shows its symptoms initially in order leaves and then in younger leaves.
Does it indicate that the element is actively mobilised or relatively immobile? 

What are special anatomical features displayed by leaves of C₄ -plants? How do they provide an advantage over the structure of C₃ -plants?

Define the following
Name the major respiratory substrates used by most organism.It unavailable at time,what other substances can be used for respiration?

Write Short Notes on Ethylene

Distinguish between
Peptic and oxyntic cells

Explain the structure of human respiratory system with the help of suitable diagram.

How circulation of blood takes place through special regions? 
Explain.

cbse-11-che-bio-c19-pno497-qno10

Which bones have become modified to form ear ossicles?

Explain the following processes
(i) Polarisation of the membarance of a nerve fibre
(ii) Depolarisation of the memberance of a nerve fibre
(iii) Conduction of a nerve impulse along a nerve fibre
(iv) Transmission of a nerve impulse across a chemical synapse

Give scientific reason of the following statements
Parathormone is also called collip's hormone.