Solution of Chapter 25. Model Question Paper (Biology - Exemplar Book)

The term ‘systematics’ refers to:

Venation is a term used to describe the pattern of arrangement of:

Interfascicular cambium and cork cambium are formed due to

Which one of the following is not a connective tissue?

Which of the following statements is true for a secretory cell?

Many organic substances are negatively charged e.g., acetic acid, while others are positively charged e.g., ammonium ion; an amino acid under certain conditions would have both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called:

Mark the correct event during anaphase-I of meiosis

The form of sugar transported through phloem is

Reactions carried out by N₂ fixing microbes include

a.

b.

Which of the following statements about these equations is not true?

PEP is primary CO₂ acceptor in

Glycogen is a homopolymer made of

One of the common symptoms observed in people infected with Dengue fever is:

Which one of the following statements is incorrect?

Mary is about to face an interview. But during the first five minutes before the interview she experiences sweating, increased rate of heart beat, respiration etc. Which hormone is responsible for her restlessness?

Suppose you accidentally find an old preserved permanent slide without a label. In your effort to identify it, you place the slide under microscope and observe the following features :-

a. Unicellular

b. Well defined nucleus

c. Biflagellate–one flagellum lying longitudinally and the other transversely. What would you identify it as? Can you name the kingdom it belongs to?

Identify the phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry.

Identify the sex of a frog in which sound producing vocal sacs are present.

What is the feature of a metacentric chromosome?

Reaction given below is catalysed by oxidoreductase between two substrates A and A’, complete the reaction.

A reduced + A’ oxidized →

A flowering plant is planted in an earthen pot and irrigated. Urea is added to make the plant grow faster, but after some time the plant dies. Give reason.

Identify the process occurring in II and III

Where is NADP reductase enzyme located in the chloroplast? What is the role of this enzyme in proton gradient development?

Cigarette smoking causes emphysema. Suggest reasons.

Arrange the following in the order of reception and transmission of sound wave from the external auditory canal:

Cochlear nerve, ear drum, stapes, incus, malleus, cochlea.

The heterosporous pteridophytes show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain.

The following events occur during the various phases of the cell cycle, Write the phase against each of the events.

a. Appearance of nucleolus _________________________

b. Division of centromere _________________________

c. Replication of DNA _________________________

How is sulphur important for plants? Name on amino acids in which it is present.

What is the mechanism underlying the phenomenon by which the terminal/apical bud suppresses the growth of lateral buds? Suggest measures to overcome this phenomenon.

While eating peach or pear it is usually seen that some stone like structures get entangled in the teeth, what are these stone like structures called?

Succulents are known to keep their stomata closed during the day to check transpiration. How do they meet their photosynthetic CO₂ requirements?

How are the activities of gastro-intestinal tract regulated?

The arrangement of ovules within the ovary is known as placentation. What does the term placenta refer to? Name the different types of placentation seen in plants. Draw any three types of placentation in flowers as seen in T.S.

Give the biochemical events occurring in the root nodule of a pulse plant. What is the end product? What is its fate?

OR

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves.

a. Does it indicate that the element is actively mobilized or relatively immobile?

b. Name two elements which are highly mobile and two which are relatively immobile.

c. How is the aspect of mobility of elements important to horticulture and agriculture?

Discuss the role of Ca2+ ions in muscle contraction. Draw neat sketches to illustrate your answer.

OR

A milkman is very upset one morning as his cow refuses to give any milk. The milkman’s wife gets the calf from the shed. On fondling by the calf, the milkman got sufficient milk. Describe the role of endocrine gland and hormone associated with this response with suitable diagram.