Class 12 | Biology | chapter 9 | Strategies For Enhancement in Food Production

Consider the following four statements (i – iv) and select the option which includes all the correct ones only. (i) Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins, etc. (ii) Body weight-wise, the micro-organism Methylophilus methylotrophus may be able to produce several times more proteins than the cows per day. (iii) Common button mushrooms are a very rich source of vitamin C. (iv) A rice variety has been developed which is very rich in calcium.

Ruhul Amin Alig

Class 11 | Biology | Chapter 22| CHEMICAL COORDINATION AND INTEGRATION

A person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly? (a) Thyroid (b) Parathyroid (c) Parotid (d) Pancreas

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Class 11 | Biology | Chapter 22| CHEMICAL COORDINATION AND INTEGRATION

Match the endocrine gland as a source with its respective hormone as well as the function

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Class 11 | Biology | Chapter 22| CHEMICAL COORDINATION AND INTEGRATION

Assertion : Hormone calcitonin has an antagonistic effect to that of parathormone. Reason : Calcitonin decreases blood calcium level while parathormone increases blood calcium level.

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Class 11 | Biology | Chapter 22| CHEMICAL COORDINATION AND INTEGRATION

Which one of the following is not a second messenger in hormone action ? (a) Calcium (b) Sodium (c) cAMP (d) cGMP

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Class 11 | Biology | Chapter 21 | Neural Control and Coordination

Which of the following events is involved in the transfer of information across a chemical synapse? (i) Neurotransmitters bind to the postsynaptic receptors. (ii) Calcium channels open in the presynaptic region. (iii) Ion channels open in the postsynaptic membrane. (iv) Direct flow of ions from one neuron to the next.

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Class 11 | Biology | Chapter 20 | Locomotion and Movement

Given below are some events which occur during muscle contraction.Select the correct events which occur during muscle contraction.

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Class 11 | Biology | Chapter 20 | Locomotion and Movement

Which of the following is the store house of calcium in muscles? (a) Sarcosome (b) Sarcoplasmic reticulum (c) Creatine phosphate (d) Sarcomere

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Zinc

Which of the following is an incorrect match of essential element and function? (a) Manganese - Structural component of chlorophyll. (b) Calcium - Component of the middle lamella. (c) Zinc - Enzyme activator. (d) Iron - Component of ferredoxin

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Manganese

Which of the following statements are correct? (i) Magnesium competes with iron and manganese for uptake and with iron for binding with enzymes. (ii) Magnesium inhibit calcium translocation in shoot apex. (iii) Excess of manganese may induce deficiencies of iron, magnesium and calcium. (iv) Symptoms of manganese toxicity may actually be the deficiency symptoms of iron, magnesium and calcium.

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cobalt

Which of the following compound is used to study water loss from a leaf and turns colour on absorbing water? (a) Calcium chloride (b) Magnesium chloride (c) Cobalt chloride (d) Sodium chloride

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Class 11 | Biology | chapter 11 | Transport in Plants

The following statements are associated with translocation of mineral ions. (i) Mineral ions are slowly remobilised. (ii) Younger leaves export most of their minerals content to older leaves. (iii) Elements most readily mobilised are P, S, N and K. (iv) Some elements that are structural components like calcium are not remobilised. Which of the above statements are correct?

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Class 12 | Biology | chapter 11 | Biotechnology: Principles and Processes

Calcium : Case study from NCERT for NEET

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Class 12 | Biology | chapter 11 | Biotechnology: Principles and Processes

To transform a bacterial cell with recombinant DNA, which of the following is required? (1) 90°C temperature (2) Divalent calcium ions (3) Selectable marker (4) Restriction enzyme digested DNA

Ruhul Amin Alig