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Which one of the following is living but non-nucleated?

(a) What is an ecosystem? List its two main components.

(b) We do not clean ponds or lakes, but an aquarium needs to be cleaned regularly. Explain.

Which of the following is not grown by transplantation ?

(a) chillies (b) tomatoes (c) peas (d) paddy

What is the fate of an unfertilized egg?

In gymnosperms, the seeds are naked because they lack_____

How does the development of embryo take place?

which of the following microorgansm reproduce only inside the cell of the of the host organism

________ lives in both aquatic and terrestrial habitat during course of its life.

In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the ship is 28 m, how long is the model ship?

Which of the following are greenhouse gases?

a. CO₂

b. Water vapour

c. Oxygen

d. Methane

e. Nitrogen

f. Nitrous oxide

What is symbiotic nutrition? Give one example of it.

Answer the following questions.

(a) What is meant by epidemic diseases?

(b) What is meant by communicable diseases?

(c) Why should a person suffering from tuberculosis avoid going to public places?

Which chemical process used catalysts centuries ago without even knowing about it?

Puberty refers to the bodily changes, whereas _______ is the period of transition between childhood and adulthood.

Question 20

Figure 17.1 shows a part of a forest

Write any three activities going on in the forest on the basis of this figure.

What is the colour of cell

Question 9

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the



(a) food web

(b) ecological pyramid

(c) ecosystem

(d) food chain

Which among the following is/are example(s) of abiotic components?

In a reflex arc, ______________ connects different neurons together and sends the signal from one neuron to another.

The process in which forests are converted into pastures, then into arid land and finally into deserts is known as:

I am a comma-shaped, bacterial pathogen which spreads through contaminated water and food. I cause severe diarrhoea and water loss in the infected person. If not properly treated the infected person can be dehydrated. Who am I?

In the given figure, the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?

The graph between intensity of light $\left(I\right)$ falling on a metallic plate and the photocurrent $\left(\text{i}\right)$ generated is

Why is earthworm called nature's plough men?

Find the odd one out with respect to haplontic life cycle.

Which of the following is/are true about ABO blood antigens?

1. They are present on the mitochondrial surface of WBCs.

2. They are found free-floating in the cytoplasm of WBCs.

3. They are present on the surface of RBCs.

4. They are present in the nucleus of RBCs.

Industrialization has increased the problem of

Question 4

What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?

What are cerebrovascular diseases?

Which of the following is/are true about asexual reproduction in plants?

I: It does not require seeds

II: It takes place in flowers

III: Spore formation is an example of it

IV: It requires two plants for the process