Read the following statements and choose the correct option.
(i) Light is essential for life to exist on the earth.
(ii) Many species of small plants under the canopy to tall trees in forest show optimal use of available light due to having large sized antenna and higher number of thylakoids.
(iii) UV rays are not harmful to many organisms.
(iv) Photoperiodic requirement is essential for many plants for flowering.
(v) Red algae can live in deeper water of sea because of having pigment, phycoerythrin.

(i) and (iii)

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(i), (iii) and (iv)

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Only (iii)

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(i), (ii), (iv) and (v)

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Solution

The correct option is D (i), (ii), (iv) and (v)
An overexposure to UV-B radiation can cause sunburn and some form of skin cancer. In humans, prolonged exposure to solar UV-radiation may result in acute and chronic health effects on the skin, eye and immune system. Moreover, UV-C can cause adverse effects that can variously be mutagenic or carcinogenic.

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Similar questions

Q. Read the following statements and select the correct ones.
(i) All the color components of the visible spectrum are available for marine plants living in different depths of the ocean.
(ii) Many herbs and shrubs in rain forests adapt to photosynthesis optimally under very low light conditions as they grow under canopy trees.
(iii) Gradual increasing in average global temperature will affect the distributional range of some species.
(iv) The quality of sol does not depend upon the weathering process.

Question 8
Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere in harvesting.
(ii) They help crop plants to grow healthily.
(iii) They compete with crop plants for water, nutrients, space and light.
(iv) They affect plant growth.

Choose the correct combination of statements.
(a) i, iii, iv
(b) iii only
(c) iii, iv
(d) i, ii, iii, iv

Q. Read the following statements (I - IV) related to the medicinal importance of plants and identify how many of the following statements are correct?

I. Plants account for less than 25% of the drugs currently sold in the market.
II. 45000 species of plants contribute to the production of traditional medicines.
III. Reserpine is a drug isolated from Cinchona tree bark that is used for its antihypertensive properties.
IV. Bioprospecting involves exploring molecular, genetic and species-level diversity for products of economic importance.

Read the following statements I and II.

I. Many organs of aquatic plants float in water.

II. Large air gaps are present in the collenchyma tissues of lotus leaf.

Q. Choose the correct statements:

(i) Excessive use of chemicals in agriculture is toxic to many plant and animal species.
(ii) Excessive use of chemical fertilisers can cause environmental pollution.
(iii) Chemical fertilisers are used in agriculture to increase the quantity of harvest.

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